射流管伺服阀前置级的动态流场分析

发布时间：2018-01-20 08:38

本文关键词： 流体动力学射流管伺服阀瞬态流场涡量动态响应　出处：《仪器仪表学报》2017年07期 　论文类型：期刊论文

【摘要】：射流管电液伺服阀的喷嘴到接收孔间的流场较为复杂,尤其在射流管偏转及阀芯运动的动态情况下,会存在回流、漩涡等现象。以某型射流管电液伺服阀结构为模型,结合射流管偏转时的阀芯力平衡关系,得到阀芯的运动方程,应用雷诺平均方程和标准两方程模式的封闭方程,通过流体动力学软件FLUENT建立射流管伺服阀喷嘴到阀芯两腔的三维可视化模型,仿真分析了喷嘴到接收孔的前置级瞬态流场及阶跃响应。仿真结果表明:接收孔中的涡量强度会影响射流管电液伺服阀的阶跃响应,涡量强度越大、振荡越大、阶跃响应越慢,并通过试验测试阀芯位移验证了数值计算的正确性,同时对比了不同接收孔间夹角的同时刻涡量及阶跃响应,得到接收孔间夹角为45°的最优设计。研究方法和结果对于提高射流管电液伺服阀的动态响应有重要参考价值。
[Abstract]:The flow field between the nozzle of the jet tube electro-hydraulic servo valve and the receiving hole is more complex, especially in the dynamic situation of the jet tube deflection and the movement of the valve core, there will be reflux. Taking the electro-hydraulic servo valve structure of a certain type of jet tube as a model and combining with the balance relation of the valve core force when the jet tube is deflecting, the motion equation of the valve core is obtained. Based on the closed equations of Reynolds mean equation and standard two-equation model, a three-dimensional visualization model of jet tube servo valve nozzle to valve core is established by using the fluid dynamics software FLUENT. The simulation results show that the vorticity intensity in the receiving hole will affect the step response of the electro-hydraulic servo valve, and the larger the vorticity intensity, the greater the oscillation. The slower the step response is, the correctness of the numerical calculation is verified by testing the valve core displacement, and the simultaneous vorticity and step response between different receiving holes are compared. The optimum design of 45 掳angle between the receiving holes is obtained. The research method and results have important reference value for improving the dynamic response of the electro-hydraulic servo valve of the jet pipe.
【作者单位】：西北工业大学自动化学院;
【基金】：航空基金(20150153002)项目资助
【分类号】：TH137.52
【正文快照】： 1引言电液伺服阀作为电液伺服控制的关键元件,不仅实现了电气信号与液压信号之间的转换,而且能够实现功率放大,其性能会影响到整个系统的控制精度以及响应速度。电液伺服阀按先导级不同主要分为滑阀式、喷嘴挡板式和射流管式,其中射流管伺服阀因其具有抗污染能力强、力矩马达

【相似文献】