Numerical Analysis about the Dynamic Properties of a Pressure Relief Valve and Improvement Measures

In order to investigate the influence of internal flow field on the dynamic characteristics of a pressure reducing valve, based on the new discrete geometric conservation law and high-order coupling algorithm, numerical simulations of the dynamic characteristics have been performed. The three-dimensional unsteady integral forms of ALE equation is solved by finite volume scheme based on the spring analogy method and dynamic grid. The novel techniques of virtual mesh ventilation method is adopted to solve the problem when multiple bodies move from contact to separation and the mesh topology changes. The results show that the outlet pressure of valve oscillates within wide range upstream pressurization rate, the average pressure is close to the theoretical value of static performance design; numerical simulation reappears vibration divergence which is similar to the test phenomenon, flutter phenomenon is caused by the interfere between aerodynamic force and dynamic systems. By modifying the method, the fault can be eliminated.