二维粗糙带作用下的高超声速平板流场波前畸变  

Wavefront distortion of hypersonic plate boundary layer under two-dimensional strip

作　　者：石伟龙 魏连风[1] 甘才俊[1] 熊红亮[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《光电工程》2017年第10期990-996,共7页Opto-Electronic Engineering

基　　金：国家973计划资助项目(2009CB724105)

摘　　要：二维粗糙带是常用的加速流场转捩的流动控制方式,理论分析并用风洞实验研究二维粗糙带作用下的高超声速平板边界层引起的波前畸变特性。采用波前检测系统测量高超声速边界层流场的波前畸变,对比有无粗糙带情况下的流场波前分布。研究结果表明,在高超声速平板边界层发生转捩以前,高精度波前测量系统不仅可以给出高速流场的波前分布,同时还可以计算对应的密度场。实验结果还表明,马赫数为5的边界层流场明显失稳时波前畸变有大幅度提高;同时通过对比有无粗糙带时波前畸变特点发现,平板壁面加粗糙带后尽管边界层的流态未发生变化,但相同位置的平均波前、波前均方根和峰谷值明显增大。Two-dimensional strip is a common flow control method to accelerate flow transition. The wavefront dis-tortion resulting from hypersonic boundary layer has been investigated in virtue of theoretical analysis and wind tunnel experiments. Wavefront measurement system is used to measure the wavefront distortion of hypersonic boundary flow, and compare the distribution of flow wavefront with and without strip. The results prove that high-precision wavefront measurement system can present not only wavefront but also density distribution before the flow transition of boundary layer. In addition, the experimental results show that the wavefront distortion in-creases quickly when the flow is obviously unstable. Finaly, comparing the distribution of wavefront induced by strip with the corresponding data without strip, we find that the mean wavefront, root mean square and peak-valey value of wavefront with strip are much larger than that without strip.

关 键 词：波前 粗糙带 高超声速 平板边界层 

分 类 号：TJ765.3[兵器科学与技术—武器系统与运用工程]