NPLS技术及其在高速飞行器气动研究中的应用(英文)

NPLS technique and its applications on aerodynamic investigations of high-speed vehicle

近年来,与高速飞行器相关的超声速/高超声速流动受到了极大关注。这类流动所具有的非定常性、强梯度和可压缩性对试验研究提出了挑战。纳米示踪的平面激光散射技术(NPLS)是2005年由作者所在的研究团队研发的非接触光学测试技术。它能够获得超声速三维流场的某个剖面的瞬态流动结构,并且具有较高的时空分辨率。目前,许多研究结果表明NPLS是研究超声速湍流的一项非常有效的技术。近年来,作者应用NPLS技术在超声速湍流研究中取得了较大的进展,并且基于NPLS开发了其它几种技术,比如基于NPLS的密度场测量技术(NPLS-DT),能够获得超声速流动的密度场信息并还能进一步得到雷诺应力分布。本文介绍了NPLS技术并回顾了其在超声速边界层、激波/边界层相互作用等流动中的应用。由于能够获得雷诺压力和湍动能等统计量,NPLS技术有望在发展可压缩湍流模型的研究中发挥作用。

Supersonic/hypersonic flows involved with the high speed flight have received vast interests.Features of such flows like unsteadiness,intensive gradient and compressibility chal-lenge the ability of experimental methods.Nano-tracer planar laser scattering （NPLS）is a non-intrusive optic technique developed by the authors’group in 2005 ,which can visualize the tempo-ral-resolved flow structures in a cross-section of instantaneous three-dimensional supersonic flow with high spatiotemporal resolution.Many studies have demonstrated that NPLS is an effective technique for studying supersonic turbulence.In recent years,the authors have made great pro-gresses in supersonic turbulence study using NPLS.And several techniques based on NPLS have been developed,such as NPLS-based density technique （NPLS-DT）,which helps to understand the density field of supersonic flows and obtain Reynolds stress distribution.This paper intro-duced NPLS technique for visualizing the fine structures of supersonic flows,and reviewed its ap-plications in supersonic boundary layer,shock/boundary layer interaction and so on.With its a-vailable application on measuring the flow static parameters such as Reynolds stress and turbulent kinetic energy,NPLS would contribute to the development of turbulence models for compressible flows .