超声速欠膨胀冲击射流流场振荡的数值模拟

推进技术 ›› 2004, Vol. 25 ›› Issue (1): 7-10.

超声速欠膨胀冲击射流流场振荡的数值模拟

葛其明,姚朝晖,何枫

清华大学工程力学系北京100084;清华大学工程力学系北京100084;清华大学工程力学系北京100084

发布日期:2021-08-15
基金资助:
国家自然科学基金资助项目 (1 990 2 0 0 9)

Numerical simulation on flow field oscillation of under-expanded supersonic impinging jet

Dept. of Engineering Mechanics, Tsinghua Univ., Beijing 100084, China;Dept. of Engineering Mechanics, Tsinghua Univ., Beijing 100084, China;Dept. of Engineering Mechanics, Tsinghua Univ., Beijing 100084, China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究超声速欠膨胀冲击射流自激振荡与喷嘴进出口压比的关系,对轴对称冲击射流进行了数值模拟,计算中采用了雷诺应力模型。结果发现:当喷嘴压比较小时,流场振荡随喷嘴压比的增大而加剧。当压比处于某一范围内时,流场振幅最大,振荡最剧烈。随着压比的继续增大,流场振幅又减小。流场振幅随喷嘴压比的变化与冲击单音强度随喷嘴进出口压比的变化相似,说明流场振荡与冲击单音有内在的关联。

关键词: 超音速射流;振荡;湍流模型;数值仿真

Abstract: To investigate the relationship between the flow field oscillation of an under-expanded supersonic impinging jet with its nozzle pressure ratio (NPR), numerical simulation with the RSM model was applied to symmetrical impinging jet. The results show that the flow field oscillation is relevant to the NPR. The amplitude of the oscillation augments with the increasing NPR, which reaches its maximum on a critical pressure ratio. However, the amplitude reduces as the NPR goes on increasing. The variation of the flow field oscillation with the increasing NPR is similar to that of the impinging tone strength, which illuminates the impinging tone is correlative with the flow field oscillation.

Key words: Supersonic jet flow;Oscillation;Turbulence model;Numerical simulation

葛其明,姚朝晖,何枫. 超声速欠膨胀冲击射流流场振荡的数值模拟[J]. 推进技术, 2004, 25(1): 7-10.