多级混流式混输泵气液两相增压特性

Under high inlet gas volume fraction, the pressurization of the multiphase pump deteriorates sharply, which poses a threat to the safe and stable operation of the chemical production process. This study uses two test methods, surging test and mapping test, to comprehensively explore the impact of multiple operating parameters on the overall and inter-stage gas-liquid two-phase pressurization characteristics of a three-stage mixed-flow multiphase pump. The results show that with the increase of liquid flow rate, the downward trend of the pressurization curve caused by the deterioration of the performance of the three booster stages gradually disappears. The significant deterioration of the pressurization performance of the multistage multiphase pump is mainly attributed to the sharp decline in the performance of the first booster stage. Increasing liquid flow rate can effectively reduce gas accumulation, and its positive promoting effect on pressurization performance significantly exceeds the negative effect caused by flow separation, so pressurization presents a sudden upward trend with the liquid flow curve. Increasing the inlet pressure helps to alleviate the negative impact of air mass accumulation on pressurization performance.