J056052 180度べンド内の加速流れ([J05605]乱流における運動量,熱,物質の輸送現象(5))

概要

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A rapidly-accelerated flow through the curved pipe has been studied experimentally, because of its practical importance in mechanical engineering (e.g., inlet-exhaust duct of the engine and industrial pipework) and physiologic field (e.g., aortic flow). It is very useful to investigate such an unsteady flow experimentally for improvements of mechanical efficiency or early detections of disease. In the present experiment in a curved pipe, for a rapidly accelerating flow from rest to Reynolds number Re =4x104, we measured distributions of axial velocity, wall static pressure and wall shear stress using I-type hot-wire probe, static pressure tap and surface hot-wire, respectively. In conclusion, it is clear that pressure difference between inside and outside wall increases according to the flow rate increase in the pipe during the initial acceleration, the fast region of primary flow is drably biased from the central to outside in the pipe, and the unsteady behavior of the wall shear stress indicates an unstable development with two peaks on the inside wall.
一般社団法人日本機械学会の論文
2011-09-11