Publications

Journal Articles
“Flow Characterization of the UTSA Hypersonic Ludwieg Tube,” Hoffman, E. N. A., E. J. LaLonde, A. Andrade, I. Chen, H. Bilbo, and C. S. Combs, Aerospace, Vol. 10, No. 5, 2023, p. 463.
“Velocity Measurements in Hypersonic Flow using Molecular Tagging Velocimetry,” Andrade, A., E. N. A. Hoffman, E. J. LaLonde, and C. S. Combs, Optics Express, Vol. 30, No. 23, 2022, pp. 42199-42213
“Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interaction using a Hollow Cylinder Flare Model,” Garcia, M., E. N. A. Hoffman, E. J. LaLonde, C. S. Combs, M. Pohlman, C. Smith, M. Gragston, and J. D. Schmisseur, Fluids, Vol. 7, No. 9, 2022.
“Investigation of the Streamwise Development of Distributed Surface Roughness Effects on Supersonic Flows,” Kocher, B. D., P. A. Kreth, J. D. Schmisseur, E. LaLonde, and C. S. Combs, AIAA Journal, Vol. 60, No. 9, 2022, pp. 5136-5149.
“The Effects of Compressibility on the Performance and Modal Structures of a Sweeping Jet Emitted from Various Scales of a Fluidic Oscillator,” Portillo, D.J, E. Hoffman, M. Garcia, E. LaLonde, C. S. Combs, and R. L. Hood, Fluids, Vol. 7, No. 7, 2022.
“Analysis & Development of a Small-Scale supercritical Carbon Dioxide (sCO2) Brayton Cycle,” Patel, R. C., D. C. Bass, G. P. Dukuze, A. Andrade, and C. S. Combs, Energies, Vol. 15, No. 10, 2022. 
“Are There Different Shades of Green? – The “Greenium” in Power Generation,” Bhanot, K., R. Patel, and C. S. Combs, Journal of Fixed Income, Feb. 2022.
“Modal Analysis of Cylinder-Induced Transitional Shock-Wave/Boundary-Layer Interaction Unsteadiness,” Hoffman, E. N. A., J. M. Rodriguez, S. M. Cottier, C. S. Combs, B. F. Bathel, J. M. Weisberger, S. B. Jones, P. A. Kreth, and J. D. Schmisseur, AIAA Journal, Vol. 60, No. 5, 2022, pp. 2730-2748.
“Physics of Unsteady Cylinder-Induced Shock-Wave/Transitional Boundary-Layer Interactions,” Murphree, Z. R., C. S. Combs, W. M. Yu, D. S. Dolling, and N. T. Clemens, Journal of Fluid Mechanics, Vol. 918, July 2021, A39.
“Scaling of cylinder-generated shock-wave/turbulent boundary-layer interactions,” Lindorfer, S. A., C. S. Combs, C. S., P. A. Kreth, R. B. Bond, and J. D. Schmisseur, Shock Waves, Vol. 30, 2020, pp. 395-407.
“Simultaneous Measurements of Scalar and Velocity using Naphthalene Planar Laser-Induced Fluorescence,” Combs, C. S. and N. T. Clemens, AIAA Journal, Vol. 57, No. 11, 2019, pp. 5054-5060.
“Unsteady Analysis of Shock-Wave/Boundary-Layer Interaction Experiments at Mach 4.2,” Combs, C. S., J. D. Schmisseur, B. F. Bathel, and S. B. Jones, AIAA Journal, Vol. 57, No. 11, 2019, pp. 4715-4724.
“Investigating the Unsteady Dynamics of Cylinder-Induced Shock-Wave/Transitional Boundary-Layer Interactions,” Combs, C. S., E. L. Lash, P. A. Kreth, and J. D. Schmisseur, AIAA Journal, Vol. 56, No. 4, 2018, pp. 1588-1599.
“An Image-Based Analysis of Shock Wave-Boundary Layer Interaction Unsteadiness,” Combs, C.S., P. A. Kreth, J. D. Schmisseur, and E. L. Lash, AIAA Journal, Vol. 56, No.3, 2018, pp. 1288-1293.
