实验流体力学2016，Vol.30Issue(5)：1-8,8.DOI:10.11729/syltlx20160064
湍流边界层外区超大尺度相干结构相位平均波形
Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer
摘要
Abstract
An experimental investigation of the turbulent boundary layer was conducted in a wind tunnel with IFA300 constant temperature anemometer.The simultaneous time series of the streamwise velocity component and the normal velocity component at different wall-normal posi-tions in the turbulent boundary layer were finely measured by a double-sensor X hot-wire probe. The distributions of the turbulence kinetic energy along with the scale were obtained in the near-wall region and the outer region of the turbulent boundary layer through wavelet transform on different velocity components.In the outer region of the turbulent boundary layer,the maximum energy scale and the average burst period of the coherent structure gradually increased.Large-scale vortical structure appeared in the outer region of the turbulent boundary layer.The condi-tional phase-averaging waveforms of the ej ection and sweep events at the maximum energy scale of the coherent structure were extracted by the conditional phase-averaging technique in the near-wall region and the outer region of the turbulent boundary layer.The waveforms of ej ection and sweep events in the outer region of the turbulent boundary layer were different from the wave-forms in the near-wall region.The amplitude of negative Reynolds shear stress was reduced.The conditional phase-averaging waveforms of Reynolds shear stress presented positive and negative fluctuations.关键词
湍流边界层/超大尺度结构/子波分析/喷射Key words
turbulent boundary layer/superstructures/wavelet transform/ej ect分类
数理科学引用本文复制引用
白建侠,郑小波,姜楠..湍流边界层外区超大尺度相干结构相位平均波形[J].实验流体力学,2016,30(5):1-8,8.基金项目
国家自然科学基金项目(11272233,11332006,11471167,11572221) （11272233,11332006,11471167,11572221）
国家重点基础研究发展计划(973)课题(NO.2012CB720101, NO.2012CB720103) （973）
