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예열기간중 엔진 실린더 라이너에 대한 비정상 열전달 해석
주원석(W.S.Joo),정인곤(I.G.Jung),박정규(J.K.Park),이재순(J.S.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this study, a two-dimension finite-difference model was developed to predict the temperature distribution of chamber at preheating process. The study consists of a mathematical modeling for the unsteady heat transfer in the cylinder. The temperature distribution of liner for diesel engine was analyzed and measured. The purpose of this study is to analyze temperature distribution of liner by the finite-difference method and to measure temperature distribution for each points.<br/>
직분식 디젤기관 연소실벽면의 순간 열플럭스와 열전달 계수 분포에 관한 연구
이재순(J.S.Lee),정인곤(I.G.Jung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In this study, the instantaneous temperature and heat flux on the combustion chamber walls of the direct injection mono cylinder diesel engine were measured by the instantaneous temperature probes. Instantaneous heat transfer coefficients were calculated by using the measured heat fluxes. The correlation of heat transfer coefficient on the combustion chamber could be derived, and the comparison were made with the existing correlations such as those of Woschini, Eichelberg and Nusselt etc. It is found that the values of heat transfer coefficient by this experiment are higher than those by the existing correlations.<br/>
유한요소법을 이용한 직접분사식 단기통 디젤기관 피스톤의 열응력 해석
이재순(J.S.Lee),우종헌(J.H.Woo),이응래(E.L.Lee),정인곤(I.G.Jung),안병태(B.T.An) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this study, a three-dimensional finite element model was developed for the analysis of the piston of the direct injection mono cylinder diesel engine.<br/> The model which consists of whole piston body to accommodate the eccentric bowl in the piston head. is used to calculate the operating temperature and the corresponding thermal stresses due to the thermal and mechanical loads.<br/> The following conclusion can be derived:<br/> (1) The thermal stress distribution in the piston is not critical. but at its pin hole and bowl inner surface part, the thermal stress is concentrated.<br/> (2) The stress is also generated by the fluttering motion of the piston rings.<br/>
직분식 디젤기관 연소실벽면의 순간열플럭스, 열전달 계수 및 연손실 분포에 관한 실험적 연구
이재순(J.S.Lee),우종헌(J.H.Woo),이응래(E.L.Lee),정인곤(I.G.Jung),안병태(B.T.An) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this study, the instantaneous temperature probes were developed for the experimental measurement of instantaneous surface temperature on the combustion chamber wall of the DI mono cylinder diesel engine. The instaneous temperatures and heat flux were measured on the cylinder head, piston crown and bowl parts and cylinder liner. The heat transfer coefficient and heat loss which is flowed out through the combution chamber wall could be derived through the calculation process of the measured data.<br/>
직분식 단기통 디젤기관 피스톤의 순간온도 측정에 관한 실험적 연구
이재순(J.S.Lee),이현구(H.K.Lee),강태경(T.K.Kang),우종헌(J.H.Woo),이응래(E.L.Lee),정인곤(I.G.Jung),안병태(B.T.An) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The instantaneous temperatures on the piston crown, lands and skirt were measured and analyzed, and the following conclusions can be derived ; ( i ) The linkage system was developed for the measurement of the instantaneous surface temperature of the piston. (ii) The point of crank angle which designates the maximum instantaneous temperature of one cycle varies and moves back and forth by the measuring points and engine speeds, (iii) The engine speeds, the position of the measuring points and the cooling water temperature had an effect on the instantaneous temperature amplitude. (iv) The instantaneous temperature amplitudes appeared on the piston crown, top and 2nd-land of ring, but on the parts of the 3rd-land of the ring and skirt, they didn't appear.<br/>
실린더해드 순간온도 측정에 있어서 실린더해드 벽표면에서 측정가능 깊이에 관한 실험적 연구
이재순(J.S.Lee),강태경(K.T.Kang),이현구(H.K.Lee),이종헌(J.H.Woo),이응래(E.L.Lee),정인곤(I.G.Jung),안병태(B.T.An) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The instantaneous temperature probes and data acquisition system were developed for the measurement of cylinder wall surface temperature and the temperature at the inner part beneath the surface for the direct injection mono cylinder diesel engine. The instantaneous temperature at the inner part beneath the wall was both calculated theoretically and detected experimentally and then were compared each other. The results can be summarized as followings; 1) It is found that the measurable depth for the instantaneous temperature is 0.4mm. 2) When the depth beneath the surface was increased, the crank angles to the maximum temperature were increased and also there were the attenuation of maximum temperature, mean temperature, and temperature swing. 3) The variation of temperature swing is affected more by the temperature detection positions than by the engine speeds. 4) When the calculated temperature and detected temperature were compared, the temperature by the experiment is greater than by the calculation, it is believed that the poor cooling at the inner parts by flesh inlet air compared to the amount of cooling by flesh inlet air at the surface makes the experimental temperature to be higher than the calculation. 5) The correlation of surface temperature,the temperature of the inner parts with the engine spped and measurable depth are derived<br/>