Effects of isolator length on pseudo-shock wave in a rectangular duct
Effects of isolator length on pseudo-shock wave in a rectangular duct
复制标题
DOI：
10.1007/s12206-022-1222-3
复制
发表时间：
2022-12
影响因子：
1.6
通讯作者：
R. Deng;Kexin Wu;H. Kim;Qijun Chen
中科院分区：
文献类型：
--
作者：
R. Deng;Kexin Wu;H. Kim;Qijun Chen
超燃冲压发动机隔离器长度是影响超燃冲压发动机稳定性的重要因素。用数值方法研究了隔振器长度对拟激波的影响。分析了定常和非定常Psw特性，探讨了隔振器长度的影响机理。用已有的实验结果对数值模型进行了验证，验证结果表明该数值模型具有较高的精度。在不同隔振器长度下，研究了PSW结构变化对自激振动的影响。结果表明，随着隔离器长度的增加，PSW的长度增加。随着PSW长度的增加，前激波变得稳定，后激波变得不稳定。这一现象表明，自激振荡的非定常特性与PSW结构密切相关。隔震器长度的影响机理表现为PSW结构变化引起的前后震幅差。
The scramjet isolator length is a very important influence factor on the stability of scramjet engines. The effects of the isolator length on the pseudo-shock wave (PSW) were studied through a numerical method. The steady and unsteady PSW characteristics were analyzed to explore the influence mechanism of the isolator length. The numerical model was validated with the existing experimental results, and the validation results show that the numerical model has high accuracy. The effects of the structural variation of the PSW on self-excited oscillation were explored at different isolator lengths. Result shows that increasing the isolator length increases the length of the PSW. The leading shock becomes stable with the increasing of PSW length, and the following shocks become unstable. This phenomenon indicates that the unsteady characteristics of self-excited oscillation are closely related to the PSW structure. The influence mechanism of isolator length is represented by the amplitude difference of the leading and following shocks caused by the PSW structure variation.