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터보과급 대형 CNG기관 피스톤의 온도분포와 열응력 해석
김양술(Yang Sul Kim),안수철(Su Chul An) 한국가스학회 2008 한국가스학회지 Vol.12 No.4
본 연구에서는 직렬 6기통 압축천연가스 엔진의 피스톤에 대한 3차원 모델링을 수행하여 정상상태에서의 온도분포 및 그에 따른 열응력과 변형을 예측하고, 이를 기존의 해석결과와 비교 검토를 통하여 피스톤의 유한요소해석의 기준을 구축하고자 한다. 또한 냉각시스템의 성능이 피스톤의 열부하에 미치는 영향을 평가하기 위하여 냉각수 온도의 변화에 따른 피스톤의 온도분포 및 열응력 분포 그리고 그에 따른 변형을 분석하였다. 분석결과 피스톤의 최고 온도는 크라운부의 중앙에서 나타났고, 피스톤의 크라운 하부에서 최대 열응력이 발생하였다. The purpose of this paper is to establish a standard finite element analysis model of a piston by carrying out three dimensional modeling of a series six-cylindered CNG engines piston to forecast temperature distribution at stationary state and the following thermal stress and variation, and cross checking it with existing analysis. Also, in order to evaluate the affects of the cooling system to the piston’s heat load, the paper analyzed pistons temperature and thermal stress distribution according to the cooling water temperature changes and the following variations. As a result, the maximum temperature was found at the center of the crown in the piston and the maximum thermal stress occurred from the lower part of the piston.
점화플러그 삽입위치와 PDA 밸브를 이용한 가솔린엔진의 배출가스에 대한 실험적 연구
김대열(Dae-Yeol Kim),한영출(Young-Chul Han),김양술(Yang-Sul Kim) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.4
The purpose of this study is to investigate variation of spark plug protrusion and PDA valve on the exhaust emission in a gasoline engine. Swirl is one of the important parameters that affects the characteristics of combustion. PDA valve has been developed to satisfy requirements of sufficient swirl generation for improving the combustion and reducing of emission level. Also, especially, the variation of spark plug protrusion have an important effect to the early flame propagative process. This is largely due to the high flame speed by short of flame propagation distance. So, this is forced that injection timing, spark timing and intake air motion govern the stable combustion. As a result, using two combustion chamber, without charge of engine specification and the variable spark plug location and PDA valve could be reduced exhaust gas at a part load engine conditions(1500rpm imep 3.9bar, 2000rpm imep 3.2bar, 2400rpm imep 3.9bar).
디젤엔진 배기매니폴드 열ㆍ유동해석을 통한 운동특성에 관한 연구
한승창(Seung-Chang Han),이상훈(Sang-Hoon Lee),김양술(Yang-Sul Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
OEM Exhaust Manifold is made by casting, and it is designed to withstand large amount of exhaust resistance and the length of each exhaust pipe is not uniform. In this study, the shape, material, and 리ow characteristics of exhaust manifold is tried to be optimized by increasing the power through numerical experiments using STAR-CD. And the results of this study arc expected to be used as important data when CAE analysis for increasing the life and efficiency of the exhaust system is performed.
金鐘億,金良述 弘益大學校 1989 弘大論叢 Vol.21 No.2
A new generation of computer-based methods is emerging for calculating the detailed patterns of gas flow, heat transfer and combustion in reciprocating engines by solving numerically the governing partial-differential conservation laws of physics. Attempt to identify the reasons for inadequated knowledge of the velocity components and other quantities in the inlet aperture during the intake stroke. The comparisons are shown between no rib and two rib on the inlet pipe wall. Turbulent flows in an axisymmetric inlet pipe are also estimated. k-εturbulence model is adopted and the law of the wall is applied at grid-points near the wall. Two-dimendional calculations are presented of the air flow in a model engine motored at engine comprised at 200rpm with a compression ratio of 3. The program resonabley simulates flow patterns throughout the suction stages of the reciprocating engine.