Combustion Instability

Clark, C., Torres Hernandez, C., Markle, S., Colborn, J., O’Connor, J. (2024) “Effect of centerbody temperature on blowoff limits of a swirl-stabilized flame.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Rodriguez Camacho, J., O’Connor, J. (2024) “Effect of diluents on flame stability in constant flame speed mixtures for piloted, swirl-stabilized flames.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Rivera, I., Birkbeck, C., Torres Hernandez, C., Subasic, N., Karmarkar, A. , Rodriguez Camacho, J., O’Connor, J. (2024), “Swirl number effects on the blowoff limits of swirl-stabilized flames.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Birkbeck, C., Rivera, I., Torres Hernandez, C., Rodriguez Camacho, J., O’Connor, J. (2024) “The effect of centerbody geometry on lean blowoff in a swirl-stabilized flame.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Rodriguez Camacho, J., Akiki, M., Blust, J., & O’Connor, J. (2024). “Effect of inert species on the static and dynamic stability of a piloted, swirl-stabilized flame.” Journal of Engineering for Gas Turbines and Power. 146(6), p. 061021. Author accepted pre-print available here.

Karmarkar, A., & O’Connor, J. (2023). “Impact of turbulence on the coherent heat release response of acoustically excited rod-stabilized flames.” ASME Turbo Expo. Author accepted pre-print available here.

O’Connor, J. (2022) “The Role of Hydrodynamic Instability in Thermoacoustic Oscillations in Gas Turbine Combustors,” Proceedings of the Combustion Institute, 39(4), p. 4583-4610. Author accepted pre-print available here.

Karmarkar, A., O’Connor, J. (2022) “Impact of turbulence on flame brush development of acoustically excited rod-stabilized flames,” Proceedings of the Combustion Institute, 39(2), p. 2139-2148. Author accepted pre-print available here.

Karmarkar, A., Gupta, S., Boxx, I., Hemchandra, S., O’Connor, J. (2022) “Impact of precessing vortex core dynamics on the thermoacoustic instabilities in a swirl stabilized combustor.” Journal of Fluid Mechanics, 946: p. A36 (open access)

Doleiden, D., Karmarkar, A., O’Connor, J., Blust, J. (2022) “Impact of Piloting on the Static and Dynamic Stability of Swirl-Stabilized Flames,” ASME Turbo Expo, GT2022-80226. Author accepted pre-print available here.

Karmarkar, A., Boxx, I., & O’Connor, J. (2022) “Relative Effects of Velocity-and Mixture-Coupling in a Thermoacoustically Unstable, Partially-Premixed Flame.” Journal of Engineering for Gas Turbines and Power, 144(1): p. 011003. Accepted author pre-print available here.

Li, J., Kwon, H., Seksinsky, D., Doleiden, D., Xuan, Y., O’Connor, J., Blust, J., Akiki, M., (2022) “Describing the Mechanism of Instability Suppression Using a Central Pilot Flame With Coupled Experiments and Simulations” in Journal of Engineering for Gas Turbines and Power, 144(1), p. 011015. Author accepted pre-print here.

Karmarkar, A., & O’Connor, J. (2021). “Impact of turbulence on the response of flames to external coherent excitation.” Bulletin of the American Physical Society, 66.

Chen, X., O’Connor, J., & Fathy, H. (2021). “Heat Release Rate Estimation Using Multiple Non-Minimum Phase Sensor Measurements in a One-dimensional Combustor.” IFAC-PapersOnLine, 54(20), 723-728. Author accepted pre-print here.

Chen, X., Hemchandra, S., Fathy, H., & O’Connor, J. (2021). “Linear control of thermoacoustic oscillations with flame dynamics modeled by a level-set method.” Combustion and Flame, 237, 111686. Author accepted pre-print here. Supplementary material here.

Chen, X., O’Connor, J., Fathy, H. (2021) “Optimizing Thermoacoustic Characterization Experiments for Identifiability Improves Both Parameter Estimation Accuracy and Closed-Loop Controller Robustness Guarantees,” Combustion Science and Technology, accepted. Accepted author pre-print available here.

Strollo, J., Peluso, S., O’Connor, J. (2021) “Effect of hydrogen on steady-state and transient combustion instability characteristics,” Journal of Engineering for Gas Turbines and Power, 143(7), p. 071023. Accepted author pre-print available here.

