だ円断面管路内の三次元乱流実験解析

概要

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An experimental study of a fully developed turbulent flow in an elliptical duct with an aspect ratio 2 : 1 was carrid out using a Laser-Doppler anemometer. Special attention was paid for the measurement of Reynolds stresses and the secondary flow of the second kind. In addition to these results, axial mean velocity and turbulent intensity of the central region were measured in the developing flow. Although it is very difficult to measure the secondary flow of the second kind because of its small intensity, this measurement system was able to determine a large eddy caused by the secondary flow in a quarter cross section. At the same time, a clear statement of the distribution of five of the six Reynolds stresses was clarified, showing their characteristic aspects. The axial mean velocity of the central region reaches maximum intensity in the middle of developing. This maximum intensity is a result of shear layer interaction effects as the boundary layers developing along the wall of the elliptical duct begin to merge.
一般社団法人日本機械学会の論文
1994-03-25