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이광주(Kwangju Lee),이종구(Jonggoo Lee),이종민(Jongmin Lee),이종태(Jongtai Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The power of a hydrogen-fueled engine higher than gasoline had been disturbed by backfire. Therefore, in order to get the power of higher than gasoline engine level in a hydrogen-fueled SI engine, the change in the valve timing and the effect of the lean boosting are analyzed. As the results, the exhaust valve closing timing is not worked on backfire control, but the intake valve opening timing is worked. In addition, it is confirmed that the power of higher than gasoline engine level and NOx-free are achieved by lean boosting. This value are obtained under 2.1bar and Φ=0.3.
수소-공기 예혼합 압축착화 기관의 운전영역 확장을 위한 흡기 온도 증가에 관한 연구
이광주(Kwangju Lee),김용락(Yongrak Kim),이종구(Jonggoo Lee),이종태(Jongtai Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In order to expand the operation region for the compression ignition with hydrogen-air pre-mixture, the operation region, characteristics of combustion and performance were analyzed by increasing intake temperature. As the results, in the case of increasing intake temperature, the minimum compression ratio for possible compression ignition was predictably decreased by increasing temperature of initial compression due to increasing intake temperature. In addition, Fuel-air equivalence ratio expand for Φ=0.54 when intake temperature increase at 100℃. This result is expanded two times than room temperature. But, it was analyzed that difference of real supply energy hardly increased than expansion of equivalence ratio due to increasing intake temperature.
흡기밸브 열림 시기에 의한 흡기관분사식 수소기관의 역화억제
이광주(Kwangju Lee),Huynh Thanh Cong,강준경(Joonkyoung Kang),이종태(Jongtai Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to certify the control of back-fire in the hydrogen-fueled engine with external mixture by intake valve timing, the characteristics of combustion are experimentally studied with change of intake valve opening timing at the fixed exhaust valve closing timing. As the results, when the intake valve opening timing is retarded, back-fire limit equivalence ratio is increased, and as expected, back-fire does not occurred from TDC. In addition, the timing of the best performance without back-fire is shown when the exhaust valve closing timing is 10° ATDC and the intake valve opening timing is TDC.
이광주(Kwangju Lee),김용락(Yongrak Kim),허상훈(Sanghun Hur),이종태(Jongtai Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In order to develop a compression ignition H₂ engine operated under neat hydrogen-air pre-mixture and room temperature conditions, as the first step, the variable compression ratio hydrogen research engine that has higher compression ratio more than 40 was developed in this study. Feasibility of the compression ignition by using high compression ratio, also, was grasped. As the results, it was shown that neat hydrogen-air of ultra lean mixture(equivalence ratio equal to 0.22) is spontaneously ignited at compression ratio 26 which is lower than estimated one without any assist method for promoting self-ignition but has narrow operating regions for equivalence ratio.
흡기관 분사식 수소기관에서 고부하시 NOx 감소 가능성에 관한 연구
이광주(Kwangju Lee),허상훈(Sanghun Hur),이종태(Jongtai Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In order to grasp the possibility of achieving low NOx and high performance without backfire in a hydrogen-fueled engine using external mixture injection at high load, the effects of increasing the boosting pressure were analyzed in terms of combustion characteristics, and performance enhancement. As the results, it was found that the achievement of low emission(NOx of less than 20 ppm), high power(equal to that of a gasoline engine) and high efficiency(around 36.7%) without backfire in a hydrogen-fueled engine is possible around a boosting pressure of 1.5 bar at an equivalence ratio of Φ=0.35.
이광주(Kwangju Lee),허상훈(Sanghun Hur),김용락(Yongrak Kim),이종태(Jongtai Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In order to grasp the possibility of simultaneously achieving ultra low NOx, high power and high efficiency without backfire in a hydrogen-fueled engine using external mixture injection at high load, as early step the effects of low temperature combustion were analyzed in terms of backfire occurrence, knock and performance enhancement. As the results, it was found that the achievement of backfire control by retarding IVO, high power(above a gasoline engine) and high efficiency(around 37.5%) in a hydrogen-fueled engine is possible around a boosting pressure of 1.7 bar at an equivalence ratio of Φ=0.4.
이광주(Kwangju Lee),임성한(Sung-Han Rhim),황종욱(Jong Wook Hwang),정용운(Yong Wun Jung),양계병(Gyaebyung Yang) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.12
가스터빈 엔진 블레이드의 신뢰성을 해석하였다. 항복강도, 탄성계수, 엔진속도 및 기체온도를 서로 독립적인 확률변수로 가정하였다. 파손확률을 구하기 위하여 사용한 방법들 중에서 Advanced Mean Value Method가 가장 효율적임을 알 수 있었다. 동일한 평균과 표준편차를 갖는 정규, 대수정규 및 Weibull 분포로 확률변수 형상을 가정하였을 경우, 극한상태방정식의 누적분포함수는 확률변수 분포형상에 의하여 큰 영향을 받지 않음을 알 수 있었다. 확률변수의 표준편차에 대한 파손확률의 민감도는 기체온도의 경우에 가장 크다는 것을 알 수 있었다. 확률변수의 평균과 표준편차의 효과를 검토하였다. 기체온도의 평균과 엔진속도의 표준편차의 증가가 파손확률을 가장 크게 증가시킴을 알 수 있었다. The reliability of gas turbine engine blades was studied. Yield strength, Young’s modulus, engine speed and gas temperature were considered as statistically independent random variables. The failure probability was calculated using five different methods. Advanced Mean Value Method was. the most efficient without significant loss in accuracy. When random variables were assumed to have normal, lognormal and Weibull distributions with the same means and standard deviations, the CDF of limit state equation did not change significantly with the distribution functions of random variables. The normalized sensitivity of failure probability with respect to standard deviations of random variables was the largest with gas temperature. The effect of means and standard deviations of random variables was studied. The increase in the mean of gas temperature and the standard deviation of engine speed increased the failure probability the most significantly.