Publications

Journals

  1. Sosa, J., Chambers, J., AHMED, K.A. , Poludnenko, A., Gamezo, V., “Compressible Turbulent Flame Speeds of Highly-Turbulent Standing Flames,” Proceedings of the Combustion Institute, in-press 03/2018.
  2. Geikie, M. , AHMED, K.A. , “Pressure-Gradient Tailoring Effects on the Turbulent Flame-Vortex Dynamics of Bluff-Body Premixed Flames,” Combustion and Flame, under review 02/2018.
  3. Chambers, J. , AHMED, K.A. , “Spontaneous Runaway of Fast Turbulent Flames for Turbulence Driven DDT,” Combustion and Flame, under review 02/2018.
  4. Reyes, J. , Kumar, R. , AHMED, K.A. , “Relationship between the Chemiluminescence Intensity Ratio of C2* and CH*, Charge Pressure, and Equivalence Ratio for Gasoline,” Energy and Fuels, under review 02/2018.
  5. Ninnemann, E, Pryor, O., Barak, S., Nash, L., Loparo, Z., Sosa, J., AHMED, K.A. , Vasu, S. “New insights into the shock tube ignition of H2/O2 at low to moderate temperatures using high-speed end-wall imaging,” Combustion and Flame, Vol. 187, 2018.
  6. Hogue, M.D., Cox, R.E., Mulligan, J. , Ahmed, K, Wilson, J.G. and Calle, L.M., “Dynamic gas flow effects on the ESD of aerospace vehicle surfaces,” Journal of Electrostatics, 91, 2018.
  7. AHMED, K.A. , Wiley, A., “Structured light-field focusing for flowfield diagnostics,” Experimental Thermal and Fluid Science, Vol. 89, 2017.
  8. Chambers, J., AHMED, K.A. , “Turbulent Flame Augmentation using a Fluidic Jet for Deflagration-to-Detonation,” Fuel, accepted, in-press 03/2017.
  9. McGarry, J. , AHMED, K.A. , “Flame-Turbulence Interaction of Laminar Premixed Deflagrated Flame,” Combustion and Flame, Vol. 176, 2017.
  10. Geikie, M.,  AHMED, K.A. , “Lagrangian Mechanisms of Flame Extinction for Lean Turbulent Premixed Flames,” Fuel, Vol. 194, 2017.
  11. Geikie, M.  Carr, Z.R., AHMED, K.A. , Forliti, J., “On the flame-generated vorticity dynamics of bluff-body-stabilized premixed flames,” Flow, Turbulence and Combustion, Vol. 99, 2017.
  12. Chambers, J., AHMED, K.A. , Poludnenko, A., “Exploration of Turbulence Driven Deflagration to Detonation of Fast Flames,” International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS), 2017.
  13. Lovett, J.A., AHMED, K.A., Klusmeyer, A., Smith, A.G., Lubarsky, E., Menon, S., Zinn, B.T., “Influence of Fuel Distribution on the Flame Structure of Bluff-Body Stabilized Flames,” Journal of Engineering for Gas Turbines and Power, Vol. 136, 2014.
  14. AHMED, K.A. , Ali, M. , Alvi, F., “Mixing Characteristics of Transverse Microjet Arrays in a Supersonic Backward-Facing Step Flow,” AIAA Journal, Volume 52, No. 12, 2014.
  15. Ali, M. , AHMED, K.A., Kumar, R., Alvi, F., “Flowfield Characteristics of Oblique Shocks Generated Using Microjet Arrays,” Journal of Flow Control, Vol. 47, No. 11, 2014.
  16. AHMED, K.A., Forliti, D.J., “Fluidic Flame Stabilization in a Planar Combustor Using a Transverse Slot Jet,” AIAA Journal, Vol. 47, No. 11, 2009, pp. 2770-2775.
  17. Carr, Z.R., AHMED, K.A., Forliti, D.J., “Spatially-Correlated Precision Error in Digital Particle Image Velocimetry Measurement of Turbulent Flows,” Experiment in Fluids, Vol. 47, No. 1, 2009, pp. 95-106.
  18. AHMED, K.A., Forliti, D.J., Moody, J., and Yamanaka, R., “Flowfield Characteristics of a Confined Transverse Slot,” AIAA Journal, Vol. 46, No. 1, 2008, pp. 94-103.
  19. AHMED, K.A., Forliti, D.J., Moody, J., “The Effect of Slot Jet Size on the Confined Transverse Slot Jet,” Experiments in Fluids, Vol. 45, No. 1, 2008, pp. 13-26.
