有限长锥体诱导的斜爆轰波非定常结构的数值研究

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中图分类号：0382 国标学科代码：13035 文献标志码：A

Numerical study on unsteady structure of oblique detonation wave induced by a finite cone

LIU Jiang， GUI Mingyue， ZHANG Daoping， DONG Gang （National Key Laboratory of Transient Physics，Nanjing University of Science and Technology， Nanjing 210094， Jiangsu， China）

Abstract：Axisymmetricconical structures，asacommonconfiguration，induce oblique detonation waves exhibiting significantlygreater structural complexitycompared to those generatedbysharp wedges.Numerical simulationsofoblique detonation waves induced bya finitecone were performedusing the open-source code OpenFOAM，with analysis conducted on post-detonation flow fields，wavefront structure，and detonationcellstructures.The numericalresultsshowthatunder the efectof the finitecone theflowfield behindthedetonation waveissuccessvely influencedbyTaylor-Maccollflowand Prandtl-Meyer expansion waves.The pressure andMach number along the streamlines at diferent positions on the detonation wave front exhibit oscilatory changes with the influence of these two physical processesand triple points on oblique detonationsurfaces，ndthentendtostabilize.Dependingonthediferentpost-detonationflowfield，thedetonationwavefront structure is divided into foursections：smooth ZND（Zel'dovich-Neumann-Dring）-like structure，single-headed triple ponts cel-like structure，dual-headed triple points cellstructureand dual-headed triple point structure influenced by Prandtl-Meyer. Theshock polecurve theory is used to analyzethewave structures.It is found that theupstream-facing triple points exhibits higher detonation intensity，ie.，higher Mach numberand pressure，comparedtothe downstream-facing triplepoints indualheadedtriplepoints structure.Finallybasedontheaboveanalysis，triplepoint tracesarerecorded toobtainfourdiferentel structures： smooth planarstructure，parallel ine structure，oblique rhombus structure，andiregularobliquehombusstructure.

Keywords：finite cone; obliquedetonation wave; Taylor-Maccoll flow; Prandtl-Meyer expansion wave; detonationcel structure

在障碍物的作用下，高超声速可燃气流可形成驻定于障碍物的爆轰，将其原理用于推进系统，称为斜爆轰发动机。（剩余13589字）