复合叶片对小流量工况下燃油离心泵非定常特性的影响

In order to study the effects of long，medium and short combination blades on the unsteady characteristics of aero-fuel centrifugal pumps under the small flow conditions，transient simulation is performed for a certain type of aero-fuel centrifugal pump based on CFD technology. Firstly，3D models and mesh models of centrifugal pumps with prototype scheme and optimization scheme with compound impeller are established. Secondly，based on the RNG k-ε turbulence model，numerical transient simulations for unsteady characteristics of the flow in the pump in the two schemes are conducted. The simulation results show that the long，medium and short combination blades can reduce the large-scale vortices in the impeller flow channels，where the impeller exit slip is reduced and the pressure distribution is demonstrated more uniform. Moreover，certain pressure pulsation in the volute is caused due to the rotor-stator interaction between the impeller and the tongue nearby the volute tongue，and it shows relatively low in the combination blades. In addition，compared with the protype pump，the optimization pump pressurization value is 12.9MPa and its efficiency is 26.9% under low flowrate conditions，where the derivation are 3.5% and 2.6%.