  20. AHMED, K.A., Forliti, D.J., “Premixed Flame Stabilization using a Wall-bounded Bluff Body: Influence of Equivalence Ratio and Boundary Layer Tripping,” Combustion Science and Technology, under review.
  21. AHMED, K.A., Forliti, D.J., “Mechanisms Influencing Turbulent Flame Structures of Fluidic Flame Holding,” Combustion and Flame, under review.
  22. Wilmer, F. , AHMED, K.A., “Time-Resolved Dynamic Mode Decomposition of Liquid Jet Dynamics,” Physics of Fluids, under preparation.
  23. Geikie, M. , Sosa, J. , Fernandez, C., AHMED, K * and Kapat, J. “Jet in Crossflow Mixing at Different Injection Angles and Blowing Ratios for Film Cooling Applications” Journal of Fluids Engineering, under prep.
  24. Chambers, J. , AHMED, K , Poludnenko, A., Gamezo, V., “Physics of Turbulence Induced Deflagration-to-Detonation Transition” under prep.

Papers & Proceedings

  1. Rosato, D., Sosa, J., and AHMED, K.A., “Comparison of Measured and Calculated Detonation Propagation Velocities from a Pre-Detonator in Supersonic Crossflow,” 54th AIAA/SAE/ASEE Joint Propulsion, 2018.
  2. Chambers, J., and AHMED, K.A., “Investigation of Criteria for Turbulence Induced Deflagration to Detonation.” 54th AIAA/SAE/ASEE Joint Propulsion, 2018.
  3. Tarrant, D.J., Chambers, J., and AHMED, K.A., “Fast Flame Interaction with High Pressure Turbulent Jets for Turbulent Deflagration-to-Detonation Transition,” 54th AIAA/SAE/ASEE Joint Propulsion, 2018.
  4. Dunn, I., Thurmond, K., AHMED, K.A., Vasu, S., “Exploration of Measuring Pressure Gain Combustion within a Rotating Detonation Engine.” 54th AIAA/SAE/ASEE Joint Propulsion, 2018.
  5. Thurmond, K., Dunn, I., AHMED, K.A., Vasu, S., “A Laser Spectroscopic Instrument for the Fast and Harsh Reacting Flows of Rotating Detonation Engines.” 54th AIAA/SAE/ASEE Joint Propulsion, 2018.
  6. Morales, A., Geikie, M. K., Engelmann, C., AHMED, K.A., and Engelmann, C. UG, “Turbulence Regime Characterization for Premixed Combustion,” 56th AIAA Aerospace Sciences Meeting, 2018.
  7. Engelmann, C., Geikie, M. K., Morales, A., and AHMED, K.A., “Turbulent, Low-Speed, Ballistic Bluff-Body Stabilized Flames’ Extinction Conditions,” 56th AIAA Aerospace Sciences Meeting, 2018.
  8. Ozawa, R., Cox, T., and AHMED, K.A. , “Three-dimensional Measurements of Supersonic Flow Using Tomographic Background Oriented Schlieren,” 56th AIAA Aerospace Sciences Meeting, 2018.
  9. Sosa, J., AHMED, K.A., Hoke, J., and Schauer, F., “Experimental Investigation of Detonation Wave Propagation in a Supersonic Crossflow,” 56th AIAA Aerospace Sciences Meeting, 2018.
  10. Sosa, J., AHMED, K.A., Hoke, J., and Schauer, F., “Velocimetry Measurements using Structured Light-Field Focusing in a Rotating Detonation Engine,” 56th AIAA Aerospace Sciences Meeting, 2018.
  11. Geikie, M. K., Morales, A., Engelmann, C., and AHMED, K.A., “Turbulence-Flame Interaction in the Broken Reaction Regime,” 56th AIAA Aerospace Sciences Meeting, 2018.
  12. Sosa, J., Rosato, D., and AHMED, K.A., “The Propagation Characteristics of a Detonation Wave in a Supersonic Mach 5 Flow,” 56th AIAA Aerospace Sciences Meeting, 2018.
  13. Chambers, J., AHMED, K.A., Stevens, CA, Hoke, J., Schauer F., “Turbulent Detonation Transition in a Linearized Rotating Detonation Engine,” 56th AIAA Aerospace Sciences Meeting, 2018.
  14. Ozawa, R., Cox, T. , Reyes, J., and AHMED, K.A., “Structured Light-Field Focusing 3D Density Measurements of A Supersonic Cone,” 56th AIAA Aerospace Sciences Meeting, 2018.
