A Study on Performance of Centrifugal Pumps Driven in Two-Phase Flow : (1) Prediction of Hydraulic Torque

概要

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Hydraulic torques of centrifugal pumps driven in two-phase flow are estimated using gas and liquid velocities at the impeller exit which are obtained from momentum conservation equations of both phases in the impeller, in the equations friction loss coefficients between the impeller wall and the phases as well as on the gas-liquid interface are chosen so as to fit a calculated value to a test datum in an appropriate condition. The estimated values show pretty good agreement with test data for pressures of 3.3 and 6.9 MPa and void fractions of 30 - 70% in several operation modes of normal directional flow and rotation. Although the agreement is not good in operation modes of reverse directional flow and rotation, the variation of the estimated torque with void fraction shows a tendency similar to that of the test data.
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