二相流が流れる場合のうず巻ポンプの性能の検討 : 第2報,揚程の予測

概要

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A method to predict the head of centrifugal pumps driven in two-phase flow is proposed. With the method, pressure changes in and after the impeller are estimated considering the phase separation in the impeller; that is: (1) The pressure change in the impeller is calculated from integration of the pressure gradient term (dP/ds) in momentum conservation equations of both phases in the impeller. The friction loss coefficients used in the equations are so selected that the calculated hydraulic torques using the equations with the selected coefficients agree with experimental data; (2) The pressure change after the impeller exit is estimated considering velocity difference between the phases induced by the centrifugal force in the impeller as well as losses attributable to two-phase flow. For rated conditions, the calculated results show pretty good agreement with experimental data and the proposed prediction method seems useful. However, for a condition of 45% rotation speed with rated flow rate, the agreement is not good enough and some improvements in the method may be needed.
一般社団法人日本機械学会の論文
1985-11-25