연료의 점도 변화를 고려한 글로브 밸브 내부 유동 시뮬레이션

Fuel flow simulation in globe valve considering variation of viscosity

Valves are devices used to control or stop the flow of fluids through pipelines. Among them, globe valves with a movable disk or plug experience a significant pressure drop due to the changes in fluid flow direction from horizontal to vertical and back to horizontal. This study analyzes the flow characteristics and cavitation in a globe valve, focusing on the effects of varying fuel viscosity due to changes in pressure and temperature. Simulations were conducted with IFO 380 fuel under constant and variable viscosity conditions. The Realizable k-ε model was applied, and cavitation was simulated through multiphase flow conditions. Results showed that at a 50% valve opening, significant pressure drops and cavitation occurred in narrow regions, while at 100%, pressure changes were more gradual. The WLF-Barus model revealed that higher pressures increased fuel viscosity, reducing cavitation compared to constant viscosity conditions. Flow coefficient (Kv) calculations showed minor differences between constant and variable viscosity, with the variable condition leading to a lower Kv at full valve opening. The study highlights the impact of viscosity changes on flow resistance and cavitation behavior.