高速航空燃油泵水力设计及两相流场数值模拟  

Hydraulic Design and Numerical Simulation of Two-phase Flow Field of High-speed Aviation Fuel Pump

作　　者：陈娅 徐三树[1] 张小波 肖若富[2] 陶然[2] CHEN Ya;XU Sanshu;ZHANG Xiaobo;XIAO Ruofu;TAO Ran(The Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory,(AVIC Nanjing Engineering Institute of Aircraft Systems),Nanjing 211106,China;College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China)

机构地区：[1]航空机电系统综合航空科技重点实验室(航空工业南京机电液压工程研究中心),南京211106 [2]中国农业大学水利与土木工程学院,北京100083

出　　处：《大电机技术》2021年第6期47-55,67,共10页Large Electric Machine and Hydraulic Turbine

基　　金：武器装备预研基金(6140311010202)。

摘　　要：为了满足下一代飞机发动机燃料供给的需求,根据供油系统的性能指标,确定燃油泵结构型式,基于速度系数法计算燃油泵的主要结构参数,完成高速燃油泵水力设计,建立其三维模型并进行网格划分。借助ANSYS-CFX仿真软件,基于RNG k-ε湍流模型及Zwart空化模型,实现燃油泵非空化及空化状态下的内流场数值模拟,分析其外特性变化趋势及压力、速度分布规律并预测其空化性能。结果表明:高速燃油泵扬程、效率、功率随流量的变化符合离心泵性能变化规律,且在设计点附近达到最高效率82.76%;有效汽蚀余量较大时,燃油泵扬程基本不发生变化,当有效汽蚀余量减小到一定值,扬程开始缓慢下降而后急剧减小,扬程下降3%对应的临界汽蚀余量为12.7m。In order to meet the demand for fuel supply of the next generation of aircraft engines,the structural type of the fuel pump is determined according to the performance index of the supply system.The main structural parameters are calculated based on the velocity coefficient method,and the hydraulic design of the high-speed fuel pump is completed.The three-dimensional model of the fuel pump is established and the grid is generated.With the help of simulation software ANSYS-CFX,the numerical simulation of the internal flow field of the fuel pump under non-cavitation and cavitation conditions are carried out based on the RNG k-εturbulence model and the Zwart cavitation model.The variation trend of its external characteristics and the distribution of pressure and velocity are discussed,and the cavitation performance is predicted.The results show that the change of head,efficiency and power of high-speed fuel pump with flow rate conforms to the change law of centrifugal pump performance,and the maximum efficiency reaches 82.76%near the design point.With high NPSHa,the head of the fuel pump basically does not change,when the NPSHadecreases continuously,the head begins to decrease slowly and then sharply.The critical cavitation point corresponding to a 3%drop in head is 12.7 m.

关 键 词：高速燃油泵 水力设计 流场特性 空化性能 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化] V228[航空宇航科学与技术—飞行器设计]