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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/>
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.
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.
RSSV 소기시스템 장착을 이용한 2행정 대젤엔진 개발
조규백(Gyu B.Cho),강건용(Kern Y.Kang),정용일(Young I.Jeong) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
A 2-stroke diesel engine has been developed by using theㆍRSSV system which was proven to be efficient scavenging system in a dynamic simulator experiment. A 4-stroke engine with 2-valve and 4-cylinder was modified into a 2-stroke engine with 4-walve and 2-cylinder. The developed prototype 2-stroke engine was tested to confirm the performance of the RSSV system in various conditions and compared with the scavenging system without the RSSV. It was found that the RSSV system could effcetively increase the scavenging efficiency and eventually the engine power higher in the 2-stroke engine than in the 4-stroke engine.<br/>
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.
Eulerian-Lagrangian 다상 유동해석법에 의한 피에조 인젝터의 노즐 내부 비정상 캐비테이션 유동해석
이진욱 ( Jin Wook Lee ),민경덕 ( Kyung Duk Min ),강건용 ( Kern Yong Kang ),( M. Gavaises ),( C. Arcoumanis ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.4
N/A This study describes the analysis results of unsteady cavitating flows behavior inside nozzle of the prototype piezo-driven injector. This piezo-driven injector has been recognised as one of the next generation diesel injector due to a higher driven efficiency than the conventional solenoid-driven injector. The three dimensional geometry model along the central cross-section regarding of one injection hole has been used to simulate the cavitating flows for injection time by at fully transient simulation with cavitation model. The cavitation model incorporates many of the fundamental physical processes assumed to take place in cavitating flows. The simulations performed were both fully transient and `pseudo` steady state, even if under steady state boundary conditions. We could analyze the effect the pressure drop to the sudden acceleration of fuel, which is due to the fastest response of needle, on the degree of cavitation existed in piezo-driven injector nozzle