一体式诱导轮与叶轮航空离心泵汽蚀特性研究

Cavitation Study of Inducer and Impeller Combination Aero Centrifugal Pump

关键词:  航空燃油离心泵  一体式诱导轮与叶轮  汽蚀特性  CFD  数值模拟

Key words:  Aero fuel centrifugal pump  Combination with inducer and impeller  Cavitation  CFD  Numerical simulation

摘要:

为研究一体式诱导轮与叶轮航空燃油离心泵的汽蚀特性，对该型离心泵进行了汽蚀特性研究。首先在泵的设计中进行了汽蚀特性理论计算；进而通过CFD软件Pumplinx对该型号泵进行了汽蚀性能数值模拟，研究了最差汽蚀工况下的汽蚀特性；然后针对不同汽蚀余量值给出离心泵不同状态下的气液两相分布；最后对离心泵的流量-临界汽蚀余量曲线进行预测，并与理论计算值、试验数据进行对比。研究表明，当进口压力为0.013177MPa时，一体式诱导轮与叶轮航空燃油离心泵产生临界汽蚀状态，小于技术要求最小进口压力0.0325MPa，因此该泵在其工作范围内不会产生汽蚀现象。不同流量下离心泵理论计算与数值模拟的汽蚀特性曲线与试验数据吻合，满足高汽蚀特性需求。

Abstract:

The cavitation study was carried out for inducer and impeller combination aero fuel centrifugal pumps. Firstly，the cavitation characteristics of the model was calculated theoretically. Then，through the CFD software Pumplinx cavitation performance was simulated in the worst operating conditions of cavitation. The gas-liquid two-phase distribution of this type of pump was given at different NPSH values. Finally，the centrifugal pump’s Q-NPSHc curves was predicted，and compared with theoretical calculation and test data. Studies have shown that when the inlet pressure is 0.013177MPa，it is less than 0.0325MPa of technical demand. The pump meets the cavitation critical values. Cavitation phenomenon won’t be produced within this centrifugal pump operating range. Under different flow，the pump cavitation characteristics curves of theoretical calculations and numerical simulation agree well with the test data，and has a high cavitation performance.