Unsteady flow and vibration characteristics in micro high-speed fuel pump
WANG Weijun1*, DAI Yongbo1, TAN Xiangjun1, WU Dazhuan2, WANG Liwen3, CHEN Dong4
1. AVIC Chengdu Caic Electronics Co., Ltd., Chengdu, Sichuan 610091, China; 2. College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310000, China; 3. DEC Academy of Science and Technology Co., Ltd., Chengdu, Sichuan 611731, China; 4. Aviation Military Representative Office of Aviation Military Representative Bureau of Army Equipment Department in Chengdu, Chengdu, Sichuan 610091, China
Abstract：A three-dimensional model of a micro high-speed fuel pump was taken as the research object, the SST k-ω turbulence model, PCB 352C33 acceleration sensor and analysis software(DASP-V11)were used as the analysis tool. Based on numerical calculation and experimental methods, the internal pressure, velocity, turbulent kinetic energy under steady conditions, radial force, axial force, pressure pulsation at monitoring points and vibration acceleration in X, Y and Z-axis were obtained respectively. The frequency domain diagram of monitoring points and three axes were obtained by fast Fourier transform. The results show that the numerical results of SST k-ω turbulence model and blade surface densification are consistent with the experimental results. The Y + of blade surface is 0-2.00 and the Y+ of the volute wall is 0.03-25.58. Like the conventional centrifugal pumps, there is an obvious flow separation and turbulent energy dissipation areas in the impeller and volute under the condition of small flow rate. In unsteady flow, the components of radial force in X and Y directions have no obvious periodicity, while the periodicity of axial force is equal to the number of blades. The monitoring points in the rotor-stator interaction area of the volute and impeller show obvious periodicity. The pressure fluctuation amplitude is 960 Hz at the blade frequency, while the vibration amplitude of vibration artery is 1 920 Hz. The vibration amplitude of Z-axis is higher than that of the other two axes. The research results provide a theoretical basis for the optimization design of unsteady flow in high-speed fuel pump.
