ICONE23-1366 TRANSIENT FLOW RESISTANCE ANALYSIS OF INTEGRATED VALVE

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  • Sun Xinming
    Institute of Nuclear and New Energy Technology, Tsinghua University
  • Qin Benke
    Institute of Nuclear and New Energy Technology, Tsinghua University
  • Xu Xingxing
    Institute of Nuclear and New Energy Technology, Tsinghua University
  • Bo Hanliang
    Institute of Nuclear and New Energy Technology, Tsinghua University

抄録

The control rod hydraulic driving system (CRHDS) is a new type of built-in control rod drive technology. Integrated valve (IV) is the main control unit of the whole system. Transient flow resistance of IV is the key parameter of the transient flow analysis of the CRHDS which lays the base for the vibration reduction research of the CRHDS. The structure and working principles of IV are introduced. Different flow channels are formed when the IV core piston moves to different positions during the valve shutting off or opening process. The IV differential pressures corresponding to varied inlet flow velocities were obtained through modeling and calculating different flow channels. Flow fields of the IV are discussed. The change of flow resistance coefficient of the valve opening process was found. The resistance coefficient combined with the dynamic model of valve core opening process and the water hammer equations of CRHDS result in the dynamic pressure of the IV transient flow test loop. The calculation results agree well with the experimental results and the validity of the transient resistance model is proved. Through sectional division of the flow channels, the pressure drop between different sections along with the change of the piston position was obtained and the main flow resistance part of the IV was also found. The results provide solid basis for the design and optimizing of the IV. The control rod hydraulic driving system (CRHDS) is a new type of built-in control rod drive technology based on the hydraulic control rod driving system (HCRDS) and the commercial PWR magnetic jack (Bo, 2005). The CRHDS is composed of circulating pump, filter, integrated valve (IV) and driving mechanism in which the IV is the main control unit of the whole system. The pulse water entering into the driving mechanism controlled by the IV drives the pin claw move so as to achieve the step up, step down and scram function. The IV is a direct action solenoid valve. Because of its fast opening and closing operation, there is an obvious transient flow process in the hydraulic drive circuit. This process combined with the working process of the hydraulic cylinder will cause high pressure pulsation in the circuit. It affects the normal operation of the pump and brings pipe vibrations and noise. Therefore, it is necessary to study the transient flow of the drive system caused by the IV operation. The IV steady state flow resistance (Cai, 2008; Qin, 2010) and electromagnetic force (Liu, 2011) have been analyzed experimentally and theoretically in recent years. The IV transient flow process is the main work of this paper. Transient flow resistance of IV is the key parameter of the transient flow analysis of the CRHDS. The structure and working principles of IV are presented. The flow field of the valve core of different working positions is analyzed by FLUENT. The change of flow resistance coefficient of the valve opening process is obtained. The flow resistance coefficient as a boundary condition combined with the water hammer equations of CRHDS result in the dynamic pressure of the IV transient flow test loop. The calculation results are validated by the experimental results. On this basis, the flow resistance during IV opening process is analyzed which provides guidance for the IV design and optimization.

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