| 摘 要： | Based on the hydrodynamic stability theory of distorted laminar flow and the kind ofdistortion profiles on the mean velocity in parallel shear flow given in paper[1].this paperinvestigates the nonlinear stability behaviour of parallel shear flow,carries on stabilitycalculation taking account of the perturbations of background turbulence noise undercertain assumption,and obtains some results in accordance qualitatively with those ofexperiment for plane Poiseuille flow and pipe Poiseuille flow.
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