离心式燃油泵复合叶轮的数字化设计及验证

Digital Design and Validation of Fuel Pump with Complex Centrifugal Impeller

针对现有加油系统的燃油泵不足,采用复合长短叶轮对原有燃油泵进行改进.首先,采用数值模拟方法进行多次迭代设计,得到水力性能最优的复合叶轮模型.其次,对该模型进行了三维流场的数值模拟,分析其内部流动特性与外特性曲线.最后,根据优化设计结果生产试件,并进行试验验证.通过对比复合叶轮和原有叶轮的仿真及试验结果可知,复合叶轮的效率和扬程都高于普通形式的叶轮,特别是有效改善了小流量工况的稳定性,其有效运行区间由原先的1.3倍变流量工况增大到2倍变流量工况.该研究为其他航空高速宽工作区间燃油泵的优化设计提供了参考.

In order to meet the needs of the next generation refueling system,an optimizaed hydraulic model of a particular centrifugal fuel pump was developed with spiltter blade.First,the complex impeller model with best hydraulic performance was redesigned by using the CFD（computational fluid dynamics）method iteratively.Then,the full three-dimensional numerical simulation was applied to the resulting model.The analysis of the internal flow shows that the splitter blade can depress the vortexes effectively.Based on optimization results,specimen products were made and tests were performed to verify the design.The comparison of test data and simulation results show that the performance of the optimized pump is superior to that of the current one.The complex impeller can improve instability of centrifugal pump at small flow and widen its range of working condition from 1.3to 2times of the design flow rate condition.The results of this paper can provide technical support for designing better fuel pumps for other applications.