Flow separation unsteadiness in single expansion ramp nozzle

被引：0
|
作者：
He C. [1 ]
Li J. [1 ]
Fan Z. [1 ]
Li Y. [1 ,2 ]
Liang J. [1 ]
Gao R. [1 ]
Miao L. [1 ]
机构：
[1] High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang, 621000, Sichuan
[2] College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2019年 / 34卷 / 11期
关键词：
Asymmetry; Free shock separation(FSS); Restricted shock separation(RSS); Single expansion ramp nozzle(SERN); Unsteadiness;
D O I：
10.13224/j.cnki.jasp.2019.11.005
中图分类号：
学科分类号：
摘要：
In combination with the focus schlieren and dynamic pressure measurement technology, the flow field and nozzle wall pressure were experimentally measured, under the different nozzle pressure ratios (NPR) of the single expansion ramp nozzle (SERN). Time and frequency domain analysis exhibited unsteady flow characteristics within the nozzle. Results showed that the flow field structure inside SERN was obvious asymmetrical. The flow separation mode on the upper wall of the nozzle was at restricted shock separation (RSS), and that on the lower wall at free shock separation (FSS); in RSS mode, the pressure on the wall near the outlet was sharply oscillated in relation to FSS mode. The pressure standard deviation of the upper and lower walls of the nozzle was peaked near the separation point, and the probability density function distribution was skewed to one side or showed double peaks. In RSS mode, the shock motion exhibited obvious low-frequency characteristics. In FSS mode, the unsteady characteristics of the shock wave were not only affected by the pressure disturbance of the recirculation region, but also affected by the separated shear layer. © 2019, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：2339 / 2346
页数：7
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