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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.
여경모(K. M. Yeo),박경택(K. T. Park),박태조(T. J. Park),정희택(H. T. Chung),강병루(B. R. Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
At some compressed natural gas(CNG) stations, water vapor in the fuel or ambient air has created problems such as icing in check valve and receptacle during fueling. In this paper, the computational fluid dynamics(CFD) code, FLUENT are adopted to analyze the detailed gas flow and temperature characteristics to investigate the icing problem. The results showed that the icing phenomena during fueling can be occurred in check valve and receptacle and explained by Joule-Thomson effects. And the numerical temperature distributions are well in accordance with observed phenomena. Therefore the numerical methods can be used in designing of check valve and receptacle to overcome icing problems.
CNG차량의 연료공급라인용 Check Valve Seal의 거동해석
유재찬(Jae-Chan Yoo),여경모(Kyeong-Mo Yeo),박태조(Tae-Jo Park),강병루(Byeong-Roo Kang) 한국트라이볼로지학회 2006 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.22 No.6
In CNG (Compressed natural gas) fuel supply line, whose main components are receptacle and check valve are used to charge high pressure gas to the tank of NGV (Natural gas vehicle). It is reported that the seal is separated occasionally form valve seat and results in blockage of gas flow. In this paper, MARC is used to investigate the reasons of seal separation and suggest design improvements. The static gas pressure distributions acting on the seal which calculated using FLUENT are considered to investigate accurate seal deformation behaviors. Deformed seal shapes are obtained for various amounts of seal interference and its location, gas pressure distributions and Young's modulus of the rubber used. The results showed that the reasons of seal separation problems are verified theoretically, and suggested examples of new design method. Therefore the present numerical methods can be applied in designing and performance analysis of rubber seals adopted in high pressure fluid machineries.
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.
수소자동차의 연료주입라인용 Check Valve 내의 유동해석
박경택(Park, Kyong-Taek),여경모(Yeo, Kyeong-Mo),박태조(Park, Tae-Jo),강병루(Kang, Byeong-Roo) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The high pressure hydrogen gas refueling system is required for fuel cell vehicle. In this paper, a commercial computational fluid dynamics (CFD) code, FLUENT is adopted to investigate the gas flow characteristics inside the check valve for various refueling and tank pressures. The results showed that the choking phenomena can occur for certain refueling pressures, therefore refueling processes should be divided by multiple stages. And a design method to prevent the seal departure problem which reported in CNG usages is required.