Periodic oscillation and fine structure of wedge-induced oblique detonation waves |
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Authors: | Ming-Yue Gui Bao-Chun Fan Gang Dong |
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Institution: | [1]State Key Laboratory of Transient Physics, Nanjing University of Science and Technology, 210094 Nanjing, China [2]State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China |
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Abstract: | An oblique detonation wave for a Mach 7 inlet flow over a long enough wedge of 30° turning angle is simulated numerically
using Euler equation and one-step rection model. The fifth-order WENO scheme is adopted to capture the shock wave. The numerical
results show that with the compression of the wedge wall the detonation wave front structure is divided into three sections:
the ZND model-like strcuture, single-sided triple point structure and dual-headed triple point strucuture. The first structure
is the smooth straight, and the second has the characteristic of the triple points propagating dowanstream only with the same
velocity, while the dual-headed triple point structure is very complicated. The detonation waves facing upstream and downstream
propagate with different velocities, in which the periodic collisions of the triple points cause the oscillation of the detonation
wave front. This oscillation process has temporal and spatial periodicity. In addition, the triple point trace are recorded
to obtain different cell structures in three sections. |
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Keywords: | Oblique detonation wave Wedge - Periodic oscillation Fine structure |
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