不同叶片型式对高速航空液冷泵的影响

Influences of different blade types on high speed aviation liquid pump

为研究不同叶轮型式的高速航空液冷泵外特性和非定常压力脉动,采用3种不同型式的离心叶轮,基于RNG k-ε双方程湍流模型对其流场进行了数值求解,得到了泵的外特性曲线、静压分布、流线分布及隔舌处、蜗壳出口处2个监测点的压力脉动频域特性,并对其进行了试验验证。结果表明:在设计工况下,模型1的效率最高,模型3的增压最高,模型3扬程曲线呈水平直线;模型1的主频为叶频,采用长短叶片型式模型的主频在50 L/h时为2倍的叶频,在150 L/h时为叶频。分析结果为航空液冷泵的优化设计提供了一定的理论依据。

In order to analyze the external characteristics and unsteady pressure fluctuation characteristics of high speed aviation liquid pump,the external characteristic curve,static pressure distribution,streamline distribution of the pump and the frequency domain characteristics of pressure pulsation at the tongue and volute outlet were simulated by RNG k-εturbulence model with three different types of centrifugal impeller,and were verified by experiments.The results show that under the design condition,the efficiency of model 1 is the highest,the pressurization of model 3 is the highest,and the head curve of model 3 presents a horizontal straight line.The main frequency of model 1 is the blade frequency,which is twice the blade frequency at 50 L/h in the form of long and short blades and is blade frequency at 150 L/h.The analysis results provide a theoretical basis for the optimal design of aviation liquid pump.