  15. Loparo, Z., Muraviev, A., Figueiredo, P., Lyakh, A. Peale, R., AHMED, K.A., Vasu, S., “Acousto-Optically Modulated Quantum Cascade Laser Measurements for Combustion,” ASME Turbo Expo 2018.
  16. Reyes, J., and AHMED, K.A., “Simultaneous Spectral Imaging of C2*/CH* at Low-to-High Pressure Combustion,” ASME Turbo Expo 2017.
  17. Khadse, A., Blanchette, L., Kapat, J., Vasu, S., AHMED, K.A., “Optimization of Supercritical CO2 Brayton Cycle for Simple Cycle Gas Turbines Exhaust Heat Recovery Using Genetic Algorithm,” ASME Turbo Expo 2017.
  18. Hogue, M, Cox, R., Mulligan, J., Kapat, J., AHMED, K.A, Wilson, J., Calle, L., “Revision of Paschen’s Law Relating to the ESD of Aerospace Vehicle Surfaces,” Proc. 2017 Electrostatics Joint Conference.
  19. Mulligan, J., Reyes, J., Ozawa, R., and AHMED, K.A., “Triboelectric Charging Influence on Static Pressure Measurements for Space Re-entry and Launch Vehicles.” AIAA Space and Astronautics Forum and Exposition. 2017.
  20. Chambers, J., and AHMED, K.A., “Turbulence Induced Deflagration-to-Detonation Transition,” 53rd AIAA/SAE/ASEE Joint Propulsion. 2017.
  21. Geikie, M. K., Engelmann, C., Morales, A., and AHMED, K.A., “Turbulence-Flame Interaction in the Thin Reaction Regime,” 53rd AIAA/SAE/ASEE Joint Propulsion. 2017.
  22. Engelmann, C., Geikie, M. K., Morales, A., and AHMED, K.A., “Extinction Conditions of Low-Speed Ballistic Bluff-Body Stabilized Flames,” 53rd AIAA/SAE/ASEE Joint Propulsion. 2017.
  23. Morales, A., Geikie, M. K., Engelmann, C., and AHMED, K.A., “Development and Characterization of a Turbulence Generator for Low-Speed Wind Tunnel Applications,” 53rd AIAA/SAE/ASEE Joint Propulsion. 2017.
  24. Tarrant, D.J., Chambers, J., and AHMED, K.A., Experimental Investigation of Solid and Fluidic Obstacle Interactions with Premixed Laminar Flames,” 53rd AIAA/SAE/ASEE Joint Propulsion, 2017.
  25. Sosa, J., and AHMED, K.A., “Advances on the Stabilization of Standing Continuous Detonation for Pressure Gain Propulsion,” 53rd AIAA/SAE/ASEE Joint Propulsion, 2017.
  26. Chambers, J., and AHMED, K.A., “An Experimental Investigation of Fast Hydrogen-Air Flames and Detonations Using a Turbulence Generating Facility.” 55th AIAA Aerospace Sciences Meeting. 2017.
  27. Geikie, M. K., Engelmann, C., Morales, A., Schale, R., and AHMED, K.A., “Turbulence-Flame Interaction in the Wrinkled and Corrugated Flamelet Regimes.” 55th AIAA Aerospace Sciences Meeting. 2017.
  28. Sosa, J., and AHMED, K.A., “Design & Development of a Hypersonic Combustor for Oblique Detonation Wave Stabilization.” 55th AIAA Aerospace Sciences Meeting. 2017.
  29. Ninnemann, E., Pryor, O., Barak, S., Koroglu, B., Sosa, J., AHMED, K.A., & Vasu, S., “High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube.” 55th AIAA Aerospace Sciences Meeting. 2017.
  30. Sosa, J., AHMED, K.A., “Stabilized Standing-Continuous Detonation for Pressure Gain Propulsion,” Turbine Engine Technology Symposium, Dayton OH, September 12 – 15, 2016.
  31. Flores, W., Otero, M., AHMED, K. & Knaus, D. “Gas Turbine Fuel Injectors for Variable-Property Fuels” Turbine Engine Technology Symposium, Dayton OH, September 12 – 15, 2016.
  32. Sosa, J., AHMED, K.A., “Design & Development of a Hypersonic Combustor for Oblique Detonation Wave Stabilization,” 55th AIAA Aerospace Sciences Meeting, Grapevine TX, 9-12 Jan., 2017.