Howie, A., Doleiden, D., Peluso, S., & O’Connor, J.(2021) “The Effect of the Degree of Premixedness on Self-Excited Combustion Instability.” Journal of Engineering for Gas Turbines and Power, 143(7), p. 071024. Accepted author pre-print available here.

Bhattacharya, C., O’Connor, J., & Ray, A. (2020) “Data-driven Detection and Early Prediction of Thermoacoustic Instability in a Multi-nozzle Combustor,” Combustion Science and Technology, in press. Accepted author pre-print available here.

Westfall, S., Sekulich, O., Culler, W., Peluso, S., & O’Connor, J. (2020) “Quantification of Variation in Combustion Instability Amplitude in a Multi-Nozzle Can Combustor.” ASME Turbo Expo, London, England. Accepted author pre-print available here.

Chen, X., Fathy, H., & O’Connor, J. (2020). “Impact of Sensor Placement on Mode Observability and LQG Control of a Thermoacoustic System.” IFAC-V 2020. Accepted author pre-print available here.

Karmarkar, A., Yoon, J., Boxx, I., and O’Connor, J., (2020) “Impact of air splits in a dual-stream swirler on fuel-air mixing and thermoacoustic instability in a swirl stabilized high pressure combustor,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, Columbia, SC. Accepted author pre-print available here.

Doleiden, D., Culler, W., Tyagi, A., Peluso, S., O’Connor, J., (2019) “Flame edge dynamics and interaction in a multi-nozzle can combustor with fuel staging,” Journal of Engineering for Gas Turbines and Power, 141(10), p. 101009. Accepted author pre-print available here.

Karmarkar, A., Frederick, M. Clees, S., Mason, D., O’Connor, J., (2019) “Role of turbulence in precessing vortex core dynamics,” ASME Turbo Expo, Phoenix, AZ. Accepted author pre-print available here.

Doleiden, D., Culler, W., Tyagi, A., Peluso, S., O’Connor, J., (2019) “Flame edge dynamics and interaction in a multi-nozzle can combustor with fuel staging,” ASME Turbo Expo, Phoenix, AZ. Accepted author pre-print available here.

Chen, X., Dillen, E., Fathy, H., O’Connor, J., (2019) “Optimizing the design of a Rijke tube experiment for combustion stability model identifiability,” American Control Conference, Philadelphia, PA. Accepted author pre-print available here.

Culler, W., Chen, X., Samarasinghe, J., Peluso, S., Santavicca, D., O’Connor, J., (2018) “The effect of variable fuel staging transients on self-excited instabilities in a multiple-nozzle combustor,” Combustion and Flame, 194, p. 472-484.  Accepted author pre-print available here.

Culler, W., Chen, X., Peluso, S., Santavicca, D., O’Connor, J., Noble, D., (2018) “Comparison of center nozzle staging to outer nozzle staging in a multi-flame combustor,” ASME Turbo Expo, Oslo, Norway. Accepted author pre-print available here.

Chen, X., Culler, W., Peluso, S., Santavicca, D., O’Connor, J., (2018) “Comparison of equivalence ratio transients on combustion instability in single-nozzle and multi-nozzle combustors,” ASME Turbo Expo, Oslo, Norway. Accepted author pre-print available here.

Chen, X., Culler, W., Peluso, S., Santavicca, D., O’Connor, J., (2018) “Effects of equivalence ratio transient duration on self-excited combustion instability time scales in a single-nozzle combustor,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, State College, PA. Accepted version available here.

Sekulich, O., Culler, W., O’Connor, J., (2018) “The effect of non-axisymmetric fuel staging on flame structure in a multiple-nozzle model gas turbine combustor,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, State College, PA. Accepted version available here.

Samarasinghe, J., Culler, W., Quay, B., Santavicca, D. A., O’Connor, J. (2017) “The effect of fuel staging on the structure and instability characteristics of swirl-stabilized flames in a lean premixed multi-nozzle can combustor.” Journal of Engineering for Gas Turbines and Power, 139(12), 121504. Accepted author pre-print available here.

Culler, W., Samarasinghe, J., Quay, B., Santavicca, D. A., O’Connor, J. (2017) “The effect of transient fuel staging on self-excited instabilities in a multi-nozzle model gas turbine combustor,” ASME Turbo Expo, Charlotte, NC. Accepted author pre-print available here.

