農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

為瞭解水試所之漁具模型實驗用垂直式環流水槽流場中流速分布之特性，以尋求出 適當之流速測試範圍，利用微流速計 ( SV-3 型 ) 進行有關流場內流速分布特性研究 與探討，獲得如下之結果：驅流馬達轉數與流速之迴歸關係得知，於 X=289.4 cm、 Y=125.0 cm、Z=62.5 cm位置定點檢測 40 rpm 至 300 rpm 轉數範圍時，其中於 200 rpm以下所對應之測值差異變化不甚明顯，流速尚稱穩定；若高於 200 rpm 轉數，則呈 現不穩定現象，換言之本水槽基本性能方面，可適用流速的對應範圍介於 0～69 cm/sec之間。另外，本水槽流速分布均勻性良好，垂直分布方面除轉數於100 rpm～150 rpm 時靠近表面 15 cm水層有稍快之傾向外，其餘水深則於 150 rpm 以下時均呈較均 勻之分布，水平流速方面，在回轉數低於 150 rpm 以下時，亦大致十分穩定；然而高 於此轉數範圍上限之情形下流速則產生明顯的變動，顯示本水槽之均勻流速範圍約為 0 cm/sec～50 cm/sec 間之流速。

In order to find the range of flow speed suitable for modeltesting of fishing gear, the Mini Water Flow-Meter (SV-3) was used to study the characteristics of the flow speed distribution in the vertical type circulating water channel at the Taiwan Fisheries Research Institute during the autumn of 1992. The results were summarized as following: The speed of A. C. motor ranges from 40 to 300 rpm; if under 200 rpm, the flow speed is stable; if the speed is above 200 rpm, the flow speed is unstable and drastically changed. However, the speed of A. C. motor, operating at 40 to 200 rpm resulting in flow speed from 0 to 69 cm/sec is suitable for vertical or horizontal flow speed tests; The study found that the speed of A. C. motor, ranging from 100 to 150 rpm, resulted in an even distribution inthe vertical flow speed. However, the vertical flow speed in the water channel from surface to a depth of 15 cm is a some what fast. In the testing of horizontal distribution of flow speed, 150 rpm of A. C. motor speed is a critical point. Below this point, flow speed is moderately stable. The speed changes frequently if the motor speed is over 150 rpm. Therefore, the water would be evenly distributed if the A. C. motor speed was less then 150 rpm or the flow speed ranged from 0 to 50 cm/sec.