  33. Chambers, J., AHMED, K. “An Experimental Investigation of Fast Hydrogen-Air Flames and Detonations Using a Turbulence Generating Facility” 55th AIAA Aerospace Sciences Meeting, Grapevine TX, 9-12 Jan., 2017.
  34. Geikie, M., AHMED, K., “Turbulence-Flame Interaction in the Wrinkled and Corrugated Flamelet Regimes” 55th AIAA Aerospace Sciences Meeting, Grapevine TX, 9-12 Jan., 2017.
  35. Royero, J., AHMED, K., “Development of a Lagrangian Vortex Subgrid Scale Turbulent Combustion Model” 55th AIAA Aerospace Sciences Meeting, Grapevine TX, 9-12 Jan., 2017.
  36. Ninnemann, E., Sosa, J., Koroglu, B., Pryor, O., AHMED, K. & Vasu, S. “High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube” 55th AIAA Aerospace Sciences Meeting, Grapevine TX, 9-12 Jan., 2017.
  37. Hogue, M. D., Kapat, J., AHMED, K., Cox, R. E., Wilson, J. G., Calle, L. M., & Mulligan, J. “Dynamic Gas Flow Effects on the ESD of Aerospace Vehicle Surfaces” Proc. 2016 Electrostatics Joint Conference, West Lafayette, IN, June 13-16, 2016.
  38. Chambers, J., McGarry, J., AHMED, K.A., “Fluidic Jet Augmentation of a Turbulent Flame for Deflagration-to-Detonation,” 54th AIAA Aerospace Sciences Meeting, San Diago, 4-8 Jan., 2016.
  39. Geikie, M., Sosa, J., Fernandez, C., AHMED, K. & Kapat, J. “Laser Induced Fluorescence Investigation of Single Row Film Cooling at Various Inclination Angles and Blowing Ratios” 54th AIAA SciTech 2016, San Diego, CA, 4-8 Jan., 2016.
  40. McGarry, J., AHMED, K.A., “Laminar Deflagrated Flame Interaction with A Fluidic Jet Flow for Deflagration-to-Detonation Flame Acceleration,” 51st AIAA/SAE/ASEE Joint Propulsion Conference, AIAA Propulsion and Energy Forum, Orlando, FL, 27-29 July, 2015.
  41. Geikie, M., AHMED, K.A., “Velocity-Induced Flame Extinction Dynamics of Lean Premixed Bluff-Body Stabilized Flames,” 51st AIAA/SAE/ASEE Joint Propulsion Conference, AIAA Propulsion and Energy Forum, Orlando, FL, 27-29 July, 2015.
  42. Wiedow, B., AHMED, K.A., “Performance Characteristics of Fluidic-Based Thrust Augmentation Using a Slot Jet for Unmanned Aerial Vehicle Propulsion,” 51st AIAA/SAE/ASEE Joint Propulsion Conference, AIAA Propulsion and Energy Forum and Exposition, Orlando, FL, 27-29 July, 2015.
  43. Geikie, M., AHMED, K.A., “Flame Extinction Dynamics of Lean Premixed Bluff-Body Stabilized Flames,” 53rd AIAA Aerospace Sciences Meeting, Kissimmee, FL, 5-9 Jan., 2015.
  44. Hughes, C.N., Dutta, D., Bashirzadeh, Y. , AHMED, K.A., Qian, S., “Measuring Shear Stress with a Microfluidic Sensor to improve Aerodynamic Efficiency,” 53rd AIAA Aerospace Sciences Meeting, Kissimmee, FL, 5-9 Jan., 2015.
  45. Lovett, J.A., AHMED, K.A., Klusmeyer, A., Smith, A.G., Lubarsky, E., Menon, S., Zinn, B.T., “Influence of Fuel Distribution on the Flame Structure of Bluff-Body Stabilized Flames,” Proceedings of ASME Turbo Expo, San Antonio, TX, 3-7 June, 2013.
  46. AHMED, K.A., Ali, M., Alvi, F., “Mixing Characteristics of Transverse Microjet Arrays in a Supersonic Backward-Facing Step Flow,” 49th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 4-7 Jan., 2011.
  47. Ali, M., AHMED, K.A., Kumar, R., Alvi, F., “Flowfield Characteristics of Oblique Shocks Generated Using Microjet Arrays,” 49th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 4-7 Jan., 2011.
