Numerical Simulation of the Working Process in a Safety Valve with Additional Gas-Dynamic Coupling

Raeder T., Tenenev V.A., Koroleva M.R.

Abstract


Gas dynamic processes in the spring-type safety valve with the additional gas-dynamic coupling between the valve volume and the environment are investigated. When the valve is opening gas flows from the vessel, it is accompanied by filling the operating volume with rising the pressure over the disk. It leads to appearing the opposed force and unstable disk movement. Decreasing this pressure will allow for providing the stable valve operation. The additional gas-dynamic coupling can help to stabilize the valve operation because a part of the gas is discharged through narrow gaps and the disk pressure decreases. The gaps may take the form of cylindrical or coaxial channels. Gas flows into such channels are two-dimensional. The reduction of the computation load for numerical calculation of the spatial problem of safety valve operation can pass on to a simplified task for gas flows through gaps. In this work the possibility of using 1D task statement for finding gas characteristics in narrow channels is estimated.

The algorithm with preliminary calculations of gas parameters in connecting channels based on one-dimensional differential equations of viscous gas flow in narrow gaps is proposed. This algorithm allowed us to determine the relationship between the valve specific force and the disk lift when two cylindrical channels are used to reduce the pressure over the disk. It was shown that the additional gas-dynamic coupling provides a stable operating mode of the safety valve, while the absence of gas discharge can lead to the unstable oscillating mode of the disk motion.

Keywords


safety valve, gas-dynamic coupling, viscous gas, narrow gaps, numerical modeling, Godunov scheme

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DOI: http://dx.doi.org/10.22213/2410-9304-2020-3-118-126

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ISSN 1813-7911