高粘度液用渦巻ポンプの性能と内部流れに対する羽根出口角の影響

概要

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In using high viscosity liquid in a centrifugal pump, it is an embarrassing problem that pump performance decreases as the viscosity becomes higher. It is caused by the change of the efficiency due to the various losses such as the disk friction loss, the loss owing to the channel flow inside of impellers, the shock loss, the leakage loss, and so on. In the previous paper, it was descrived to the pump performance for the change of impeller outlet angle and the analysis of shaft power. In this paper, it was clarified that the effect of the Reynolds number on the loss owing to the channel flow inside of impellers, the slip factor at the impeller outlet port and the shock loss at the impeller inlet port for the change of the impeller outlet angle, when high-viscosity liquids were pumped up. Further, it was clarified that the state of the slip and the secondary flow in the channel flow inside of impeller by using the depth taft method for the visualization of the inside flow of impeller. And, an open type impeller having 6 blades in number was used for the experiment, and its impeller outlet angle was lO°, 20°, 40°, 6O°and 73°. The Reynolds number in the experiment was in range of 1.78×10^4∿2.67×10^6.
東海大学の論文