Abstract
The flow pattern through an impeller with finite thick blades is generally different from that of infinitely thin blades due to the influence of blade thickness. The present work set out to investigate this phenomenon. The velocity measuring method based on the use of Laser-Doppler velocimeter (LDV) was applied in this paper for determining parameters of flow through twin blades of diagonal impeller of fish transporting pump. Three components of absolute velocity were measured on three surfaces of revolution inside and outside of an impeller near exit. The relative velocity components were also calculated from these flow measurements. A method of analyzing subsonic inviscid flow on a stream surface of revolution of a turbomachine, was used. The singularity method of calculating a two dimensional incompressible and inviscid flow has been applied to obtain a distribution of relative velocity in the region between two adjacent blades and outside of the impeller. A Kutta condition for the flow in the region of a rounded trailing edge was successfully used. The comparison of the calculated results with the experimental data shows good agreements.
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