http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
강건용,이진욱,박승철,Kang, Kern-Yong,Lee, Jin-Wook,Park, Seung-Chul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.9
Engine turbulences obtained by LDV measurement near the compression TDC was analyzed by the classic turbulence theory. Turbulences were quantified by a cycle resolved analysis and processed to reveal integral time scale and length scale. Three different definitions were applied to obtain the turbulence time scales and then compared each others. The classic turbulence theory with the several assumptions for engine application proven to be very efficient for understanding engine turbulence in this study. It was found that the integral length scale is strongly affected and increased by tumble flow.
고전 난류이론에 의한 엔진 실린더내 압축말기 난류특성 해석
강건용(Kern-yong Kang) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Engine turbulences obtained by LDV measurement near the compression TDC was analyzed by the classic turbulence theory. Turbulences were quantified by a cycle resolved analysis, and processed to reveal integral time scale and length scale. Three different definitions were applied to obtain the turbulence time scales and then compared each others. Turbulence energy spectrum was also used to better understand the generation mechanism from bulk flows. The classic turbulence theory needed several asumptions to apply to engine flow and it was proven to be very efficient for understanding engine turbulence in this study.<br/>
친환경 디젤엔진용 차세대 피에조 인젝터의 구동성능 해석
이진욱(Jin-Wook Lee),강건용(Kern-Yong Kang),민경덕(Kyoung-Doug Min) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
In this study, a prototype piezo-driven injector, as a new method driven by piezoelectric energy, has been designed and fabricated based on the concept of inverse piezo-electric effect to overcome the major drawbacks of conventional solenoid-driven injector with a fixed and slow control of injection rate. The effects of an electric control between the solenoid valve and piezo-ceramic stack for injector needle's driving on the dynamic characteristics were usually investigated. We found that this piezo-electric actuator has the main advantage to drastically reducing the time of injector nozzle opening, as well to exert higher force output levels.
LPG 액상분사식 인젝터에서 후적에 의한 아이싱 특성 연구
박철웅,김창업,최교남,강건용,Park, Cheol-Woong,Kim, Chang-Up,Choi, Kyo-Nam,Kang, Kern-Yong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Since the liquid phase LPG injection(LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a dropping of LPG fuel but also icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of HC emissions. The experimental investigation was carried out on the bench test rig in this study. It was found that n-butane, that has a relatively high boiling point($-0.5^{\circ}C$), was a main species of droplet composition and also found that the droplet problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the an engine head temperature was increased, although a large amount of icing deposit was still observed in the case of $87^{\circ}C$. Also, it was observed that the icing phenomenon is improved by using anti-icing bushing.
연료분무 및 연소 2 : 디젤-열분해유 유상액 연료를 사용하는 직접분사식 디젤엔진의 연소 특성에 관한 연구
이석환 ( Seok Hwan Lee ),김태영,강건용 ( Kern Yong Kang ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
Fast pyrolysis of biomass is one of the most promising technologies for converting biomass to liquid fuels. The pyrolysis oil, also known as the bio crude oil (BCO), has been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of BCO in diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the BCO. One of the easiest ways to adopt BCO to diesel engine without modifications is the use of BCO/diesel emulsions. In this study, a diesel engine operated with diesel and BCO/diesel emulsion was experimentally investigated. Performance and emission characteristics of a diesel engine fuelled by BCO/diesel emulsion were examined.
LPG/바이오디젤 혼합연료를 사용하는 직접분사식 디젤엔진의 성능 및 배기특성에 관한 연구
이석환(Seok Hwan Lee),오승묵(Seung Mook Oh),최영(Young Choi),강건용(Kern Yong Kang) 한국가스학회 2010 한국가스학회지 Vol.14 No.1
본 연구에서는 LPG/바이오디젤 혼합연료의 직접분사식 디젤엔진 적용성에 관한 실험을 수행하였다. 특히, 혼합연료를 엔진에 적용하는 경우 엔진성능, 배출가스 (미연탄화수소, 일산화탄소, 질소산화물, 이산화탄소), 연소안정성에 대한 실험을 1,500 rpm의 엔진회전수 조건에서 수행하였다. 바이오디젤은 질량대비 20-60% 범위로 LPG에 혼합하였다. 바이오디젤을 40% 이상 혼합하는 경우 엔진은 모든 부하영역에서 매우 안정적으로 연소되었다. 바이오디젤의 혼합율이 증가할수록 혼합연료의 세탄가가 향상되어 연소시작 시점이 진각되었다. 혼합연료를 사용하면 저부하에서는 과혼합에 의한 부분연소로 인하여 THC와 CO의 배출량이 급증하였으며, NOx의 경우 저부하에서는 배출량이 디젤연료에 비해서 낮았으며 고부하에서는 더 많이 배출되었다. In this study, we experimentally investigated a compression ignition engine operated with Bio-diesel blended LPG fuel. In particular, the performance, emissions characteristics (including total hydrocarbon, carbon monoxide, nitrogen oxides, and carbon dioxides emissions), and combustion stability of a CI engine fueled with Bio-diesel blended LPG fuel were examined at 1500 rpm. The percentage of Bio-diesel in the fuel blend ranged from 20-60%. The results showed that stable engine operation was possible for a wide range of engine loads up to 40% Bio-diesel by mass. When the Bio-diesel content was increased, leading to a decrease in the lower heating value of the blended fuel, the cetane value increased, resulting in a advanced start of heat release. Exhaust emission measurements showed that THC and CO emissions were increased when using the blended fuel at low engine speeds due to partial burn from over-mixing. NOx emission was emitted less at lower loads and more at higher loads.