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극초고압 디젤충돌분무의 충돌거리 및 충돌각에 대한 분무특성 해석
정대용 ( D. Y. Jeong ),김홍준 ( H. J. Kim ),정찬문 ( C. M. Chung ),이종태 ( J. T. Lee ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.4
N/A To find suitable injection pressure, ultra high pressure impinging spray characteristics were investigated with a impinging distance and a impinging angle by using high pressure injection system. As impinging distance was increased, spray penetration was decreased but spray height was increased. For increase of injection pressure, spray penetration and spray height were increased until 2,500bar. But over this injection pressure region, the rate of increase was decreased suddenly.
안재현 ( J. H. Ahn ),김형모 ( H. M. Kim ),신명철 ( M. C. Shin ),김세원 ( S. W. Kim ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.4
N/A Constant volume combustion chamber has been designed to investigate diesel spray characteristics with Common-Rail injection system to realize high pressure injection. In this study, two methods of measurements, Schlieren shadowgraphy and Mie scattering imaging method are applied experimentally to study spray form and liquid phase zone in high pressure, high temperature conditions. Diesel fuel is injected at the point which ignited mixture gas is completely burned. The effect of injection pressure, injector hole diameter, ambient gas temperature and density are investigated experimentally.
정대용 ( D. Y. Jeong ),이종태 ( J. T. Lee ),홍기배 ( G. B. Hong ) 한국분무공학회 2002 한국액체미립화학회지 Vol.7 No.4
N/A The characteristics of free spray with ultra injection pressure was analyzed to clear the limit pressure of diesel engine. To obtain final goal, ultra high pressure injection equipment was developed, spray patterns were visualized under various ultra injection pressures. Spray penetration and spray width, volume and entrained air mass were increased with the increase of injection pressure. Sauter mean diameter and injection durstion were decreased. But over 3,000bar of ultra injection pressure region the rates of increase show almost similar and finally the reversed tendencies at 4,140bar.
정적 연소기 내 가솔린 직접 분사 시 분무 및 연소특성에 관한 연구
김경배 ( Kyung Bae Kim ),강석호 ( Seok Ho Kang ),박기영 ( Gi Young Park ),서준협 ( Jun Hyeop Seo ),이영훈 ( Young Hoon Lee ),김대열 ( Dae Yeol Kim ),이성욱 ( Seong Wock Lee ) 한국분무공학회 2012 한국액체미립화학회지 Vol.17 No.3
It is being more serious problems that the pollutant and the greenhouse gas emitted from the internal combustion engines due to the increasing demand of automobiles. To counteract this, as one of the ways has been studied, GDI type engine, which is directly injected into the combustion chamber and burns by a spark ignition that chose the merits of both gasoline engine and diesel engine, was appeared. The combustion phenomena in this GDI engine is known to contribute to combustion stability, fuel consumption reduction and reductions of harmful substances of exhaust gas emission, when the fuel spray of atomization being favorable and the mixture formation being promoted. Accordingly, this study analyzed the affection of ambient temperature and fuel injection pressure to the fuel by investigate the visualization of combustion, combustion pressure and the characteristic of emission, by applying GDI system on the constant combustion chamber. As a result, as the fuel injection pressure increases, the fuel distribution in the combustion chamber becomes uniform due to the increase of penetration and atomization. And when ambient temperatures in the combustion chamber become increase, the fuel evaporation rate being high but the penetration was reduced due to the reduction of volume flux, and confirmed that the optimized fuel injection strategy is highly needed.
직접분사식 바이오에탄올-가솔린 혼합연료의 분무 및 희박연소 특성에 관한 실험적 연구
박기영 ( Gi Young Park ),강석호 ( Seok Ho Kang ),김인구 ( In Gu Kim ),임철수 ( Cheol Soo Lim ),김재만 ( Jae Man Kim ),조용석 ( Yong Seok Cho ),이성욱 ( Seong Wock Lee ) 한국분무공학회 2014 한국액체미립화학회지 Vol.19 No.3
As a demand for an automobile increases, air pollution and a problem of the energy resources come to the fore in the world. Consequently, governments of every country established ordinances for green-house gas reduction and improvement of air pollution problem. Especially, as international oil price increases, engine using clean energy are being developed competitively with alternative transportation energy sources development policy as the center. Bio ethanol, one of the renewable energy produced from biomass, gained spotlight for transportation energy sources. Studies are in progress to improve fuel supply methods and combustion methods which are key features, one of the engine technologies. DI(Direct Injection), which can reduce fuel consumption rate by injecting fuel directly into the cylinder, is being studied for Green-house gas reduction and fuel economy enhancement at SI(Spark Ignition). GDI(Galoine Direct Injection) has an advantage to meet the regulations for fuel efficiency and CO2 emissions. However it produces increased number of ultrafine particles, that yet received attention in the existing port-injection system, and NOX. As fuel is injected into the cylinder with high-pressure, a proper injection strategy is required by characteristics of a fuel. Especially, when alcohol type fuel is considered. In this study, we tried to get a base data bio-ethanol mixture in GDI, and combustion for optimization. We set fuel mixture rate and fuel injection pressure as parameters and took a picture with a high speed camera after gasoline-ethanol mixture fuel was injected into a constant volume combustion chamber. We figured out spraying characteristic according to parameters. Also, we determine combustion characteristics by measuring emissions and analyzing combustion.
강민석 ( Minseok Gang ),김학진 ( Hak-jin Kim ),김동욱 ( Dong-wook Kim ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2
원예 작물의 생육 지표로 사용되는 생체중, 건물중, 높이, 엽면적, 직경은 증산 및 광합성과 밀접한 관계가 있고, 이러한 생육 지표는 작물 생산성을 정량화하여 최적의 환경, 양분, 관수 제어 전략을 수립하는데 활용될 수 있다. 따라서 정확한 생육 지표 측정은 매우 중요하지만, 생육 지표를 측정하기 위한 전통적인 방법은 파괴적이고 인적 자원을 많이 필요로 하여 시간과 비용 소모가 클 뿐만 아니라, 시료의 채취 방법이나 시료 상태에 따라 신뢰성이 떨어질 수 있다. 생육 지표 측정에는 정확성 뿐만 아니라 작물 성장 단계별 양액의 변량 공급을 위해 실시간으로 작물의 생육 정도를 측정하는 기술 또한 필요하다. 최근 딥러닝 기술의 발전으로 3차원 영상 데이터를 이용한 합성곱 신경망과 같은 기술이 도입되고 있어 생육 센싱을 비롯한 분야에서 농업 적용성이 높아지고 있다. 본 연구에서는 RGB 채널과 깊이 정보를 이용하여 4개 품종 상추의 생체중, 건물중, 높이, 엽면적, 직경을 예측할 수 있는 합성곱 신경망 기반 모델을 개발하고, 예측 성능을 구명하였다. 사용된 재료는 2021년 6월 바게닝긴대학교 주최 온라인 인공지능 경진대회에서 제공한 상추 데이터이며, 해당 데이터는 인텔 Realsense D435 카메라를 이용하여 수집된 상추의 RGB와 깊이 정보이다. 선행 연구에서 개발한 자동 3D 영상 데이터 수집 시스템 및 모니터링 시스템을 개선하여 합성곱 신경망 모델 적용이 가능하도록 하였으며, 측정 항목별 합성곱 신경망 예측 모델의 측정 성능을 분석한 결과 예측 모델은 결정계수 0.9 이상의 정확도를 나타냈으며 모니터링 시스템에서 이미지 하나당 평균 150 ms의 처리 속도를 나타내어 실시간 생육 지표 예측 가능성을 보였다.