のこ歯状壁の流路における圧力損失への流れの向きの影響

概要

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The pressure losses are experimentally studied for the case of airflow in a channel consisting of a periodically serrated wall and a plane one. The profile of the serrated wall is a right triangle. There exists a difference in the pressure losses due to the directions of the main flow, that is, the direction in which the width of the channel gradually diverges and suddenly converges is called diverging flow, and the direction in which it suddenly diverges and gradually converges is called converging flow. This difference is examined by taking as parameters the following three dimensionless numbers : the Reynolds number based on the minimum clearance, the aspect ratio (the ratio of the minimum clearance to the length of one tooth in the serrated wall) and the angle of inclination of the serrated wall. In the range of Reynolds number of about l00 and under, the coefficient of the pressure loss increases as the angle of inclination decreases. It goes without saying that the pressure loss in diverging flow is larger compared with that in converging flow. However, it is experimentally found that, in the cases of a small angle of inclination or/and small clearance, the pressure loss in diverging flow is smaller compared with that in the converging flow. These experimental results are visually clarified by using a visualizing technique undertaken in waterflow with a free surface.
一般社団法人日本機械学会の論文
1993-03-25