摘要
本文分析了激波管壁面湍流边界层脉动压力的强度、脉动压力的频率特性及共传播与衰减特性,给出了这些特性的计算方法。通过算例说明了②区和③区壁面脉动压力的强度及其频率随激波马赫数的变化规律,并讨论了壁面脉动对激波管气流品质的影响。
The fluctuating pressure environments of attached turbu-lent boundary layers on shock tube walls have been investigated in thispaper.Analyses of fluctuating pressure characteristics for the turbulentboundary layers induced by moving shock waves or expansion mareshave been performed.The prediction formula for the root-mean-squarefluctuating pressure overall level,power spectral density and cross-po-wer spectral density in the induced boundary layers are given.Exam-ples show that wall fluctuating pressure will increase with primary shockwave Mach number,and the rms intencities of the fluctuating pressurein region ③ are always higher than that in region ②.Moreover,theeffect of turbulent pressure fluctuations on flow field quality in shocktube is also discussed.
关键词
激波管
边界层
脉动压力
相关系数
shock tube
boundary layer
fluctuating pressure
power spectral density
correlation coefficient
