单向阀三维动态流场稳定性仿真研究

Research on three-dimensional dynamic flow stability of check valve

对单向阀自激振动机理进行研究,采用线性分析方法提出了单向阀的临界稳定曲线。应用泵阀仿真软件PumpLinx的动网格技术,开展了单向阀三维动态流场仿真分析,数值研究了不同工作压力、不同质量流量条件下的单向阀动态稳定特性。结果表明:在某一工作压力条件下,小流量时单向阀工作不稳定,会形成周期性的阀门颤振,随着质量流量增大,单向阀动态稳定性增强;当质量流量足够大时,单向阀工作稳定,单向阀保持稳定开度工作;质量流量一定时,工作压力降低,单向阀动态稳定性增强。单向阀三维动态流场仿真结果与线性稳定性结论相一致,从三维动态流场角度验证了单向阀自激振动机理及线性稳定性分析方法的有效性。

The mechanism of the check valve self-excited vibration was studied. The critical stable curve of the check valve was obtained by linear analysis. The dynamic grid technology of the pump and valve simulation software PumpLinx was adopted to carry out simulation analysis for three-dimensional dynamic flow of the check valve. The dynamic stability of the check valve was analyzed respectively under the conditions of difl^rent working pressure and mass flow rate. The results indicate that, in a certain working pressure, the check valve works unstably when mass flow rate is small, and periodic valve vibration may generated; dynamic stability of the check valve becomes stronger with the increase of mass flow rate; when mass flow rate is large enough, the check valve works stably; when the mass flow rate is in a certain value, the work pressure is reduced and the dynamic stability of check valve is increased. Three-dimensional dynamic flow simulating results of the check valve are consistent with the linear stability analysis results. The validity of the check valve self-excited vibration mechanism and linear stability analysis method was proved by three- dimensional dynamic flow simulation.