Criticality for Oblique Detonation Waves Induced by a Finite Wedge in Hydrogen-Air Mixture
Two-dimensional oblique detonation waves (ODWs) induced by finite wedges in a stoichiometric hydrogen-air mixture have been investigated numerically based on reactive Euler equations with a detailed chemical reaction model. The expansion waves emanating from the turning point of wedge only affect the ODW structure located downstream of their interaction points. The ODW would be reduced to CJ detonation or decoupled combustion downstream due to the effects of expansion waves. Three combustion regimes, detonation, decoupled combustion, and no ignition, have been observed, as the wedge length decreases. It is found that the location of the interaction point of the incident wave and expansion wave is a key parameter for determining the expansion wave’s effects on the detonation initiation. Furthermore, the initiation criterion of ODWs for finite wedges is proposed and the critical wedge length is obtained. When the wedge length is greater than the critical wedge length, ODWs can be initiated. When the wedge length is smaller than the critical wedge length, the initiation of ODWs do not occur. For wedge lengths small enough, no ignition occur. Previously proposed criteria that use the induction length are also examined and compared with the present critical wedge length criterion in this study, the latter is proven to achieve better results
Year of publication: |
[2022]
|
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Authors: | Qin, Jianxiu ; Yang, Wubing ; Yan, Ming |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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