O’Connor, J., S. Hemchandra, T. Lieuwen, “Combustion Instabilities in Lean Premixed Systems.” Ed. D. Dunn-Rankin and P. Therkelsen, Lean Combustion: Technology and Control, Second Edition.

O’Connor, J., V. Acharya, T. Lieuwen, (2015) “Transverse Combustion Instabilities: Acoustic, Fluid Mechanic, and Flame Processes,” Progress in Energy and Combustion Science, 49, p. 1-39. Accepted author pre-print available here.

Hot Section Materials and Durability

Richens, P., Surrency, C., O’Connor, J., Lynch, S. (2024) “Experimental design for testing the total heat flux through high-temperature components in high-hydrogen combustion environments.” Spring Technical Meeting of the Eastern State Section of the Combustion Institute. Author accepted pre-print available here.

Colborn, J., O’Connor, J. (2024) “Impact of flame-wall interactions on combustor liner heat flux.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Colborn, J., & O’Connor, J. (2024). “Measurement of Heat Flux in Reacting Flow in a Backward-Facing Step Combustor.” AIAA SciTech Forum, Orlando, FL. Accepted author version here.

Colborn, J., & O’Connor, J. (2023). “Variation in Convective and Radiative Heat Transfer with Reynolds Number and Temperature in a Backward-Facing Step Combustor.” AIAA SciTech Forum, National Harbor, MD. Accepted author version here.

Toumey, J., Zhang, P., Zhao, X., Colborn, J., & O’Connor, J. (2022). “Assessing the wall effects of backwards-facing step flow in tightly-coupled experiments and simulations.” In AIAA SciTech 2022 Forum. Accepted author version here.

Leonetti, M., Lynch, S., O’Connor, J., Bradshaw, S. (2017) “Combustor Dilution Hole Placement and Its Effect on the Turbine Inlet Flowfield.” Journal of Propulsion and Power, 33(3), p. 764-775.

Unsteady Flows

Karmarkar, A. & O’Connor, J. (2023) “Interaction between coherent and turbulent oscillations in non-reacting and reacting wake flows,” Journal of Fluid Mechanics, 963, p. A13. Published open access.

Dorer, R., Meehan, M., & O’Connor, J. (2023). “Investigation of Interacting Wake Instability using Complex Network Analysis.” AIAA SciTech Forum, National Harbor, MD. Accepted author pre-print here.

Manoharan, K., Frederick, M., Clees, S., O’Connor, J., Hemchandra, S., (2020) “A weakly nonlinear analysis of the precessing vortex core oscillation in a variable swirl turbulent round jet,” Journal of Fluid Mechanics, 884, p. A29. Accepted author pre-print available here.

Mason, D., Clees, S., Frederick, M., O’Connor, J., (2019) “The effects of exit boundary condition on precessing vortex core dynamics,” ASME Turbo Expo, Phoenix, AZ. Accepted author pre-print available here.

Dare, T. P., Berger, Z. P., Meehan, M., O’Connor, J. (2019). “Cluster-Based Reduced-Order Modeling to Capture Intermittent Dynamics of Interacting Wakes,” AIAA Journal, 57(7), p. 2819-2827. Accepted author  pre-print available here.

Sebastian, J., Emerson, B., O’Connor, J., Lieuwen, T., (2018) “Spatio-temporal stability analysis of linear arrays of 2D density stratified wakes and jets,” Physics of Fluids, 30(11), P. 114103. Accepted author pre-print available here.

Meehan, M., Tyagi, A., O’Connor, J., (2018) “Flow dynamics in a variable-spacing, three bluff-body flowfield,” Physics of Fluids, 30, 025105. Accepted author pre-print available here and supplementary material.

Dare, T., Berger, Z., Meehan, M., O’Connor, J., (2018) “Cluster-based reduced-order modeling to capture intermittent dynamics of interacting wakes,” AIAA SciTech. Kissimmee, FL. Accepted author pre-print available here.

Clees, S., Lewalle, J., Frederick, M., O’Connor, J., (2018) “Vortex core dynamics in a swirling jet near vortex breakdown,” AIAA SciTech. Kissimmee, FL. Accepted author pre-print available here.

