Influence of air void fraction on pressure fluctuation of centrifugal aviation fuel pump blade
XU Zixuan1, LI Zhenggui1*, WANG Weijun2, WANG Qifan1, XU Yang1
1. Key Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China; 2. Aviation Industry Chengdu Kaitian Electronics Co., Ltd., Chengdu, Sichuan 610091, China
Abstract：In order to investigate the effect of air void fraction on the pressure fluctuation of a split vane aviation fuel pump blade, the numerical calculation of the aviation fuel pump under different air void fraction conditions was performed using the ANSYS CFX software. The laws of gas phase distribution and the fuel pump′s blade pressure pulsation was analyzed. The results show that the gas phase is mainly distributed on the pressure surface of the blade and less on the suction surface. With the void fraction increases, the gas phase develops on the suction surfaces of the long and short blades, and diffuses into the impeller passage. At the relative position 0-0.5 of the front section of the long blade, the proportion of the gas phase volume increases with the increase of the gas content. At the rear section(relative position 0.5-1.0)of the pressure surface of the long blade and the pressure surface of the short blade, the proportion of the gas phase is almost 100%, resulting in gas-liquid separation. On the rear end of the long blade suction surface and the short blade suction surface, the gas phase accounts for almost 0. The gas phase will increase the amplitude of pressure fluctuation at the monitoring point. However, as the void fraction increases, the amplitude of pressure fluctuations at fuel pump blades decrease. The dominant frequencies of the middle section of the long blade and the front section of the short blade will change due to the influence of the void fraction. Due to the design structure of split blades, the influence of void fraction on blade pressure pulsation is mainly reflected at the interface between long and short blades with the most complex flow. The splitter blade can not only improve the flow, but also affecting the pressure pulsation at the corresponding locations. The research results can provide some reference for the design of split vane fuel pump.
