Abstract

In the classical experiments of O. Reynolds made in 1883 the critical value of a dimensionless parameter, named now the Reynolds number, \({\text{R}}{{{\text{e}}}_{c}} \approx 2000\), was determined. As this value is exceeded in a pipe of circular cross-section, a turbulent flow regime can occur. The attempts to define this value more exactly undertaken during the twentieth century have not met with success. In this study, we present a review of theoretical, experimental, and numerical investigations of flows in a round pipe at the stage of transition to turbulence performed in recent years, which make it possible to formulate a new view on the nature of laminar-turbulent transition in these flows.

中文翻译：

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管道中的过渡问题和局部湍流结构

摘要

在1883年O. Reynolds的经典实验中，无量纲参数的临界值现在称为Reynolds数\（{\ text {R}} {{{\ text {e}}} _ {c}} \确定大约2000 \）。当在圆形横截面的管道中超过此值时，会发生湍流状态。在20世纪更准确地定义此值的尝试并未取得成功。在这项研究中，我们对近年来进行的湍流过渡阶段圆管内流动的理论，实验和数值研究进行了综述，从而有可能就层流湍流的性质提出新的观点。这些流程的过渡。