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이상열(Sangyul Lee),장서윤(Seoyun Jang),박원아(Wonah Park),박철웅(Cheolwoong Park) 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.7
연료 분사 모듈은 대표적인 중소기업 아이템 중의 하나이나, 대부분의 업체들이 체계적인 설계기술 및 설계 tool을 확보하고 있지 못한 실정이다. 연료 분사 모듈 설계에 사용되는 기존 상용 설계 및 해석 프로그램은 고비용과 전문성의 한계로 인해 중소기업에서 활용하기 힘든 측면이 있다. 이런 이유로, 국내 노즐 업체들이 쉽게 사용할 수 있는 연료 분사용 노즐 설계/해석 tool 개발의 필요성이 제기되고 있다. 본 연구는 연료분사모듈 설계 프로그램용 코드 구조를 개발하고 플랫폼 연동용 input/output 코드를 개발하는 것을 연구 목표로 하였다. 오픈소스 3D 연소해석 프로그램인 KIVA의 서브루틴을 분석한 후 분사 모듈 개발에 필요한 코드를 개발하고, 기존 코드 및 실험결과와 비교, 검증하였다. Fuel injection module is one of the representative small and medium enterprise items, but most companies do not have systematic design technology and design tool. The existing commercial design and analysis programs used in fuel injection module design are difficult to utilize in SMEs due to their high cost and limited expertise. For this reason, there is a need to develop fuel injection nozzle design / analysis tool which domestic nozzle manufacturers can easily use. The purpose of this study is to develop code structure for fuel injection module design program and to develop input / output code for platform linkage. After analyzing the subroutines of KIVA which is an open source 3D combustion simulation program, we developed the code necessary to develop the injection module and compared it with the results of the old code and experiments.
부분 예혼합 압축착화 연소를 위한 다단 분사 및 피스톤 보울 형상에 관한 연구
이상열(Sangyul Lee),박원아(Wonah Park),민경덕(Kyoungdoug Min) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
To reduce diesel engine emission, partially homogeneous charge combustion ignition diesel engine with split injection was simulated. Some conditions compared to the conventional injection strategy were evaluated and soot was reduced but NOx was not. Due to the early injection, pressure and temperature in the piston is low and spray was collided to the piston liner, combustion was poor and HC and CO would be increased. To eliminate the collision, retarded the injection timing and modified the bowl geometry and NOx and soot is reduced a bit quantity. At last, piston bowl was modified for spray reentrance. In this results, NOx and soot was enomously reduced..
이상열(Sangyul Lee),민경덕(kyoungdoug Min) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Simulation results are able to provide the insights of engine cylinder. Generally, chemical mechanism of n-heptane is used as a fuel of engine combustion, because diesel fuel consists of hundreds of chemical components and various chemical classes and it is very complex and huge to use to the calculation. In this study, n-dodecane was used as a representative fuel to describe the heavy molecular weight of diesel oil (C10~C20). We added and modified some reactions based on the reduced high-temperature n-dodecane chemical mechanism and developed a new reduced diesel surrogate chemical mechanism with the basic mechanism consists of iso-octane and toluene. In addition, reactions of diacetylene and naphthalene were added to describe the processes of soot formation. The ignition delay times of the new reduced diesel surrogate chemical mechanism were well matched to the experimental data. This reduced diesel surrogate chemical mechanism would be used to the engine simulation well due to the small number of reaction and species.
김용구,이상열,김한나,노학재,봉춘근,김대성,Kim, Yonggu,Lee, Sangyul,Kim, Hannah,Noh, Hakjae,Bong, Choonkeun,Kim, Daesung 한국입자에어로졸학회 2015 Particle and Aerosol Research Vol.11 No.2
The purpose of this research is to find out the collection property of nanoparticle in diffusion filter to know particle size dispersion of nanomaterial using inertial force and principle of Brownian diffusion motion. We used inertial filters which are two different type and diffusion filters made by various kinds of Wiremesh and the different pieces of filter to compare with particle size distribution using NaCl particles. Finally, We made a conclusion as follows : (1) the bigger available charging volume is and the larger specific surface area of inertial filter is, the better collection efficiency is. (2) The higher wire-mesh number of filter is, the more collection efficiency of small particle is increasing because the wire of the higher Wiremesh number filter is thinner and denser. (3) The more pieces of wire-mesh filter, the more collection efficiency is increasing because it makes the residence time longer.