Experimental and Computational Studies of Radial Incident Shock Wave Focusing

Journal of Propulsion Technology ›› 2017, Vol. 38 ›› Issue (3): 489-497.

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Experimental and Computational Studies of Radial Incident Shock Wave Focusing

Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China; Collaborative Innovation Center of Advanced Aero-Engine，Beijing 100191，China,Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China,Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China,Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China,Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China and Aeronautics and Astronautics Engineering Institute，Air Force Engineering University，Xi’an 710038，China

Published:2021-08-15

径向入射激波聚焦实验和数值模拟研究

陈鑫^1,2,谭胜¹,荣康¹,何立明¹,张强¹,朱晓彬¹

空军工程大学航空航天工程学院，陕西西安 710038; 先进航空发动机协同创新中心，北京 100191,空军工程大学航空航天工程学院，陕西西安 710038,空军工程大学航空航天工程学院，陕西西安 710038,空军工程大学航空航天工程学院，陕西西安 710038,空军工程大学航空航天工程学院，陕西西安 710038,空军工程大学航空航天工程学院，陕西西安 710038

作者简介:陈鑫，男，博士，副教授，研究领域为气动热力推进与新概念脉冲爆震发动机。
基金资助:
国家自然科学基金青年科学基金(51106178)。

Abstract

Abstract: In order to obtain the effects of incident shock Mach number on the process of shock wave focusing in a cavity，experiments and numerical simulation were carried out to investigate radial incident shock focusing on a test section where the planar incident shock Mach number was 1.25 and 2.18. CCD camera was used to obtain the schlieren photos of the flow field. Strong-stability-preserving Runge-Kutta method，weighed essential non-oscillation scheme and Block Structured Dynamically Adaptive Mesh Refinement algorithm were adopted to simulate the process of shock wave focusing. There was a good qualitative agreement between the experimental and numerical results. Complex shock wave configurations and interactions such as shock reflection，shock focusing and different shock interaction were observed in both the experiments and numerical calculation results. The shock wave focusing process of different incident shock Mach number were compared. The focusing high Mach number formed a jet while low Mach number did not. Meanwhile，the Mach number of the incident shock wave could determine where the Mach disc formed and its strength，and then influence on flow field stability of shock wave focusing process.

Key words: Shock wave；Focusing；Radial incident；Cavity；Numerical simulation

摘要： 为得到不同入射激波马赫数对凹腔内径向入射激波聚焦过程的影响，对马赫数为1.25和2.18的径向入射激波在实验段内反射聚焦的过程进行了实验和数值模拟研究。用高速CCD拍摄了凹腔中气流流场的纹影图片，并采用保持强稳定性的龙格—库塔格式、加权基本无振荡算法和块结构动态自适应网格加密对激波反射聚焦的过程进行了数值模拟，实验和数值模拟结果吻合较好。复杂的激波形状及其之间的相互作用(如激波反射，激波聚焦和不同激波的相互作用)在实验和数值模拟中都能很好地观测到。通过比较不同马赫数入射激波的反射聚焦过程，发现较高的马赫数下聚焦后能产生射流，而较低的马赫数下却没有。同时发现，入射激波马赫数能影响二次激波出现的位置和强度，进而影响聚焦过程流场的紊乱程度。

关键词: 激波；聚焦；径向入射；凹腔；数值研究

CHEN Xin^1,2,TAN Sheng¹,RONG Kang¹,HE Li-ming¹,ZHANG Qiang¹,ZHU Xiao-bin¹. Experimental and Computational Studies of Radial Incident Shock Wave Focusing[J]. Journal of Propulsion Technology, 2017, 38(3): 489-497.

陈鑫,谭胜,荣康,何立明,张强,朱晓彬. 径向入射激波聚焦实验和数值模拟研究[J]. 推进技术, 2017, 38(3): 489-497.

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Experimental and Computational Studies of Radial Incident Shock Wave Focusing

径向入射激波聚焦实验和数值模拟研究

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