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Analysis of Dynamic Characteristics and Performances of Vent-Relief Valve  

Jang, Je-Sun (한국항공우주연구원 발사체추진제어팀)
Koh, Hyeon-Seok (한국항공우주연구원 발사체추진제어팀)
Han, Sang-Yeop (한국항공우주연구원 발사체추진제어팀)
Lee, Kyung-Won (한국항공우주연구원 발사체추진제어팀)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.15, no.6, 2011 , pp. 70-77 More about this Journal
Abstract
A ventilation-relief valve performs as a safety-valve assembly for the liquid-propellant feeding system of space launch vehicle. This valve plays a role of relieving the vaporized propellants from propellant tanks during the filling and storing stages of propellants. Also it regulates to maintain the pressure of ullage volume of on-board propellant tanks within the safety-margin during the flight. The simulation model of ventilation-relief valve is designed with AMESim to predict and evaluate the dynamic characteristics and pneumatic behaviors of valve. To validate a valve simulation model, the simulation results of the opening and closing pressures and their operating durations of valve by AMESim analysis are compared with the results of mathematical methods. In addition, the results of internal flow simulation with FLUENT are utilized to improve the accuracy of valve-modeling. This study will serve as one of reference guides to enhance the developmental efficiency of ventilation-relief valves with the various operating conditionss, which shall be used in Korea Space Launch Vehicle-II.
Keywords
AMESim; Dynamic Characterists; Satety-valve; Oxidizer Tank; FLUENT; Pneumatic Modeling;
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