Frederick, M., Manoharan, K., Dudash, J., Brubaker, B., Hemchandra, S., O’Connor, J., (2018) “Impact of Precessing Vortex Core Dynamics on Shear Layer Response in a Swirling Jet,” Journal of Engineering for Gas Turbines and Power, 140(6), 061503. Accepted author pre-print available here.

O’Connor, J. (2017) “Disturbance Field Decomposition in a Transversely Forced Swirl Flow and Flame.” Journal of Propulsion and Power, 33(3), p. 750-763. Accepted author pre-print available here.

Mathews, B., S. Hansford, J. O’Connor, (2016) “Impact of Swirling Flow Structure on Shear Layer Vorticity Fluctuation Mechanisms,” ASME Turbo Expo, Seoul, South Korea. Accepted author pre-print available here.

O’Connor, J. (2015) “Visualization of Shear Layer Dynamics in a Transversely Forced Flow and Flame” AIAA Journal of Propulsion and Power, 32(4), p. 1127-1136. Accepted author pre-print available here.

Hansford, S., K. Manoharan, S. Hemchandra, J. O’Connor, (2015) “Impact of flow non-axisymmetry on swirling flow dynamics and receptivity to acoustics,” in ASME Turbo Expo, Montreal, Canada. Accepted author pre-print available here.

Manoharan, K., S. Hansford, J. O’Connor, S. Hemchandra, (2015) “Instability mechanism in a swirl flow combustor: Precession of vortex core and influence of density gradient,” in ASME Turbo Expo, Montreal, Canada.

Alternative Fuels

Webb, M., O’Connor, J., Noble, D. R., Steele, R. (2024) “Outlook for renewable liquid fuels in dual-fuel gas turbine combustors.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Pecchi, M., Motiei, P., Adair, J., O’Connor, J., Goldfarb, J. (2024) “Combustion of solid biofuels from hydrothermal carbonization of food waste.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Motiei, P., Pecchi, M., Adair, J., Goldfarb, J., O’Connor, J. (2024) “Ignition characteristics of cellulose hydrochar using in-situ diagnostics.” Spring Technical Meeting of the Eastern States Section of the Combustion Institute. Author accepted pre-print available here.

Motiei, P., Pecchi, M., Adair, J. L., Goldfarb, J. L., O’Connor, J. (2023) “Pairing Combustion Experiments and Thermogravimetric Analysis to Uncover Timescales Controlling Cellulose Ignition and Burnout in a Hencken Burner,” Combustion and Flame, 258(2), p. 113092. Supplementary material available here. Accepted author pre-print here.

O’Connor, J., Noble, B., & Lieuwen, T. (Eds.). (2022). Renewable Fuels: Sources, Conversion, and Utilization. Cambridge University Press.

Motiei, P., Ahmed, M., Goldfarb, J., O’Connor, J. (2022). “Ignition and combustion of microcrystalline cellulose in a Hencken burner,” Technical Meeting of the Eastern States Section of the Combustion Institute, Orlando, FL. Accepted author pre-print here.

Makwana, A., Jain, A.,  Linevsky, M., Iyer, S., Santoro, R., Litzinger, T., Xuan, Y., O’Connor, J., (2018) “Experimental and numerical investigation of effects of premixing on soot processes in iso-octane co-flow flames,” Proceedings of the Combustion Institute, 37(1), p. 1031-1039. Accepted author pre-print available here.

Makwana, A. K., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., & O’Connor, J. (2018). “Effect of aromatic fuels and premixing on aromatic species and soot distributions in laminar, co-flow flames at atmospheric pressure.” Combustion and Flame, 194, 164-174. Accepted author pre-print available here.

Makwana, A., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., O’Connor, J. (2018) “Effects of hydrogen addition on the structure of n-dodecane, laminar co-flow flame,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, State College, PA.

Makwana, A., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., O’Connor, J. (2018) “Effects of fuel volatility on emissions in a jet flame and a model gas turbine combustor,” Journal of Engineering for Gas Turbines and Power, 140(3), 031505. Accepted author pre-print available here.

Wang, Y., Makwana, A., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., O’Connor, J., (2018) “Effect of fuel Composition on Soot and Aromatic Species Distribution in Laminar, Co-Flow Flames, Part 1: non-Premixed Fuel” Combustion and Flame, 189, p. 443-455.

