基于流场的气动换向阀流量特性研究

EFFECT OF FLOW PATH ON FLOW CHARACTEMSTIC OF PNEUMATIC SPOOL VALVES

根据可压缩流N-S方程,利用Spalart-Allmaras(简称S-A)湍流模式和有限体积法,并采用四面体非结构网格,对不同阀口开度和接口管径的换向阀进行数值模拟,计算结果与试验吻合较好。通过对流场结构的分析表明,改变阀口开度,可以提高阀的音速流导和临界压力比的值;给出不同接口管径对流量特性的影响;分析得出换向阀流道结构参数的设计方法。研究结果对设计低能耗的气动换向阀具有指导意义。

Reynolds-averaged compressible Navier-Stokes equations are solved numerically for pneumatic spool valves at the conditions of different openings, different interface tube diameter with Spalart-Allmaras (S-A) turbulent model, finite-volume schemes and sufficiently fine unstructured grids. The results demonstrate favorable agreement with experimental data. Flow field indicates conductive value C and the critical pressure ratio b are improved by changing openings. The influence of different interface tube diameter to flowrate characteristics is given. At last, how to design the spool valves are put forward. It has practical significance for us to design lower energy loss pneumatic spool valves.