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박경택(K. T. Park),박태조(T. J. Park),강병루(B. R. Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A highly sensitive pressure regulator is required in natural gas vehicle(NGV), which are widely provided throughout the land, to maintain a constant outlet pressure regardless of inlet pressure. Successful operation and higher performances of a high pressure gas fuel management system requires complete understanding of the flow and temperature characteristics inside the regulator. In this paper, the computational fluid dynamics(CFD) code, FLUENT is adopted to investigate gas flow characteristics to design a new high performance regulator. Detailed pressure, velocity vector and temperature distributions are obtained for various inlet supply pressures and valve opening ratios. Small valve opening for high inlet pressure results in higher pressure and temperature drops under Joule-Thomson effects. Therefore the results of present study can be used in designing of a new CNG regulator.
CNG 차량의 연료주입라인용 Check Valve내의 유동해석
여경모(K. M. Yeo),박태조(T. J. Park),정희택(H. T. Chung),송명길(M. G. Song),강병루(B. R. Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A check valve which adopted in high pressure fuel supply line of natural gas vehicle (NGV) prevents the reverse flow from gas tanks installed in the vehicle and leakage. It is reported that the flow passages of poppet are sometimes blocked by seat seal at the very instant of charging line connection with regulator so results in charging failure. In this paper, the computational fluid dynamics(CFD) code FLUENT are adopted to investigate detailed gas flow characteristics inside the valve and verified a reason of the seal departure problem.
CNG를 주입중인 Receptacle내의 유동특성 해석
여경모(K. M. Yeo),박경택(K. T. Park),박태조(T. J. Park),송명길(M. G. Song),강병루(B. R. Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In natural gas vehicle(NGV), there reported many problems for receptacle which is the most important component in fuel supply line. The perch which supported by a spring inside the receptacle are seriously worn out and poppet and other components are fractured. In this paper, the computational fluid dynamics (CFD) code, FLUENT are adopted to analyze detailed gas flow characteristics and investigate the failure reasons. The results showed that unequal rotational gas flows are occurred around perch legs and these make the component to rotate and finally results in excessive friction and wear. Based on these compressed natural gas(CNG) flows and assembled component shapes, highly improved new receptacle is designed and manufactured.
CNG차량 연료공급라인의 Check Valve용 Seal의 해석
유재찬(J. C. Yoo),여경모(K. M. Yeo),박태조(T. J. Park),송명길(M. G. Song),강병루(B. R. Kang) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
CNG(Compressed natural gas) fuel supply line whose main components are receptacle and check valve are necessary to charge high pressure gas to the tank of NGV(Natural gas vehicle). In this paper, in order to investigate the reasons of seal departure form valve seat and blockage of gas flow within check valve, the MARC software is used to solve the non-linear problem. Deformed seal shapes are obtained for various amounts of seal interference and its location, and gas charging pressure. The results showed that the reasons of seal departure problems are verified and suggested a new design method.