Makwana, A., Wang, Y., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., O’Connor, J., (2018) “Effect of fuel Composition on Soot and Aromatic Species Distribution in Laminar, Co-Flow Flames, Part 2: Partially-Premixed Fuel” Combustion and Flame, 189, p. 456-471.

Makwana, A., Iyer, S., Linevsky, M., Santoro, R., Litzinger, T., O’Connor, J. (2017) “Effect of aromatic fuels on aromatic species and soot distributions in laminar, co-flow, non-premixed flames at atmospheric pressure,” 10^thS. National Combustion Meeting, College Park, MD.

Makwana, A., A. Jain, M. Linevsky, S. Iyer, R. Santoro, T. Litzinger, Y. Xuan, J. O’Connor, (2016) “Effects of fuel structure on soot precursors in a laminar co-flow flame,” Meeting of the Eastern States Section of the Combustion Institute, Princeton, NJ. Author version available here.

Makwana, A., Y. Wang, M. Linevsky, S. Iyer, R. Santoro, T. Litzinger, J. O’Connor, (2015) “Capturing Soot Formation with the Use of Iso-Octane as a Surrogate for Fischer-Tropsche Fuel,” in 9th U.S. National Combustion Meeting, Cincinnati, OH. Author version available here.

Additive Manufacturing

Mohanty, P., Jalui, S., Manogharan, G., O’Connor, J., Xuan, Y. (2024) “Flashback characterization of additively manufactured swirl-stabilized fuel injector with varying surface roughness.” Spring Technical Meeting of the Eastern State Section of the Combustion Institute. Author accepted pre-print available here.

Energy Issues

Engineering Education

Gregg, A., O’Connor, J. (2022) “Reflecting while doing: Integrating active learning and metacognitive activities in a fully online thermodynamics course.” American Society of Engineering Education Annual Conference, Minneapolis, MN.

Turbulent Flames

Karmarkar, A., Tyagi, A., Hemchandra, S., & O’Connor, J. (2020) “Impact of turbulence on the coherent flame dynamics in a bluff-body stabilized flame,” Proceedings of the Combustion Institute, 38(2), p. 3067-3075. Accepted author pre-print available here and supplemental material.

Tyagi, A., & O’Connor, J. (2020) “Towards a method of estimating out-of-plane effects on measurements of turbulent flame dynamics,” Combustion and Flame, 216, p. 206-222. Accepted author pre-print available here and supplemental material.

Beseler, K., Tyagi, A., & O’Connor, J. (2020) “Development of a diagnostic Damkohler number for interpreting laser-induced fluorescence data in turbulent flames,” AIAA SciTech, Orlando, FL. Accepted author pre-print available here.

Tyagi, A., Boxx, I., Peluso, S., & O’Connor, J. (2020) “Pocket formation and behavior in turbulent premixed flames,” Combustion and Flame, 211, p. 312-324. Accepted author pre-print available here and supplementary material.

Tyagi, A., Boxx, I., Peluso, S., & O’Connor, J. (2019) “Statistics and topology of local flame-flame interactions in turbulent flames,” Combustion and Flame, 203, p. 92-104, Accepted author pre-print available here and supplementary material.

Tyagi, A., Boxx, I., Peluso, S., & O’Connor, J. (2019) “Statistics of local flame-flame interactions in flame interaction zones of two V-flames,” AIAA SciTech Forum, San Diego, CA. Accepted author pre-print available here.

Tyagi, A., Boxx, I., Peluso, S., & O’Connor, J. (2018). “The role of flow interaction in flame–flame interaction events in a dual burner experiment.” Proceedings of the Combustion Institute, 37(2), p. 3485-2491. Accepted author pre-print available here.

Shupp, R., Tyagi, A., Boxx, I., Peluso, S., O’Connor, J., (2018) “The effects of piloting on turbulent flame structure,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, State College, PA. Author version available here.

Tyagi, A., Boxx, I., Peluso, S., Shupp, R., O’Connor, J., (2018) “Topology of local flame-flame interaction events in turbulent flames,” Spring Technical Meeting of the Eastern States Section of the Combustion Institute, State College, PA. Author version available here.

