• Title, Summary, Keyword: 디젤기관

Search Result 691, Processing Time 0.044 seconds

발명 & 경제

  • (사)한국여성발명협회
    • The Inventors News
    • /
    • no.24
    • /
    • pp.7-7
    • /
    • 2004
  • 디젤의 디젤기관 - 스키토의 뜀틀 - 플림톤의 롤러스케이트 - 멀티 스위치

  • PDF

A Study on the Response Performances under Transient Operating Conditions in a Turlblocharged Diesel Engine (터보과급 디젤기관의 과도운전시 응답성능에 관한 연구)

  • 최낙정;이창식
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.16 no.8
    • /
    • pp.1575-1582
    • /
    • 1992
  • This study describes the response performances of actual engine speed, turbocharger speed, air mass flow rate through engine, boost pressure ratio, exhaust temperature and combustion efficiency for a six-cylinder four-stroke turbocharged diesel engine during the change in operating conditions by using the computer simulation with test bed. In order to obtain the transient conditions, a suddenly large load was applied to the simulation engine with the several kinds of inertia moment in turbocharger and engine, and engine set speed. From the results of this study, the following conclusions were summarized The inferior response performances was mainly caused by turbocharger lag, and air mass flow rate and boost pressure ratio were closely related to the turbocharger speed. A reduced moment of turbocharger inertia resulted in less transient speed drop and much faster recovery to the steady state of the engine. The increase of moment of engine inertia reduced cyclic variation of engine speed. When a large load was applied to the engine at high speed, the engine could be fastly recovered. However, when the same load was applied to the engine at low speed, the engine was stalled.

A Study on a Simulation of a Fuel Injection System in a Large Low-Speed Marine Diesel Engines (박용 대형 저속 디젤기관 연료분사계통의 시뮬레이션에 관한 연구)

  • 강정석;이창식;조권회;최재성
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.24 no.6
    • /
    • pp.43-52
    • /
    • 2000
  • In this study, a simulation program was developed, which could simulate a fuel injection system for low-speed marine diesel engine. The fuel injection system was divided into fuel injection pump, high pressure pipe and fuel injection valve. The unsteady flow in the high pressure injection pipe was analyzed by the method of characteristics, considering cavitation and variation of fuel density and bulk modulus. It was confirmed that the simulation results were good agree with experimental results of injection pressure and quantity at the high pressure distributor in fuel injection system for the training ship "M/V Hannara". And the effects of the atomizer hole diameter, maximum needle lift, plunger diameter and nozzle opening pressure were also investigated with simulating results.g results.

  • PDF

The Characteristics on the Engine Performance, Smoke and NOx Emission for Variation of Fuel Injection Timing in an IDI Diesel Engine Using Biodiesel Fuel (IDI 디젤기관에서 바이오디젤유 적용시 분사시기변화에 따른 기관성능과 매연 및 NOx 배출 특성)

  • Choi, Seung-Hun;Oh, Young-Taig
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.16 no.4
    • /
    • pp.75-80
    • /
    • 2008
  • Biodiesel fuel(BDF) can be effectively used as an alternative fuel in diesel engine. However, BDF may affect the performance and exhaust emissions in diesel engine because it has different physical and chemical properties from diesel fuel such as viscosity, compressibility and so on. To investigate the effect of injection timing on the characteristics of performance and exhaust emissions with BDF in IDI diesel engine, it was applied the BDF derived from soybean oil in this study. The engine was operated at seven different injection timings from TDC to BTDC $12^{\circ}CA$ and six loads at a single engine speed of 1500rpm. When the fuel injection timing was retarded, better results were showed, which may confirm the advantages of BDF. The simultaneous reduction of smoke and NOx was achieved at some fixed fuel injection timings of an IDI diesel engine.

An Experimental Study on Application of Biodiesel Fuel in Direct Injection Diesel Engine (직접 분사식 디젤기관에서 바이오디젤유의 적용에 관한 실험적 연구)

  • Oh, Y.I.;Choi, S.H.
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.818-823
    • /
    • 2001
  • Because the exhaust emissions from automobiles are increased, our environment is faced with very serious problems related to the air pollution in these days. In particular, the exhaust emissions of diesel engine are recognized main cause which influenced environment strong. Lots of researcher have been attempted to develop various alternative fuel on purpose to reduce these harmful emissions. In this study, the potential possibility of esterfied rice bran oil which is a kind of biodiesel fuel was investigated as an alternative fuel for diesel engine. And, we tried to analysis not only total hydrocarbon but hydrocarbon components from $C_1$ to $C_6$ in exhaust gas using gas chromatography to seek the reason for remarkable reduction of exhaust emission. Individual hydrocarbon$(C_1\simC_6)$ as well as total hydrocarbon of biodiesel fuel is reduced remarkably than that of diesel fuel in this experiment.