“Heat Shield Ablation Visualized using Naphthalene Planar Laser-Induced Fluorescence,” Combs, C. S., N. T. Clemens, P. M. Danehy, and S. M. Murman. Journal of Spacecraft of Rockets, Vol. 54, No. 2, 2017, pp. 476-494.
“Technique for Studying Ablation-Products Transport in Supersonic Boundary Layers by using PLIF of Naphthalene,” Combs, C. S., B. J. Lochman, and N. T. Clemens. Experiments in Fluids, Vol. 57, No. 89, 2016, pp. 1-14.
“Naphthalene Laser-Induced Fluorescence Measurements at Low Temperature and Pressure,” Combs, C. S. and N. T. Clemens. Applied Optics, Vol. 55, No. 13, 2016, pp. 3656-3669.
“Fluorescence Imaging of Reaction Control Jets and Backshell Aeroheating of Orion Capsule,” Combs, C. S., N. T. Clemens, P. M. Danehy, B. Bathel, R. Parker, T. Wadhams, M. Holden, and B. Kirk. Journal of Spacecraft and Rockets, Vol. 52, 2015, pp. 243-252.
“Upconverting Phosphor Thermometry for High Temperature Sensing Applications,” Guo, X., H. Zhao, H. Song, E. Zhang, C. S. Combs, N. T. Clemens, X. Chen, K. K. Li, Y. K. Zou, and Hua Jiang. Sensors & Transducers, Vol 13, 2011, pp. 124-130.
 
Recent Conference Papers
“High-speed laser absorption measurements of temperature and carbon oxides in linear detonation channels,” Fetter, K. L.,* B. Steavenson,* B. Donald,* A. Andrade,* C. S. Combs, D. I. Pineda, J. R. Burr, J. W. Bennewitz, and B. R. Bigler, AIAA Paper 2023-4384, AIAA AVIATION 2023, San Diego, CA, Jun. 12-16, 2023.
“High-Speed Pressure Sensitive Paint Measurements of the Initial Concept 3. X Vehicle at Mach 7,” Dhanagopal, A., C. Williamson, E. J. LaLonde, S. Gutierrez, V. Delgado, A. Andrade, and C. S. Combs., AIAA Paper 2023-1179, AIAA SciTech 2023, National Harbor, MD, Jan 23-27, 2023.
“Effects of distributed roughness on shock-wave/boundary-layer interactions at Mach 7.2,” Hoffman, E. N., D. M. Kendhammer, E. J. LaLonde, A. Andrade, and C. S. Combs, AIAA Paper 2023-0268, AIAA SciTech 2023, National Harbor, MD, Jan 23-27, 2023.
“Application of Pressure-Sensitive Paint to Investigate Hypersonic Shock-Wave/Boundary-Layer Interactions,” Andrade, A., E. J. LaLonde, E. N. Hoffman, S. Gutierrez, and C. S. Combs, AIAA Paper 2023-1178 , AIAA SciTech 2023, National Harbor, MD, Jan 23-27, 2023.
“Boundary Layer Velocity Measurements in a Mach 7 Wind Tunnel using Molecular Tagging Velocimetry,” Andrade, A. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Effects of Surface Roughness on Shock-Wave/Boundary-Layer Interaction using a Hollow Flare Cylinder Model,” Garcia, M. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“The Design and Testing of an Electromechanically Actuated Pitot Probe to Characterize Flow in a Mach 7 Wind Tunnel,” Chen, I. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Development of CFD Models for Mach 7 Ludwieg Tube Validation,” Bilbo, H. A. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Application of a Novel Optical System to Conduct Schlieren Imaging of Detonation Waves,” Donald, B. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Pressure-Sensitive Paint Measurements on a Hypersonic Vehicle,” Delgado, V. E. and C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Application and Calibration of Steady Pressure Sensitive Paint at a Hypersonic Ludwieg Tube Wind Tunnel,” Rendon, A. T., V. V. Granado, C. S. Combs, AIAA Region IV Student Conference, San Antonio, TX, Apr. 1-2, 2022.
