有限長十字形ノズルから流出する三次元自由噴流 : 二次流れの統計量への影響

概要

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An experimental study of a three-dimensional free jet of air issuing from a cruciform nozzle with finite axis length is performed in order to clarify how the inward secondary flow on the y axis in the upstream region affects statistical properties of the present flowfield. Reynolds number is kept at 15000. The velocity measurements are made using an X-type hot-wire probe and two constant-temperature anemometers. It is found that the streamwise variation of integral scale along the x axis takes a minimum value in the upstream region owing to the inward secondary flow on both the y and z axes. Skewness and flatness factors on the x axis in the upstream region take maximum and minimum values due to turbulent diffusion transport, respectively. The turbulent kinetic energy and Reynolds shear stress on both the y and z axes are transported toward the jet center region by turbulent diffusion transport. The inward secondary flow on both the y and z axes in the upstream region promotes the inward turbulent advection transport.
1993-03-25