纵向脊状表面湍流猝发频率检测  

Research on the Burst Detection in Turbulent Boundary Layer Over Longitudinal Ridge Surfaces

作　　者：胡海豹[1] 宋保维[1] 刘占一[1] 黄桥高[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《测控技术》2011年第7期23-26,共4页Measurement & Control Technology

基　　金：国家自然科学基金资助项目(50835009);陕西省自然科学基础研究计划资助项目(2010JQ1009);西工大新人新方向计划资助项目

摘　　要：在小型低速风洞中开展了一系列纵向脊状表面与光滑平板表面湍流边界层猝发频率检测研究,并获得了典型纵向脊状表面湍流猝发频率特性。试验在一小型低速风洞中开展,流场测试中使用恒温式IFA300智能型流动分析仪,测试模型采用有机玻璃材质的矩形平板结构;而在湍流边界层猝发频率检测中,则采用了一套基于Mu-level法的湍流猝发频率四步测试方法(试采样、试分析、采样、检测分析)。最终研究结果表明,纵向脊状表面与光滑平板表面的湍流猝发频率的最佳检测位置都位于边界层过渡层和对数律层,湍流猝发频率也均随风速的提高而不断增大,且不同风速时两者的湍流猝发频率值基本一致,说明纵向脊状结构的存在并不影响壁面湍流猝发频率。By performing a number of experiments on the turbulence burst of smooth plate surfaces and different longitudinal ridge surfaces in various sizes at different wind velocities,the burst characteristic over longitudinal ridge surfaces in the boundary layer is acquired.The experiments are carried out in a low-velocity wind tunnel with a small size.The flow field is tested with a TSI-IFA300 hot wire anemometer.The test models,which are made of organic glass,are rectangle-plate placed so as to make sure ridge surfaces are streamwise.In the burst detection in the turbulent boundary layer,a four-step method of detecting burst frequency with Mu-level algorithm（fore-sampling,fore-analysis,sampling,detection analysis） is adopted.Ultimate results show that the better testing positions of burst detection over both smooth plate surfaces and different longitudinal ridge surfaces are located in the buffer zone and logarithm region,and the burst frequencies over both surfaces increase steadily with the wind velocity,in addition,the burst frequencies over both surfaces are consistent in the main,so the existence of longitudinal ridges can not affect burst frequencies in turbulent boundary layer.

关 键 词：脊状表面 猝发 湍流边界层 Mu-level法 风洞 

分 类 号：O357[理学—流体力学]