제어밸브용 오리피스형 다단 트림의 형상이 압력강하와캐비테이션 특성에 미치는 영향

초록

A control globe valve with multi-stage trim is commonly used to avoid cavitation and choked flow in power plant systems. This work investigated geometric effects of the multi-stage trim on the hydralic performance of the control valve by using experimental and numerical analyses. Three-dimensional Reynolds-averaged Navier-Stokes analysis was performed with the finite volume method, and a grid dependency test and turbulence model test were implemented. Closed-loop experimental apparatus was constructed to investigate Reynolds number effects on the performance characteristics. Number and thickness of the orifice stages and vertical distances between orifice holes were selected as the geometric parameters. As the performance parameters, the pressure loss coefficient, the incipient cavitation coefficient and the pressure recovery factor were selected to evaluate the performance of the orifice-type anti-cavitation trim.

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