“Characterization of the UTSA Mach 7 Ludwieg Tube,” Hoffman, E. N. A., E. J. LaLonde, M. Garcia, V. Delgado, I. Chen, H. Bilbo, and C. S. Combs, AIAA Paper 2022-1600, AIAA SciTech 2022, San Diego, CA, Jan. 3-7, 2022.
“Spectroscopic Imaging of the Flow Around Hypersonic Vehicles,” Bueno, P. C., N. J. Mueschke, E. J. LaLonde, and C. S. Combs, AIAA Paper 2022-2224, AIAA SciTech 2022, San Diego, CA, Jan. 3-7, 2022.
“Preliminary Testing of the UTSA Mach 7 Ludwieg Tube,” Hoffman, E. N. A., J. M. Rodriguez, M. Garcia, V. Delgado, E. LaLonde, and C. S. Combs, AIAA Paper 2021-2979, AIAA AVIATION 2021, Virtual Event, July 26-30, 2021.
“Modal Analysis of a Sweeping Jet Emitted by a Fluidic Oscillator,” Portillo, D.J, E. Hoffman, M. Garcia, E. LaLonde, E. Hernandez, C. S. Combs, and R. L. Hood, AIAA Paper 2021-2835, AIAA AVIATION 2021, Virtual Event, July 26-30, 2021.
“Development of High-Speed Data Acquisition Triggering System for Hypersonic Wind Tunnel Applications,” E. LaLonde, V. Delgado Elizondo, and C. S. Combs, AIAA Region III & IV Student Conference, Virtual Event, 2021.
“Experimental Diaphragm Design for the UTSA Mach 7 Ludwieg Tube,” M. Garcia and C. S. Combs, AIAA Region III & IV Student Conference, Virtual Event, 2021.
“Construction of a Mach 7 Ludwieg Tube at UTSA,” Hoffman, E., Bashor, I. P., and C. S. Combs, AIAA Paper 2020-2998, AIAA AVIATION 2020, Virtual Event, Jun. 15-19, 2020. (Invited)
“Developing Non-Intrusive Diagnostics for the Characterization of Direct-Fired sCO2 Flows,” Bashor, I. P., E. Hoffman, J. Delimont, and C. S. Combs, Paper #48, 7th International Supercritical CO2 Power Cycles Symposium, San Antonio, TX, Mar. 31-Apr. 2, 2020. (Cancelled due to COVID-19)
“Spectral Proper Orthogonal Decomposition Analysis of Shock-Wave/Boundary-Layer Interactions,” Cottier, S. M., C. S. Combs, and L. Vanstone, AIAA Paper 2019-3331, AIAA AVIATION 2019, Dallas, TX, Jun. 17-21, 2019.
“Design and Preliminary Calibration of the UTSA Mach 7 Hypersonic Ludwieg Tube,” Bashor, I. P., E. Hoffman, G. Gonzalez, and C. S. Combs, AIAA Paper 2019-2859, AIAA AVIATION 2019, Dallas, TX, Jun. 17-21, 2019.
“Spectral Proper Orthogonal Decomposition Analysis of Shock-Wave/Boundary-Layer Interactions,” Cottier, S. M. and C. S. Combs, AIAA Region IV Student Conference 2019, Austin, TX, Mar. 29-30, 2019.
“RANS Simulations of the UTSA Mach 7 Ludwieg Tube,” Bashor, I. P. and C. S. Combs, AIAA Region IV Student Conference 2019, Austin, TX, Mar. 29-30, 2019.
“Design Considerations and Analysis of the UTSA Hypersonic Ludwieg Tube Facility,” Hoffman, E. and C. S. Combs, AIAA Region IV Student Conference 2019, Austin, TX, Mar. 29-30, 2019.
“Analysis of Shock-Wave/Boundary-Layer Interaction Experiments at Mach 1.8 and Mach 4.2,” Combs, C. S., J. D. Schmisseur, B. F. Bathel, and S. B. Jones, AIAA Paper 2019-0344, AIAA SciTech 2019, San Diego, CA, Jan. 7-11, 2019.
