An Analysis of Unsteady Torque on a Two-Dimensional Radial Impeller

[+] Author and Article Information
K. Imaichi, Y. Tsujimoto

Osaka University, Toyonaka, Osaka, Japan

Y. Yoshida

Mitsubishi Heavy Industry, Takasgo Lab.; Osaka University, Toyonaka, Osaka, Japan

J. Fluids Eng 104(2), 228-234 (Jun 01, 1982) (7 pages) doi:10.1115/1.3241815 History: Received March 09, 1981; Online October 26, 2009


Unsteady flows around radial impellers are analyzed by the use of singularity methods. Unsteady torque is given for transient and/or sinusoidal flow rate and/or angular velocity fluctuation. It is shown that the unsteady torque can be divided into three components—quasisteady, apparent mass and wake—and the nature of each component is discussed. As a result of separating the torque into these three components, it is shown that the wake component is usually smaller than the others. A gross estimate of torque fluctuation can be made easily by using the apparent mass coefficient given in the paper for logarithmic impellers covering a wide range of blade angles, blade numbers and impeller diameter ratios.

Copyright © 1982 by ASME
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