Flow Response of Underexpanded Jets to External Excitation at Different Nozzle Pressure Ratios

被引：0
|
作者：
Li X.-P. [1 ]
Zhou R. [2 ]
Zhuang F.-K. [1 ]
Cao L.-W. [1 ]
Xie G.-S. [1 ]
Fan X.-J. [3 ]
机构：
[1] China Special Equipment Inspection and Research Institute, Beijing
[2] Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing
[3] State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2019年 / 40卷 / 06期
关键词：
Characteristic frequency excitations; Flow response; Large eddy simulation; Nozzle pressure ratio; Underexpanded jets;
D O I：
10.13675/j.cnki.tjjs.180379
中图分类号：
学科分类号：
摘要：
To obtain more in-depth understanding on the physics of underexpanded excited jets as well as the flow response of the jets to external excitation at different nozzle pressure ratios (NPR), three-dimensional large eddy simulation (LES) of underexpanded steady and excited jets are carried out at two different nozzle pressure ratios (NPR) of 5.60 and 9.34. The forcing frequencies are the inherent symmetric mode frequency in the steady jets of 14.569kHz, and the excited jets are implemented by imposing the sinusoidal disturbance to the static pressure at the nozzle entrance. The results indicate that the external excitations affect the acoustic patterns, reduce the region of the jet potential core, decrease the number of near-field shock cells, and have a remarkable impact on the mixing between the injected gas and the surroundings. Meanwhile, the dominant frequencies of the excited jets turn into the exciting frequency used and its high-order harmonics, and the dominant mode all switches to axisymmetric mode. In particular, the dominant mode of the steady jet at NPR=9.34 is same as the form of the external excitation, which results in intense flow resonance between the steady jet and the axisymmetric excitation. As a result, forcing the jet at NPR=9.34 provides more decrease in the length of jet potential core and the larger amplitude in pressure fluctuations, and the external excitations have a more effective influence on the jet mixing. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：1239 / 1246
页数：7
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