Login | Register

Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model

Title:

Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model

Yang, Pengfei, Teng, Honghui, Jiang, Zonglin and Ng, Hoi Dick (2018) Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model. Combustion and Flame, 193 . pp. 246-256.

[thumbnail of CNF-D-17-00830_R2.pdf]
Preview
Text (application/pdf)
CNF-D-17-00830_R2.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.
986kB

Official URL: https://doi.org/10.1016/j.combustflame.2018.03.026

Abstract

Oblique detonations induced by two-dimensional, semi-infinite wedges are simulated by solving numerically the reactive Euler equations with a two-step induction-reaction kinetic model. Previous results obtained with other models have demonstrated that for the low inflow Mach number M0 regime past a critical value, the wave in the shocked gas changes from an oblique reactive wave front into a secondary oblique detonation wave (ODW). The present numerical results not only confirm the existence of such critical phenomenon, but also indicate that the structural shift is induced by the variation of the main ODW front which becomes sensitive to M0 near a critical value. Below the critical M0,cr, oscillations of the initiation structure are observed and become severe with further decrease of M0. For low M0 cases, the non-decaying oscillation of the initiation structure exists after a sufficiently long-time computation, suggesting the quasi-steady balance of initiation wave systems. By varying the heat release rate controlled by kR, the pre-exponential factor of the second reaction step, the morphology of initiation structures does not vary for M0 = 10 cases but varies for M0 = 9 cases, demonstrating that the effects of heat release rate become more prominent when M0 decreases. The instability parameter χ is introduced to quantify the numerical results. Although χ cannot reveal the detailed mechanism of the structural shift, a linear relation between χ and kR exists at the critical condition, providing an empirical criterion to predict the structural variation of the initiation structure.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Article
Refereed:Yes
Authors:Yang, Pengfei and Teng, Honghui and Jiang, Zonglin and Ng, Hoi Dick
Journal or Publication:Combustion and Flame
Date:2018
Digital Object Identifier (DOI):10.1016/j.combustflame.2018.03.026
ID Code:990799
Deposited By: Hoi Dick Ng
Deposited On:23 Sep 2022 18:20
Last Modified:23 Sep 2022 18:20
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Research related to the current document (at the CORE website)
- Research related to the current document (at the CORE website)
Back to top Back to top