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Studies on the Flow Characteristics of the Vertical Circulating Water Channel of TFRI

  • Date:1993-12-01
  • Volume:1
  • No:2
  • Page:13-23
  • Auther:Lin, H. C., M. C. Wang

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.