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Numerical simulation study on the opening process of the atmospheric relief valve

2019; Elsevier BV; Volume: 351; Linguagem: Inglês

10.1016/j.nucengdes.2019.05.034

1872-759X

Zhang Zhen-hua, Li Jia, Xin Yang,

Advanced Sensor and Control Systems

The opening characteristics of a 3-D power operated pressure relief valve were studied experimentally and numerically. The experimental results were used to study the mechanism controlling the valve opening time. The CFD simulations used the trimmed volume mesh deformation technique to study the full transient opening dynamic characteristics of the valve. The pressure and velocity fields were obtained including the small scale flow features. The CFD results were used to analyze the upper surface average pressure, surface velocity, resultant force and displacement of the disc during opening. The inlet and outlet mass flow of the valve was in a stable state when the valve opening time was 1.43 s. Moreover, the influence of the size structural parameters on the valve opening time was studied. The simulation results compare well with test data including the shock wave during the valve opening. The results show that the geometric factors affecting the valve opening time can be modified to reduce the valve opening time. It shows that the area of the region between the relief hole (orifice D) connected to the solenoid valve and the vertical tube has the greatest influence on the valve opening time. Due to the upward movement and misalignment of the disc, the valve opening time is delayed during the operation of pressure relief valves. The conclusions of this paper provide guidance for the optimal design of safety valves.