Abstract
An unsteady shock-induced combustion (SIC) is characterized by the regularly oscillating combustion phenomenon behind the shock wave supported by the blunt projectile flying around the speed of Chapman-Jouguet detonation wave. The SIC is the coupling phenomenon between the hypersonic flow and the chemical kinetics, but the effects of chemical kinetics have been rarely reported. We compared hydrogen-air reaction mechanisms for the shock-induced combustion to demonstrate the importance of considering the reaction mechanisms for such complex flows. Seven hydrogen-air reaction mechanisms were considered, those available publically and used in other researches. As a first step in the comparison of the hydrogen combustion, ignition delay time of hydrogen-oxygen mixtures was compared at various initial conditions. Laminar premixed flame speed was also compared with available experimental data and at high pressure conditions. In addition, half-reaction length of ZND (Zeldovich-Neumann-Döring) detonation structure accounts for the length scale in SIC phenomena. Oscillation frequency of the SIC is compared by running the time-accurate 3rd-order Navier-Stokes CFD code fully coupled with the detailed chemistry by using four levels of grid resolutions.
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This paper was presented at the AJCPP-2014, Jeju Grand Hotel, Jeju, Korea, March 5–8, 2014. Recommended by Guest Editor Heuy Dong Kim
P. Pradeep Kumar is a Master’s student in the Rocket Propulsion Laboratory, Pusan National University, Republic of Korea. He received his B.E. degree in Aeronautical Engineering from Kumaraguru College of Technology (India). His research interests include high speed combustion, multiphase reactive flows simulation, turbulence combustion and combustion instabilities in rocket engines.
Jeong-Yeol Choi is a Professor of Aerospace Engineering, Pusan National University, Republic of Korea. Currently, he is the Program Manager of Space R&D, National Research Foundation of Korea. He received his Ph.D. from the Seoul National University in 1997. His research interests include High Pressure Combustion, Detonation Combustion, Dynamics of Energetics flows, Reaction Kinetics, Multi-Phase/Particle flows, Turbulence-Chemistry interaction in Chemical Propulsion systems.
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Kumar, P.P., Kim, KS., Oh, S. et al. Numerical comparison of hydrogen-air reaction mechanisms for unsteady shock-induced combustion applications. J Mech Sci Technol 29, 893–898 (2015). https://doi.org/10.1007/s12206-015-0202-2
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DOI: https://doi.org/10.1007/s12206-015-0202-2