Abstract
In this study, using LNG as a working gas, computational fluid dynamics(CFD) was performed on a blowdown depressuring system; then, a design guide program(DGP) which can be used in the initial design of the system was developed and validated. The physical phenomena occurring in the gas vessel, blowdown valve(BDV), restriction orifice(RO), diverging pipeline, and long pipeline, which are the main components of the system, were analyzed. Especially, it was confirmed that a supersonic flow was generated during the operation time of the system, and oblique shock waves and a terminal shock wave were generated inside the system. Therefore, in the DGP, the quasi-one-dimensional compressible flow formula that can reflect the physics of supersonic flow was used as the governing equation, and the Fanno flow equation was used to simulate the long pipeline flow. The DGP was validate by comparing with CFD results, and it is expected to shorten the initial design time by quickly deriving the pressure, temperature, and Mach number results of each major components.
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