  48. AHMED, K.A., Forliti, D.J., “Turbulent Flame Structures and Flame-Generated Vorticity Influence on Combustor Performance Employing Fluidic Flame Holding,” 48th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 4-7 Jan., 2010.
  49. AHMED, K.A., Forliti, D.J., “On the Mechanisms of Combustion Rate Enhancement of the Fluidic Dump Combustor,” ONR – Advanced Propulsion Review, Monterey, CA, 9-11 June, 2009.
  50. AHMED, K.A., Forliti, D.J., “Performance of Combustors Employing Fluidic Flame Holding,” ONR – International Symposium on Recent Advances in Combustion and Noise Control for Propulsion, Kauai, HI, 10-12 December, 2008.
  51. AHMED, K.A., Forliti, D.J., “Combustor Flowfield Measurements of a Transverse Jet Flame Holder,” 47th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 5-8 Jan., 2009.
  52. AHMED, K.A., Forliti, D.J., “Flame Holding and Combustion Characteristics of a Geometrical Flame Holder,”ASME Heat Transfer, Jacksonville, FL., 10-14 Aug., 2008.
  53. Forliti, D.J., AHMED, K.A., “Flame Stabilization in a Model Ramjet Combustor Using a Transverse Slot Jet,” 46th AIAA Aerospace Sciences Meeting, Reno, NV, 7-10 Jan., 2008.
  54. Forliti, D.J., AHMED, K.A., “Flame Stabilization and Flowfield Characteristics of a Fluidic Dump Combustor,” Proceedings of the 20th ONR Propulsion Conf., Arlington, VA, 12-14 December, 2007.
  55. Forliti, D.J., AHMED, K.A., “Induced Recirculation using Planar Jet Injection for Flame Stabilization,” Proceedings of the 19th ONR Propulsion Conference, Orange County, CA, 18-20 December, 2006.

Conference Presentations

  1. Chambers, J., AHMED, K.A., “Fast Hydrogen-Air Flames for Turbulence Driven Deflagration to Detonation Transition,” 69th APS DFD, Portland, OR 20-22 Nov., 2016.
  2. Chambers, J., Gerdts, S.  AHMED, K.A., “Characterizing Laminar Flame Interactions with Turbulent Fluidic Jets and Solid Obstacles for Turbulence Induction,” 69th APS DFD, Portland, OR 20-22 Nov., 2016.
  3. Royero, J. , AHMED, K.A., “Hybrid Eulerian-Lagrangian Vortex Model for Turbulent Reacting Flows,” 69th APS DFD, Portland, OR 20-22 Nov., 2016.
  4. Chambers, J., McGarry, J., AHMED, K.A., “Turbulent Deflagrated Flame Interaction with a Fluidic Jet Flow for Deflagration-to-Detonation Flame Acceleration,” 68th APS DFD, Boston, MA 22-24 Nov., 2015.
  5. AHMED, K.A., Forliti, D.J., “Experimental Studies of Confined Premixed Flames Stabilized using Bluff Bodies and Transverse Jets,” Sandia National Laboratory Technical Seminar, Livermore, CA, 13 April, 2009.
  6. AHMED, K.A., Carr, Zakery, Forliti, D.J., “Operating Characteristics of a Fluidic Premixed Dump,” 60th APS DFD, Salt Lake City, UT 18-20 Nov., 2007.
  7. Carr, Zakery, AHMED, K.A., Forliti, D.J., “Flow Field Measurements of a Fluidic Dump Combustor,” 60th APS DFD, Salt Lake City, UT 18-20 Nov., 2007.
  8. AHMED, K.A., Forliti, D.J., “Flame Stabilization in a Model Ramjet Combustor Using a Transverse Slot Jet,” MAE Praxair seminar, SUNY at Buffalo, NY, 18 Oct., 2007.
  9. AHMED, K.A., Moody, J., Forliti, D.J., “Flow Field Features of the Induced Recirculation Zone using Planar Jet Injection,” 59th APS DFD, Tampa, FL, 19-21 Nov., 2007.
  10. Moody, J., AHMED, K.A., Forliti, D.J., “A Parametric Study of the Induced Recirculation Zone using Single/Double Planar Jet Injection,” 59th APS DFD, Tampa, FL, 19-21 Nov., 2007.

Patents

  1. “Focusing Systems and Methods for Flow Visualization” K. AHMED, L. Lourenco, A. Wiley, Patent 61/498,809, 2011.
  2. “Shear Stress Sensor” C. Hughes, S. Qian, K. AHMED, Patent 61/918,045, 2014.