TY - GEN
T1 - Capturing unstable wrinkled oblique detonation wave front by Hi-Fi numerical simulation
AU - Choi, Jeong Yeol
AU - Kim, Don Wan
AU - Jeung, In Seuck
AU - Yang, Vigor
AU - Fuhua, Ma
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - Numerical studies were carried out to investigate the cell-like unsteady structure of oblique detonation wave (ODW) with the systematical examination of the effect of grid resolutions, To focus on the effect of activation energy, computations were carried out for a fixed flow condition of Mach number 7 flow over wedge of 30° turning angle with dimensionless heat addition of 10.0, The ODW front remains stable for low activation energy cases regardless of grid resolution, but becomes unstable for high activation energies resulting cell-like wave front structure. Similarly to ordinary normal detonation wave (NDW), intermediate activation energy results in regular oscillation, but higher one results in irregular oscillation, However, the wave structure of unstable ODW was quite different from NDW. Triple points and transverse waves propagate downstream only for the present flow conditions, and numerically simulated smoked foil record exhibits several traces of triple points those rarely intersects with each other. Several sources of the instability were conjectured from the highly refined results. Since the reaction wave behind a shock wave becomes unstable easily by any disturbances, ODW front becomes unstable and results in cell-like front structures by vorticity generated pressure waves and/or the reflected shock wave originating from the triple point. The combined effects of the different sources of instabilities exhibit highly unstable and very complex flow field behind the unstable ODW.
AB - Numerical studies were carried out to investigate the cell-like unsteady structure of oblique detonation wave (ODW) with the systematical examination of the effect of grid resolutions, To focus on the effect of activation energy, computations were carried out for a fixed flow condition of Mach number 7 flow over wedge of 30° turning angle with dimensionless heat addition of 10.0, The ODW front remains stable for low activation energy cases regardless of grid resolution, but becomes unstable for high activation energies resulting cell-like wave front structure. Similarly to ordinary normal detonation wave (NDW), intermediate activation energy results in regular oscillation, but higher one results in irregular oscillation, However, the wave structure of unstable ODW was quite different from NDW. Triple points and transverse waves propagate downstream only for the present flow conditions, and numerically simulated smoked foil record exhibits several traces of triple points those rarely intersects with each other. Several sources of the instability were conjectured from the highly refined results. Since the reaction wave behind a shock wave becomes unstable easily by any disturbances, ODW front becomes unstable and results in cell-like front structures by vorticity generated pressure waves and/or the reflected shock wave originating from the triple point. The combined effects of the different sources of instabilities exhibit highly unstable and very complex flow field behind the unstable ODW.
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M3 - Conference contribution
AN - SCOPUS:34249307458
SN - 1563478188
SN - 9781563478185
T3 - Collection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
SP - 7463
EP - 7469
BT - Collection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference
Y2 - 9 July 2006 through 12 July 2006
ER -