  • PDF

A Study for Characteristics of Performances and Exhaust Emission on Blending Rates of Biodiesel Fuel in a Common-Rail Injection Diesel Engine (커먼레일 분사방식 디젤기관에서 바이오디젤유의 혼합율에 따른 성능 및 배기배출물 특성 연구)

  • Choi, S.H.;Oh, Y.T.
    • Journal of the Korea Society For Power System Engineering
    • /
    • v.10 no.2
    • /
    • pp.5-10
    • /
    • 2006
  • Our environment is faced with serious problems related to the air pollution from automobiles in these days. In particular, the exhaust emissions of diesel engine are recognized main cause which influenced environment strong. In this study, the potential possibility of biodiesel fuel was investigated as an alternative fuel for a naturally aspirated common rail diesel engine. The smoke emission of biodiesel fuel 30vol-%(max. content) was reduced in comparison with diesel fuel, that is, it was reduced approximately 60% at 4000rpm, full load. But, power, torque and brake specific energy consumption didn't have no large differences. But, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel.

  • PDF

Application of Biodiesel Fuel and EGR Method in an IDI Diesel Engine (간접분사식 디젤기관에서 바이오디젤유 및 EGR 방법 적용)

  • Choi, Seung-Hun;Oh, Young-Taig
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.17 no.3
    • /
    • pp.62-67
    • /
    • 2009
  • In this study, the potential possibility of biodiesel fuel was investigated as an alternative fuel for a naturally aspirated indirect injection diesel engine. The smoke emission of biodiesel fuel was reduced remarkably in comparison with diesel fuel, that is, it was reduced approximately 36% at 2000rpm, full load condition. And, power, torque and brake specific energy consumption showed no significant differences. However, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel. Also, the effects of exhaust gas recirculation(EGR) to reduce the NOx emission has been investigated. It was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel(20vol-%) and cooled EGR method$(10{\sim}15%)$.

A Study on the Reduction of NO Emission from a Diesel Engine with 2-Stage Type Combustion Chamber (2단 연소형 연소실을 갖는 디젤기관의 NO 저감에 관한 연구)

  • 진선호;배종욱
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.26 no.5
    • /
    • pp.554-564
    • /
    • 2002
  • A newly designed combustion chamber of diesel engine with a modified piston crown was prepared for the purpose of investigation for reduction of NO emission. It was intended to realize 2-stage combustion that is to keep fuel rich condition during early stage of combustion and fuel lean condition during next stage. The engine was tested on various conditions concerning exhaust gas emissions especially about NO emission and simultaneously fuel consumption rate. It was found that the engine with 2-stage combustion type piston emits significantly low NO at various speed and torque compared with conventional engines, but it raised points at issue in CO and smoke emissions with fuel consumption rate. The increasing of injection pressure on 2 stage combustion type diesel engine affects on CO and smoke emission considerably to reduce but slightly on NO to increase. The effect of 2-stage combustion was better at low speed than at high speed.

A Study on Effect of EGR upon Fuel Consumption Rate and NOx Emission in Diesel Engines (디젤기관의 연료소비율 및 질소산화물 배출물에 미치는 EGR의 영향에 관한 연구)

  • Bae, M.W.;Lim, J.K.
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.3 no.1
    • /
    • pp.76-88
    • /
    • 1995
  • The effects of exhaust gas recirculation(EGR) on the characteristics of NOx emissions and specific fuel consumption rate have been investigated using an eight-cylinder. four cycle. direct injection diesel engine operating at several loads and speeds. The theoretical NO formation concentration is calculated with the equivalence ratio as a parameter of flame temperature to study the effect of EGR on NOx emissions in the diesel combustion. The experiments in this study are conducted on the fixed fuel injection timing of $38^{\circ}$ BTDC regardless of experimental conditions. It is found that the specific fuel consumption rate is slightly increased with EGR rate. and NOx emissions are markedly reduced owing to the drop of the incoming oxygen concentratio and the increase of equivalence ratio as the EGR rate increases.

  • PDF