吹出式三次元煙風洞の観測部内気流歪みに関する研究

概要

論文の詳細を見る
In a blow-down type smoke wind tunnel with a 500mm×500mm test section, distortions of wind flow appears often in the test section when the tunnel is operated at wind speed 1.5〜2m/s. These phenomena produce inaccuracy on flow visualization tests. The distortions of flow are as follows: flow on one side wall of the test section is upward and flow on the other side is downward. The effect of these phenomena reaches near the center of the test section. The causes of the phenomena are supposed to be (1) temperature difference between the window side wall and the other side wall of the wind tunnel; (2) temperature distribution of air flow into the axial flow fan of the tunnel; (3) residual rotating component of delivery flow from the fan. Then we examined experimentally these causes of the flow distortions and effects of some countermeasures. In this paper, we report these test results. But we have not yet succeeded in preventing the flow distortions completely. Now we are finding some interesting vertical vortices on the bottom wall of the wind tunnel which seem to be a principal cause of the flow distortions. We will report experimental results on the vertical vortices in the near future.
久留米工業大学の論文
1999-12-20