Influence of flashboard location on flow resistance properties and internal features of gate valve under the variable condition

Abstract

This article is intended to elaborate different inlet velocities that respectively are 13 m/s,15 m/s and 17 m/s to influence flow resistance characteristics and the internal flow characteristics of gate valve in the medium-low pressure gas transmission. This paper presents the CFD analysis of flow resistance characteristics and the internal flow characteristics of gate valve in a gate valve with different inlet velocity. Gate valves under different inlet velocity have eight relative opening degrees that respectively are 1/8, 2/8, 3/8, 4/8, 5/8, 6/8, 7/8 and 1. For every relative opening degree of gate valve structure, the systematic CFD simulations of flow resistance, pressure fluid, velocity fluid, velocity streamline and pressure coefficient characteristics. The study mainly analyses the pressure field distribution, velocity distribution, the velocity streamline distribution when the relative opening degree is 1/8, 2/8 and 1. Experimental measurements are also conducted for flow resistance characteristics and then compared with simulated flow resistance results. The CFD simulated flow resistance results show a good agreement with that of experimental flow resistance based on the Reynolds Stress Model (RSM) turbulence model provided by fluent software. Through analysis of flow resistance properties and internal flow characteristics, we concluded that it is not stable before the relative opening degree 2/8 that the valve flow resistance characteristics and internal flow characteristics, which need to be optimized; however, the valve flow resistance characteristics and flow characteristics gradually can be gradually stabilized after the relative opening degree 2/8, and does not have the characteristics of regulating valve. In the process of gas transmission, pressure energy loss mainly occurs in the valve core.