JPS56124756A - Impeller for hydraulic machine - Google Patents

Abstract

PURPOSE: To improve performance in such a way that blade angles are taken in the inverse direction to the revolving direction of an impeller to the outlet port of the impeller, flow path area is minimized in comparison with the inlet port of the impeller, etc., and consistuent in the circumferential direction of fluid which is flowed out through the impeller is made relatively larger.

CONSTITUTION: Blade angles are taken in the inverse direction to the revolving direction of an impeller to a reaction water-turbine, guide blades, the outlet port 2 of the impeller for another hydraulic machine, and in comparison with the inlet port 1 of the impeller, etc., the flow path area is minimized. For example, if the flow path area of the outlet port 2 of the impeller is contracted by 1/2 smaller than that of the inlet port 1, on the assumption that speed energy for fluid in the impeller 2 should have the radius from the center of the rotary shaft of the impeller to be r, and the revolving angular speed of the impeller to be ω, fluid is supposed to be flowed out at the flow speed of 2 (rω+(rω)^1/2) according to Bernouilli's theorem. In consequence, the constituent in the circumferential direction is relatively made larger than in the case where flow areas of the inlet port 1 and of the outlet port 2 of the impeller are equal, torque of the impeller can be increased.

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