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On the transition between different initiation structures of wedge-induced oblique detonations

Title:

On the transition between different initiation structures of wedge-induced oblique detonations

Zhang, Yining, Yang, Pengfei, Teng, Honghui, Ng, Hoi Dick and Wen, Chihyung (2018) On the transition between different initiation structures of wedge-induced oblique detonations. AIAA Journal, 56 . pp. 4016-4023.

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Official URL: https://doi.org/10.2514/1.J056831

Abstract

Oblique detonation waves (ODWs) have been widely studied due to their application potential for airbreathing hypersonic propulsion. Moreover, various formation structures of wedge-induced oblique detonation waves have been revealed in recent numerical investigations. Given the inflow conditions, the wave configuration is dependent on the wedge angle. Hence, any wedge-angle change will induce a transient ODW evolution to transition from one configuration to another. In this study, the transient development created by instantaneously changing the wedge angle is investigated numerically, based on the unsteady two-dimensional Euler equations and one-step irreversible Arrhenius chemical kinetics. The evolution caused by the abrupt wedge-angle change from one smooth initiation structure to another, both with a curved oblique shock/detonation surface at high-Mach-number regime, is investigated. Two processes are analyzed; the first consists of the downstream transition of the ODW initiation region the by decreasing the angle, and the second is the upstream transition by increasing the angle. In the downstream transition, the overall structure moves globally and readjusts continuously, generating an intermediate kinklike initiation structure. In the upstream transition, a localized reaction region forms and induces a more complex process, mainly derived from the different responding speeds of the oblique shock and detonation waves. To avoid the generation of the new localized explosion region, which causes an abrupt change in the initiation position and potentially affects the ODWE’s stability and performance, it is suggested to vary the wedge angle in incremental steps within a certain time interval.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Article
Refereed:Yes
Authors:Zhang, Yining and Yang, Pengfei and Teng, Honghui and Ng, Hoi Dick and Wen, Chihyung
Journal or Publication:AIAA Journal
Date:2018
Digital Object Identifier (DOI):10.2514/1.J056831
ID Code:990807
Deposited By: Hoi Dick Ng
Deposited On:23 Sep 2022 17:36
Last Modified:23 Sep 2022 17:36
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