航空电液压力伺服阀前置级的数值模拟  

Numerical Simulation of the Pre-stage of Aviation Electrohydraulic Pressure Servo Valve

作　　者：刘欣 李祥阳 程冬宏 LIU Xin;LI Xiangyang;CHENG Donghong(School of Mechanical and Electrical Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710311,China;Hydraulic Technology Research Institute,Xihang University,Xi'an Shaanxi 710077,China;School of Vehicle Engineering,Xihang University,Xi'an Shaanxi 710077,China)

机构地区：[1]西安建筑科技大学机电工程学院,陕西西安710311 [2]西安航空学院液压技术研究院,陕西西安710077 [3]西安航空学院车辆工程学院,陕西西安710077

出　　处：《机床与液压》2025年第3期184-190,共7页Machine Tool & Hydraulics

基　　金：陕西省自然科学基金项目(2024JC-YBMS-447)。

摘　　要：为了深入了解机轮刹车系统中电液压力伺服阀内部流场的流动机制,获得不同结构参数变化对航空电液压力伺服阀压力增益的影响,运用CFD流体仿真技术对机轮刹车系统中双喷嘴挡板电液压力伺服阀的前置放大级进行三维流场仿真研究。分析其内部流场变化情况及压力、速度分布,探讨不同伺服阀喷嘴直径、节流口直径下的压力增益与压力特性变化规律,提出同工况下提高航空电液压力伺服阀压力增益与压力灵敏度的设计思路。结果表明:喷嘴直径越小,其压力特性曲线的线性度越好,平均压力增益越大,压力灵敏度越高,静态性能较好;随着节流口直径逐渐变大,其平均压力增益变小,但是过大的节流口直径对伺服阀的压力场和速度场影响较大,综合来看节流口直径在设计范围内取值居中时伺服阀工作效果相对较好。In order to deeply understand the flow mechanism of the internal fluid of the electrohydraulic pressure servo valve in the wheel brake system and obtain the influence of different structural parameters on the pressure gain of the aviation electrohydraulic pressure servo valve,CFD fluid simulation technology was used to simulate the 3D flow field of the pre-stage of the double-nozzle baffle electrohydraulic pressure servo valve in the wheel brake system.The variation of the internal flow field and the distribution of pressure and velocity were analyzed,the pressure gain and pressure characteristics of the servo valve under different nozzle diameters and throttle diameters were discussed,and the design idea of improving the pressure gain and pressure sensitivity of aviation electrohydraulic pressure servo valve under the same working conditions was proposed.The results show that the smaller the nozzle diameter,the better the linearity of the pressure characteristic curve,the larger the average pressure gain,the higher the pressure sensitivity and the better the static performance;as the throttle diameter gradually increases,its average pressure gain becomes smaller,but too large throttle diameter has a great impact on the pressure field and velocity field of the servo valve.In general,when the throttle diameter is in the middle of the design range,the servo valve works relatively well.

关 键 词：航空电液压力伺服阀 前置级 数值模拟 压力增益 

分 类 号：TH137[机械工程—机械制造及自动化]