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RESEARCH PAPERS

Measurements of Apparent Mass Torque Coefficients of Two-Dimensional Centrifugal Impellers

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

Osaka University, Toyonaka, Osaka, Japan

T. Moritani

Mitsubishi Electric Corp., Kamakura Works, Kamakura, Kanagawa, Japan

K. Kim

Mobil Sekiyu Corp., Osaka Area Operations Office, Toyonaka, Osaka, Japan

J. Fluids Eng 108(4), 407-413 (Dec 01, 1986) (7 pages) doi:10.1115/1.3242596 History: Received March 28, 1985; Online October 26, 2009

Abstract

Apparent mass torque coefficients for fluctuations of flow rate and angular velocity are determined experimentally for two-dimensional centrifugal impellers. Nearly sinusoidal fluctuations of flow rate and angular velocity are produced by using crank mechanisms, and the resulting unsteady torque on the impeller is measured. The torque is divided into components in-phase and out-of-phase with the displacements. The in-phase components are used to determine the apparent mass coefficients. Drag torque coefficients are defined and used to represent the out-of-phase components. The tests are conducted under various frequencies and amplitudes of the fluctuations with zero mean flow rate and rotational velocity. The apparent mass torque coefficients are compared with theoretical values obtained under the assumption of a two-dimensional potential flow. The experimental values are 5 to 20 percent larger than the theoretical ones and no appreciable effects of the frequency and the amplitude are observed within the range of the experiments.

Copyright © 1986 by ASME
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