• 机械与动力工程 •

### 变汽液比条件下高速燃油离心泵非定常特性分析研究

1. 1.长安大学 工程机械学院, 西安 710064
2.西北工业大学 动力与能源学院,西安 710072
3.中国航发西安动力控制科技有限公司,西安 710077
• 收稿日期:2021-03-22 出版日期:2022-05-28 发布日期:2022-06-07
• 作者简介:李嘉(1989-),男,陕西省咸阳市人,讲师,主要从事燃油泵、阀性能及结构可靠性设计研究.电话(Tel.):029-88431120; E-mail: lijia@chd.edu.cn.
• 基金资助:
陕西省自然科学基金(2020JQ-335);国家重大专项(2017-V-0013-0065)

### Transient Characteristics of a High-Speed Aero-Fuel Centrifugal Pump in Variable Gas-Liquid Ratio Conditions

LI Jia1(), LI Huacong2, WANG Yue3

1. 1. School of Construction Machinery, Chang’an University, Xi’an 710064, China
2. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
3. China Avic Xi’an Aero-Engine Controls Technology Co., Ltd., Xi’an 700077, China
• Received:2021-03-22 Online:2022-05-28 Published:2022-06-07

Abstract:

To clarify the transient flow characteristics of a high-speed aero-fuel centrifugal pump in variable gas-liquid ratio conditions, numerical simulations for the internal flow field in design flow rate and small flow rate conditions are conducted, focusing on the transient flow characteristics and time-frequency performance of pressure pulsation in the impeller channel. The conversion relationship between gas-liquid ratio and inlet pressure is given to determine the inlet simulation boundary, and then the grid model and length of time step are checked for relevant test. The prediction results between simulations and test are given to verify the effectiveness of the adopted simulation method. Then, the transient characteristics are analyzed through the results of pressure contour and turbulent kinetic energy, and the time-frequency performances of pressure pulsations at impeller inlet and outlet are conducted by fast Fourier transform(FFT). The results show that the flow in the impeller channel is relatively stable under the fuel saturation condition, and the main frequency of pressure amplitude is rotation frequency. With the increase of gas-liquid ratio, the impeller inlet produces a low-pressure zone whose area is significantly enlarged. Besides, a certain wake flow zone is generated at impeller outlet, where the turbulent energy dissipation rate is also demonstrated to be the strongest at these zones. Moreover, the inlet pressure is generally decreased with the increase of gas-liquid ratio, and the main frequency at the design flow rate is rotation frequency, but other frequency multiplication appears at the small flow rate. Meanwhile, the wake flow at the impeller outlet does not seriously affect the main frequencies at the monitoring points, where the main frequency is still rotation frequency.