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RISS 인기검색어
- 검색키워드
- 주제어 : Penta-Control Coolant Valve(PCCV:5방향 유량제어밸브) (검색결과 2 건)
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100kw급 수소전기차용 열관리시스템의 최적제어를 위한 통합유량제어밸브의 수치모델 검증
정수진(Soo-Jin Jeong),문성준(Seong-Joon Moon),최지현(Ji-Hyun Choi),강지훈(Jihoon Kang),이검수(GumSu Lee) 한국자동차공학회 2022 한국자동차공학회 지부 학술대회 논문집 Vol.2022 No.5
The ever growing importance of effective and efficient thermal management will no doubt benefit the quest for more efficient fuel-cell vehicle. Therefore, delicate electrical based cooling system enhanced functionalities are in high demand. To meet such demand, an ICCV(integrated coolant control valve) which will replace the former wax thermostat has been developed. Analysis of cooling system at initial phase of product development will help in optimum design of the system and better performance of engine. Hence, 1D (one dimensional) simulation tools place a major role. The aim of this study is to validate several thermodynamic and 3D CFD models of Penta-Control Coolant Valve in terms of accuracy and cost-effectiveness by comparing each models. PCCV was numerically modeled based on junction and chamber with 1D pipes and its prediction performance is validated by the results of 3D CFD simulations. The results show that thermodynamic models produced very large discrepancies ranging from 30% to 150% in case of large opening area of stack port because of strong three-dimensional turbulence effect. From the results of this study, it is found that thermodynamic models is not able to reflect the complex three dimensional flow characteristics in PCCV leading to a erroneous pressure drop and flow distribution in case of large opening area of stack port.
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움직임 격자법을 이용한 100kW 수소연료전지 자동차용 5방향 냉각수 제어밸브의 비정상 동적 내부 유동특성 해석
정수진(Soo-Jin Jeong),문성준(Seong-Joon Moon),이검수(GumSu Lee),강지훈(Jihoon Kang) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
The aim of this study is to investigate dynamic flow characteristics of the fluid flow through Penta-Control Coolant Valve by comparing to steady state CFD simulation. To achieve this goal, the present paper attempts the dynamic simulation of the fluid flow through PCCV using a commercial CFD solver with moving mesh technique. Firstly, dynamic flow characteristics and the energy loss inside the PCCV ball valve during the opening and closing process was analyzed. It is found that the discrepancies between dynamic and steady state simulation is larger when the rotating degree is in ranging from 40 to 50 degree, while the fluid resistance is very small at the rest of the degree. Then, the dynamic flow characteristics of the PCCV ball valve at different spool rotational speeds were investigated. It is found that the velocity value and the flow turbulence are gradually increased when the spool rotational speed increases from 94 deg/s to 47 deg/s. It is also founded that faster rotating speed of ball valve leads to larger discrepancies between dynamic and steady CFD simulation in terms of accuracy of mass flow prediction. Finally, dynamic thermal mixing characteristics during the valve opening and closing process with different rotating velocity were analyzed. It is found that the difference between dynamic and steady simulation is increased with increasing rotating speed. It is helpful for the design of ball valves opening strategy and the improvement of the whole FCEV thermal management system.
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