隔膜式定量阀的运动特性与流场分析

Motion Characteristics and Flow Field Analysis of Diaphragm Metering Valve

基于固体火箭发动机复合推进剂小组分原材料高效高精的加料需求,研制了通过气动控制的精准加料隔膜式定量阀。通过AMESim软件搭建气动仿真模型,分析在不同的弹簧刚度、气压力和液压力联合作用下,阀芯相应运动特性与响应速度变化规律。利用Fluent对阀体内液料流场区域进行仿真分析,获得料筒中液料在不同气动压力下,阀芯液压力和流通区域压降及流速的映射关系。依托复合推进剂小组分加料装置,通过高精度测量小组分液料的重量变化数据,分析阀芯在多因素作用下对小组分液料投放稳定性的影响规律,对比分析出口质量流的仿真和试验结果,发现其相对误差小于15%,说明仿真模型可以较好地表征精准加料隔膜式定量阀的流动特性,为后续定量取用高黏度小组分原材料奠定了基础。

Based on the demand for high-efficiency and high-precision dosing of raw materials in the composite propellant subgroups of solid rocket motors,a diaphragm metering valve with pneumatic control for precise dosing has been developed.Through AMESim software to build pneumatic simulation model,analyze in different spring stiffness,pneumatic force and hydraulic force under the joint action,the spool corresponding movement characteristics and response speed change rule.Using Fluent to simulate and analyze the liquid flow field area in the valve body,to obtain the mapping relationship between the hydraulic force of the spool and the pressure drop and flow rate in the circulation area under different pneumatic pressures of the liquid in the cylinder.Relying on the composite propellant sub-group feeding device,the weight change data of sub-feeding liquid material is measured by high-precision weighing scale to analyze the influence of the valve spool on the stability of sub-feeding liquid material under the action of multiple factors,and the relative error is found to be less than 15%by comparing and analyzing the simulation and experimental results of the export mass flow,which indicates that the simulation model can better characterize the flow characteristics of the accurate feeding diaphragm metering valve and lay a foundation for quantitatively taking raw materials of high-viscosity subgroups.