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김창업(Changup Kim),오승묵(Seungmook Oh),강건용(Kernyong Kang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The liquid phase LPG injection (LPLi) system (the third generation technology) has been considered as one of the next generation fuel supply systems for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type(the second generation technology) fuel supply system. To investigate the characteristics of core part of liquid phase LPG injection system with various properties of LPG fuel, injector durability test were performed. The experimental results showed that no problem in durability test using favorable LPG fuel property, while a injector showed high leakage amount using LPG fuel with highly containing olefin species.
LPG액상 분사 연료공급 시스템에서 얼음형성과 혼합기의 온도 저하
이범호(Beomho Lee),성범모(Beommo Seong),조승환(Seunghwan Cho),이대엽(Daeyup Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Development of an LPG fuel supply system with liquid injection technology is very promising for reducing the exhaust emission to meet the stringent emission regulations, and to enhance the engine performance. When an LPG fuel is injected, due to its large heat of vaporization the temperature of an injector's tip decreases significantly, which causes an icing phenomenon. In this work, a thermodynamic model was developed to understand the icing phenomenon with the LPLi(Liquid phase LPG injection) fuel supply system.
LPG 액상분사식 인젝터 분사팁의 아이싱 발생 특성 연구
박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi),강건용(Kernyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The use of clean gaseous fuel for the purpose of high efficiency and low emission in automotive engines has tendency of increase in order to meet the reinforcing emission regulations and to efficiently utilize limited natural resources. Since the liquid phase LPG injection (LPLI) system has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type fuel system, automotive companies developed and commercialized it. However, when a liquid LPG fuel is injected into the inlet duct of an engine, a large quantity of heat is extracted due to evaporation of fuel. This leads to freezing of the moisture in the air around the outlet of a nozzle, which is called icing phenomenon. It may cause damage to the outlet nozzle of an injector or inlet valve seat. This research examines the characteristics of icing phenomenon and also aimed to improve it through the use of anti-icing bushing at the fuel injection tip. The result showed that the icing phenomenon and process were mainly affected by humidity and temperature of inlet air in the inlet duct. Also, it was observed that the icing phenomenon improved by using aluminum bushing whose end matches the end of fuel injection tip in length.
부탄과 프로판 혼합비율에 따른 액상 LPG 분사시 Icing 특성
김영진 ( Yung Jin Kim ),조원준 ( Won Joon Cho ),이기형 ( Ki Hyung Lee ) 한국액체미립화학회 2011 한국액체미립화학회지 Vol.16 No.3
LPG(Liquified Petroleum Gas) fuel for vehicles has lots of advantages such as low emission level, cheaper fuel cost and enough infrastructure. Therefore it arouses interest as an alternative engine to reduce emission of diesel engines. Especially MPI(Multi Point Injection) type LPLi(Liquid Phase LPG injection) system could have overcome the disadvantages of mixer types such as low engine performance, decreased charging efficiency and cold starting difficulty. However ice formation on the nozzle tip and intake port due to the freezing of moisture around the components is often observed in LPLi systems. This icing phenomenon is the direct cause of unstable engine combustion, resulting in engine emissions. Therefore in this research, a spray visualization test for LPG injection was carried out to obtain the basic information of an LPLi injector, then the effects of butane and propane mixing rates on ice formation at the intake port and nozzle tip was investigated. As a result, the icing characteristics of them showed contrary results according to the mixing rates.
Top-Feed Type 인젝터의 LPG 액상분사 적용성
염기태(Kitae Yeom),박정서(Jungseo Park),장진영(Jinyoung Jang),문석수(Seoksu Moon),배충식(Choongsik Bae),박정남(Jeongnam Park),김성근(Sungkun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The injection and spray characteristics of Top-feed type injector was investigated under liquid phase injection fueled with liquefied petroleum gas (LPG). Different pressures and temperatures of fuel injection system were tested to identify the injection characteristics after hot soaking. MIE-scattering technique was used for verification of successful liquid phase injection after hot soaking. In case of Bottom-feed type injector, the injection was accomplished at every experimental condition. In case of Top-feed type injector, when the pressure of LPG was over 12 bars, the injection was not executed. The effects of temperature of fuel on fuel injector were little. However, under the pressure were 12 bars, the liquid phase injection after hot soaking was accomplished.
자동차용 LPG 외장형 펌프의 연료 조성에 따른 특성연구
남덕우(Deokwoo Nam),김창업(Changup Kim),박철웅(Cheolwoong Park),최교남(Kyonam Choi),임종한(Jonghan Lim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Liquid Phase LPG Injection(LPLi) system is a 3rd fuel supply system which could be possible to satisfy the regulation of exhausted gas. However, because LPG has a high vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels, fuel supply system including LPG pump have mechanical trouble. It can cause the deterioration of durability and problems of the maintenance of the LPG pump. In this research, we developed an external-type LPG pump which has the advantage of the price competitiveness and the convenient maintenance for LPLi system. The experiments were carried out in order to assess characteristics of the external-typed fuel pump at different fuel composition compared with internal-typed LPG pump.
황인구(In Goo Hwang),명차리(Cha-Lee Myung),김성근(Sungkun Kim),박심수(Simsoo Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This study is focused on the nano particle emission characteristics from a side mounted GDI (Gasoline Direct Injection) and LPG-DI (Liquefied Petroleum Gas Direct Injection) engine and vehicle. The fuel supply system of commercial GDI vehicle is reworked to a return type liquid phase LPG fuel injection system. The LPG tank with low pressure BLDC pump and pressure regulator were installed in the test vehicle. Engine operation variables of GDI engine were calibrated to optimal value for LPG fuel. Nano-particle number concentration from the GDI and LPG-DI engine were analyzed with DMS500. Regulated emission (THC, CO, CO₂, NOx) and nano particle number concentration from GDI and LPG-DI vehicle were analyzed of vehicle certification mode.