 “Simultaneous Stereo Digital Image Correlation and Pressure-Sensitive Paint Measurements of a Compliant Panel in a Mach 2 Wind Tunnel,” Ogg, D. R., B. E. Rice, S. J. Peltier, J. T. Staines, S. L. Claucherty, and C. S. Combs, AIAA Paper 2018-3869, 2018 AIAA Fluid Dynamics Conference, Atlanta, GA, Jun. 25-29, 2018.
“Investigation of the Streamwise Development of Distributed Surface Roughness Effects on Supersonic Flows,” Kocher, B. D., C. S. Combs, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2018-4047, 2018 AIAA Fluid Dynamics Conference, Atlanta, GA, Jun. 25-29, 2018.
“Hybrid RANS/LES Simulation of Transitional Shockwave/Boundary-Layer Interactions,” Tester, B. W., J. G. Coder, C. S. Combs, and J. D. Schmisseur,  AIAA Paper 2018-3224, 2018 AIAA Fluid Dynamics Conference, Atlanta, GA, Jun. 25-29, 2018.
“Comparison of 4-camera Tomographic PIV and Single-camera Plenoptic PIV,” Rice, B. E., J. A. McKenzie, S. J. Peltier, C. S. Combs, B. S. Thurow, C. J. Clifford, and K. Johnson, AIAA Paper 2018-2036, 56th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. 8-12, 2018.
“Laser Differential Interferometry and Schlieren as an Approach to Characterizing Freestream Disturbance Levels,” Harris, A. J., P. A. Kreth, C. S. Combs, and J. D. Schmisseur, AIAA Paper 2018-1100, 56th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. 8-12, 2018.
“Development of MIR TLAS System with Applications to Reacting Hot Gas Flows,”  Sweetland, K., C. S. Combs, J. D. Schmisseur, R. Rhodes, F.-Y. Zhang, T. M. Moeller, D. H. Plemmons, AIAA Paper 2018-1023, 56th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. 8-12, 2018.
“The Role of Boundary-Layer Thickness on Cylinder-Generated Shock-Wave/Turbulent Boundary-Layer Interactions, Part I: Computations,” Lindörfer, S. A., C. S. Combs, R. B. Bond, and J. D. Schmisseur, AIAA Paper 2018-0380, 56th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. 8-12, 2018.
“The Role of Boundary-Layer Thickness on Cylinder-Generated Shock-Wave/Turbulent Boundary-Layer Interactions, Part II: Experiments,” Combs, C. S., S. A. Lindörfer, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2018-0824, 56th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. 8-12, 2018.
“Investigation of the Effects of Distributed Surface Roughness on Supersonic Flows,” Kocher, B. D., C. S. Combs, P. A. Kreth, J. D. Schmisseur, and S. J. Peltier, AIAA Paper 2017-4313, 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, Denver, CO, Jun. 5-9, 2017.
“Study of the Dynamics of Transitional Shock Wave-Boundary Layer Interactions using Optical Diagnostics,” Lash, E. L., C. S. Combs, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2017-3123, 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, Denver, CO, Jun. 5-9, 2017
“Simulation of Transitional Shockwave/Boundary-Layer Interaction Using Advanced RANS-based Modeling,” Tester, B. W., J. G. Coder, C. S. Combs, and J. D. Schmisseur, AIAA Paper 2017-4315, 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, Denver, CO, Jun. 5-9, 2017.
“Limiting Cases for Cylinder-Induced Shock Wave/Boundary Layer Interactions,” Lindörfer, S. A., C. S. Combs, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2017-4311, 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, Denver, CO, Jun. 5-9, 2017.
“Experimental Investigation of a Cylinder-Induced Transitional Shock Wave-Boundary Layer Interaction,” Lash, E. L., C. S. Combs, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2017-0760, 55th AIAA Aerospace Sciences Meeting and Exhibit, Grapevine, TX, Jan. 9-13, 2017.
“Numerical Simulations of a Cylinder-Induced Shock Wave/Boundary Layer Interaction,” Lindörfer, S. A., C. S. Combs, P. A. Kreth, and J. D. Schmisseur, AIAA Paper 2017-0534, 55th AIAA Aerospace Sciences Meeting and Exhibit, Grapevine, TX, Jan. 9-13, 2017.