Effects of back pressure fluctuation on pseudo-shock waves in a rectangular duct
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DOI 10.1007/s12206-020-1023-5
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1023-5 Keywords: · Pseudo-shock wave · Back pressure fluctuation · Exciting frequency · Numerical simulation · Movable pintle
Correspondence to: Ruoyu Deng [email protected]
Citation: Deng, R., Kim, H. D., Chen, Q. (2020). Effects of back pressure fluctuation on pseudo-shock waves in a rectangular duct. Journal of Mechanical Science and Technology 34 (11) (2020) 4649~4655. http://doi.org/10.1007/s12206-020-1023-5
Received July 6th, 2020 Revised
August 15th, 2020
Accepted September 1st, 2020 † Recommended by Editor Yang Na
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Effects of back pressure fluctuation on pseudo-shock waves in a rectangular duct Ruoyu Deng1, Heuy Dong Kim2 and Qijun Chen1 1
2
Department of Control Science and Engineering, Tongji University, Shanghai, China, Department of Mechanical Engineering, Andong National University, Andong 760-749, Korea
Abstract
Pseudo-shock waves in a scramjet isolator are worth studying. These waves are generally subjected to back pressure fluctuation induced by combustion. The characteristics and unsteadiness mechanism of pseudo-shock waves are investigated using a numerical method. A second nozzle with a movable pintle is utilized to simulate the back pressure fluctuation of a combustion chamber in the numerical model. A 2D numerical method with the kωshear stress transport turbulence model is adopted to investigate the behavior of pseudo-shock waves. Validation of the numerical model is performed by comparing its results with existing experimental results. The accuracy of the numerical model is proven. The present study aims to investigate the unsteady characteristics of pseudo-shock waves in a scramjet isolator. As indicated by the results, the amplitude of pseudo-shock wave motion can be reduced by increasing the exciting frequency of back pressure fluctuation. The influence mechanism of exciting frequency is the phase difference caused by time delay.
1. Introduction Pseudo-shock waves in dual-mode scramjet isolators have elicited public interest. These waves are composed of a shock train region and a subsequent mixing zone. The position of the shock train region is generally subject to back pressure fluctuation in the combustion chamber. Shock train behavior is one of the key characteristics of pseudo-shock waves, and it is closely associated with the performance of dual-mode scramjet. Therefore, the issue of unsteady shock train behavior is worth discussing. Many researchers have performed research on the steady characteristics of pseudo-shock waves in the past few years. A comprehensive review of the characteristics of pseudo-shock waves was conducted by Matsuo [1]. The details of existing studies on the steady characteristics of pseudo-shock waves by using analytical, computational, and experimental methods were reviewed in this paper. The characteristics of
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