ターボポンプの気液二相吸込み性能に関する研究

抄録

In the present study, the gas-liquid two-phase flow performance of a turbopump equipped with an inducer was experimentally investigated. The almost homogeneous bubbly two-phase flow condition was successively set by the uniform aeration of gas dissolved in water upstream of the test pump, which was realized by a sudden pressure decrease with the valve closure. The gas-liquid volumetric flow rate ratio was estimated from the pump inlet pressure and the initial amount of dissolved oxygen under the assumption of mass equilibrium condition of the local dissolved oxygen. The effect of initial dissolved oxygen on the two-phase flow performance of the pump was investigated. It was observed that the head performance dropped at higher NPSH with higher dissolved oxygen condition. On the other hand, with extremely low dissolved oxygen condition, the performance curve well matched with the suction performance curve.