開水路彎曲流の内部機構

Abstract

This paper describes the internal structure of curved flows based on measurements of threedimensional velocity components in the curved reaches of smooth rectangular channels underconditions of subcritical flows.Considering the properties of three voriticity components observed, the flow through acurved section was divided into three regions: the generated region, the developed region andthe fully developed region of secondary flow. The magnitude of secondary flow predicted fromthe longitudinal vorticity equation was confirmed by the experimental results in the generatedregion. Further, the radial distribution of tangential velocity measured in the fully developedregion supported the theory of pervious papers.