Energy loss analysis in cavitation flow of a continuous-resistance trim

Abstract

Energy loss is generated by phase transition and work done on the continuous-resistance trim (CRT) in cavitation flow. This study aims to explore an enhanced CRT design to minimize energy loss in cavitation flow. Four key parameters, specifically orifice shape, inlet velocity, aperture and tilt angle, which have been proven to impact flow in CRT, are examined using a validated numerical method to assess their effects on energy loss in cavitation flow. Furthermore, based on a parametric sensitivity study, an improved design is proposed to control cavitation and reduce energy loss. Findings indicate that changes in orifice shape notably influence the flow area and throttling effect, which are closely connected to energy loss in cavitation. A critical inlet velocity of v1/v0 = 0.5 triggers cavitation occurrence. An orthogonal design method employing L16(45) array is used to analyze the effects of apertures, resulting in the identification of a preferred group with lower energy loss. A larger tilt angle β1/β0 effectively suppresses cavitation generation and significantly decreases energy loss. Finally, an enhanced CRT design is proposed, incorporating a circular (chamfer) orifice shape, an inlet velocity of v1/v0 = 0.3, the preferred aperture group (No.1), and a tilt angle of β1/β0 = 0.66, this improved design showcases reduced energy loss compared to the original CRT design. The findings of this study have broad applications in guiding the implementation of throttling components to suppress cavitation and minimize energy loss.