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    • Visualization Experiment and Simulation Study on the Microchannel of Injector Control Valve
    DOI：10.13949/j.cnki.nrjgc.2024.05.010
    Key Words:visualization experiment  control valve  cavitation  simulation
    Author NameAffiliationE-mail
    WANG Xiaokang Merchant Marine College， Shanghai Maritime University， Shanghai 201306， China 202230110125@stu.shmtu.edu.cn 
    ZHANG Xusheng* Merchant Marine College， Shanghai Maritime University， Shanghai 201306， China xszhang@shmtu.edu.cn 
    JIN Lijia Merchant Marine College， Shanghai Maritime University， Shanghai 201306， China fhzmssmy@163.com 
    CHEN Ping College of Power Engineering， Naval University of Engineering， Wuhan 430033， China  
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    Abstract:To optimize the control valve hydraulic circuit and address the deviation in fuel injection characteristics and localized structural erosion caused by cavitation， experimental and numerical simulations were conducted on the control valve flow passages. A flow visualiztion study on the two-dimensional （2D） channels of two structural control valves under different pressure differentials by extracting equivalent 2D cross-sections of the fuel injector control valve flow passages. The results indicate that with increasing pressure differential， the flow behavior within the channels transitions from a linear non-cavitation regime to a strongly cavitated regime with stable flow rates. For the channel A， which features a throttling structure and right-angled edges on the cylindrical surface of the ball valve， cavitation inception occurrs within a pressure differential range of 6.22~9.00 MPa. Conversely， cavitation inception occurrs within a pressure differential range of 5.63~8.17 MPa for the channel B， which has no throttling structure and has rounded edges on the cylindrical surface of the ball valve. Cavitation initiation was observed first on the ball valve side at the narrowest point of the channel， followed by the sealing cone side. The localized structure of the sealing surface of the control valve significantly influences cavitation development. Simulation results from computational fluid dynamics indicate better agreement between the simulated cavitation distribution using the k-ω shear stress transport（SST） turbulence model and the Zwart-Gerber-Belamri（ZGB） cavitation model， compared to experimental observations. Minor alterations in the dimensions of the sealing surface and channel width have a significant impact on the initiation position of cavitation.
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