Intermittent Turbulent Flow

摘要: Corrsin [1], [2] established several decades ago the existence of a sharp interface between turbulent and nonturbulent fluid for variety shear flows. Since then large number papers appeared reporting experimental results on conditioned variables. For flat plate boundary layer measurements intermittency factor conditional mean velocity components [2]—[11], including flows with non-zero pressure gradients [3] normal stress components, point statistical expectations [4]–[11] are now available. The zone was reported in [6], fundamental questions concerning discrimination dependence moments threshold levels received attention [7], [8]. Measurements plane jets initial region potential core were by authors [12]–[16]. round measured some available [2], [17]–[21]. comparison free ducted [17] shows that radial profiles deviates significantly from common Gaussian shape due to presence ducts. mixing layers wakes less data quantities [22]–[24], Complex such as interacting [25]–[28] wall [29],. transitional [30] reacting [31]–[33] receiving increasing attention. scale structures lead new views entrainment [34]–[35] averaging [38], [39].