LPLi 인젝터의 아이싱 (icing) 특성에 관한 실험적 연구
서영호 ( Young Ho Seo ),권석주 ( Seok Joo Kwon ),박성욱 ( Sung Wook Park ),박수한 ( Su Han Park ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
최근 자동차 배기가스에 의한 환경오염과 석유자원 고갈에 따른 에너지 효율 향상 및 대체 에너지 개발의 필요성이 대두되고 있으며, 대체에너지를 적용한 자동차 엔진 개발은 중요한 이슈이다. LGP (Liquefied Petroleum Gas) 연료는 가솔린을 대체할 수 있는 청정연료로서 많은 연구 개발이 진행되어 적용단계에 이르고 있다. 그러나 LGP 는 디젤 및 마솔린에 비해 낮은 기화온 도를 갖고 있어 아이싱 (icing) 현상이 발생하게 된다. 아이싱은 LGP 연료가 액상으로 분사된 후 압력변화에 의한 상 변화 (액상→기상)시 연료의 기화 잠열에 의한 주위 온도 강하로 분사노즐부가 냉각되고 공기 중의 수증기가 응결하여 인젝터 팁 부근에 결정을 형성하는 현상을 말한다. 이러한 아이싱 현상은 인젝터 분사 특성에 영향을 주게 되며,엔진 출력에 악영향을 주게 되어 방지팁을 이용한 아이싱 방지가 필수이다. 본 연구에서는 일체형 동 재질의 아이싱 방지팁을 이용하여 분사주기, 분사기간 습도, 연료압력에 따른 아이싱 특성을 실험적으로 관찰하였다.또 한 이중 중공 구조의 방지팁을 제작하여 일체형 방지팁과 비교하였다. 일체형 동 재질의 방지팁의 경우 동일한 습도 및 연료압력 조건에서 분사기간이 증가함에 따라 온도 강하의 폭은 작아졌으며, 분사주기가 짧아질수록 온도강하의 폭은 커지는 것으로 관찰되었다. 온도 강하 폭의 증가는 동일 조건에서 결빙현상이 발생할 가능성이 커지는 것을 의미한다. 분위기 습도가 높아지는 경우 온도변화가 크지 않아 결빙생성에 대한 습도의 영향은 크지 않은 것으로 판단되었다.액상 LGP 의 분사압력이 높아질수록 온도저하 폭이 작은 것으로 관찰되었는데 이것은 압력이 높을수록 액상 연료의 분출속도가 증가하여 인젝터팁 부근보다 하류지점에서 연료가 기화하기 때문인 것으로 판단된다.한편, 아이싱 방지팁을 같은 재질(동)을 이용하여 이중 중공 형태로 제작하였을 경우 일체형 보다 온도강하 폭이 작은 것으로 관찰되었다. 이는 팁 내부에 비어있는 단열층 공간의 영향인 것으로 판단된다.
LPG연료 조성비에 따른 터빈방식 LPi용 연료펌프의 성능 및 엔진적용특성에 관한 연구
임무창(Mu-Chang Lim),최성원(Seong-Won Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),박정남(Jeong-Nam Park),김성근(Sung-Kun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
BLDC type fuel pump for Liquified Petroleum injection (LPi) system has complicated structure and expensiveness. So in this study turbine type fuel pump made simple structure is possible as a substitute for BLDC type fuel pump, which was tested. This study shows that flow rate and fuel injection of turbine type fuel pump were equivalent or better performance comparing to BLDC type fuel pump. And as the turbine type fuel pump was equipped in the LPG fuel tank, possibility of mass production was founded for the noise characteristic. Also engine performances with respect to the pump change were equivalent or better than BLDC.
제3세대 LPLI 엔진 연소실내 스월유동 및 희박연소 특성 해석
강건용,이진욱,Kang, Kern-Yong,Lee, Jin-Wook 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.1
The intake swirl motion, as one of dominant effects for an engine combustion. is very effective for turbulence enhancement during the compression process in the cylinder of 2-valve engine. Because the combustion flame speed is determined by the turbulence that is mainly generated from the mean flow of the charge air motion in intake port system. This paper describes the experimental results of swirl flow and combustion characteristics by using the oil spot method and back-scattering Laser Doppler velocimeter (LDV) in 2-valve single cylinder transparent LPG engine using the liquid phase LPG injection. For this. various intake port configurations were developed by using the flow box system and swirl ratios for different intake port configurations were determined by impulse swirl meter in a steady flow rig test. And the effects of intake swirl ratio on combustion characteristics in an LPG engine were analyzed with some analysis parameters that is swirl ratio. mean flow coefficient, swirl mean velocity fuel conversion efficiency. combustion duration and cyclic variations of indicated mean effective pressure(IMEP). As these research results, we found that the intake port configuration with swirl ratio of 2.0 that has a reasonable lean combustion stability is very suitable to an $11{\ell}$ heavy-duty LPG engine with liquid phase fuel injection system. It also has a better mean flow coefficient of 0.34 to develope a stable flame kernel and to produce high performance. This research expects to clarify major factor that effects on the design of intake port efficiently with the optimized swirl ratio for the heavy duty LPG engine.