Tyagi, A., Boxx, I., Peluso, S., Shupp, R., O’Connor, J., (2018) “Structure of flames in flame interaction zones,” AIAA SciTech, Kissimmee, FL. Accepted author pre-print available here.

Culler, W., A. Tyagi, P. Venkateswararn, J. O’Connor, (2016). “Comparison of Three Interacting V-Flames to a Single Bluff Body Flame at Two Reynolds Numbers,” AIAA SciTech. San Diego, CA. Accepted author pre-print available here.

Culler, W., J. Crane, R. J. Samarasinghe, M. Meehan, J. O’Connor, (2015) “Effect of Flame Spacing and Flow Velocity on the Dynamics of Three Interacting V-Flames,” in 9th U.S. National Combustion Meeting, Cincinnati, OH. Author version available here.

Diesel Fuel Injection

O’Connor, J., Borz, M., Han, J., Paul, C., Ruth, D., Imren, A., Haworth, D., Martin, J., Sun, C., Boehman, A., Heffelfinger, K., Li, J., McLaughlin, S., Morton, R., Karlsson, A., Andersson, A. (2017) “Optimization of an advanced combustion strategy towards 55% BTE for the Volvo SuperTruck program.” SAE International Journal of Engines, 10(3), p. 1217-1227.

Hessel, R., Yue, Z., Reitz, R., Musculus, M., O’Connor, J. (2017) “Guidelines for Interpreting Soot Luminosity Imaging“, SAE International Journal of Engines, 10(3), p. 1174-1192.

Ruth, D., J. O’Connor, (2017) “Development and Verification of Reduced-Order Model for Diesel Spray Penetration and Spreading during Wall Impingement,” SAE Congress, Detroit, MI. SAE Technical Paper 2017-01-0814. Accepted author version available here.

O’Connor, J., M. Musculus, L. Pickett, (2016) “Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine,” Combustion and Flame, 170, p. 111-123

Borz, M., Y. Kim, J. O’Connor, (2016) “The Effect of Injection Timing and Duration on Jet Penetration and Mixing in Multiple Injection Schedules” 2016 SAE Congress, Detroit, MI. Accepted author version available here.

O’Connor, J. (2016) “Use of advanced fuel injection strategies for emissions reduction in diesel engines,” Meeting of the Eastern States Section of the Combustion Institute, Princeton, NJ

Hessel, R., Yue, Z., Reitz, R., Musculus, M., & O’Connor, J. (2015). “Applying Advanced CFD Analysis Tools to Study Differences between Start-of-Main and Start-of-Post Injection Flow, Temperature and Chemistry Fields Due to Combustion of Main-Injected Fuel.” SAE International Journal of Engines, 8(5), p. 2159-2176.

O’Connor, J. and M. Musculus, (2014) “Effect of Load on Close-Coupled Post-Injection Efficacy for Soot Reduction in an Optical, Heavy-Duty Diesel Research Engine,” Journal of Engineering for Gas Turbines and Power, 136(10), p. 101508

O’Connor, J. and M. Musculus, (2014) “In-Cylinder Mechanisms of Soot Reduction by Close-Coupled Post-Injections as Revealed by Imaging of Soot Luminosity and Planar Laser-Induced Soot Incandescence in a Heavy-Duty Diesel Engine,” SAE Int. J. Engines, 7(2), p. 673-693

Hessel, R., R. Reitz, M. Musculus, J. O’Connor, and D. Flowers, (2014) “A CFD Study of Post Injection Influences on Soot Formation and Oxidation under Diesel-Like Operating Conditions,” SAE Int. J. Engines, 7(2), p. 694-713

O’Connor, J. and M. Musculus, (2014) “Effects of exhaust gas recirculation and load on soot in a heavy-duty optical diesel engine with close-coupled post injections for high-efficiency combustion phasing,” International Journal of Engine Research, 14(4), p. 421-443

O’Connor, J., & Musculus, M. (2013). “Optical investigation of the reduction of unburned hydrocarbons using close-coupled post injections at LTC conditions in a heavy-duty diesel engine.” SAE International Journal of Engines, 6(1), p. 379-399.

O’Connor, J., & Musculus, M. (2013). “Post injections for soot reduction in diesel engines: A review of current understanding.” SAE International Journal of Engines, 6(1), p. 400-421.