• Title/Summary/Keyword: Disel engine

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An Experimental Study on Emission Reduction by Low Sulfur Diesel Fuel in Diesel Oxidation Catalyst of Heavy Duty Diesel Engine (대형디젤기관의 디젤산화촉매장치에서 저유황 경유에 의한 배출가스 저감에 관한 실험적 연구)

  • 요용석;강호인;한영출
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.3
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    • pp.138-142
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    • 1998
  • Among aftertreatment devices which reduce exhaust gas of diesel engine, diesel oxidation catalyst(DOC) with high reduction efficiency for gaseous matter and particulate matter is now being studied actively. In this study, an experiment was conducted to analyze the effects of low sulfur diesel fuel in heavy duty diesel engine equipped with DOC. We tested to estimate change of engine performance for the low and high sulfur diesel fuels in a 11,000cc diesel engine equipped with DOC. We conducted test to estimate the reduction efficiency of exhaust gas in D-13 mode of heavy duty diesel regulation mode and in smoke opacity mode for two samples of high sulfur content (0.2%) and low sulfur content(0.05%)

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An Analytic Method of Combustion Characteristics in a Single-Cylinder Type Disel Engine (단기통형 디젤기관의 연소특성 분석방법)

  • Cho, H.K.
    • Journal of Biosystems Engineering
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    • v.17 no.1
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    • pp.5-17
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    • 1992
  • To develop an analytic method of combustion characteristics in a small sized and single cylinder type diesel engine for a power tiller, 1) the theoritical analysis of combustion gas in engine cylinder was performed based on thermoscience and 2) the computer program which could be used to calculate those values of the apparent burning rate, the heat loss, the gas temperature and the fuel-air equivalence ratio with the experimental cylinder pressure data, was developed. This method would provide the practical and quantative data for the diesel combustion process. Through the use of this method, following details would be obtained: 1) the application in the modeling of combustion process without detail knowledeg of combustion process, 2) the basis for the complete modeling of diesel engine, and 3) the basic information for the design of combustion chamber by the prediction of engine performance.

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A Study on the Estimation of Exhaust Emission by Nonroad Construction Equipments (비도로용 건설기계의 오염물질 배출량 산정에 관한 연구)

  • 정일록;엄명도;류정호;임철수
    • Journal of Korean Society for Atmospheric Environment
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    • v.15 no.3
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    • pp.317-325
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    • 1999
  • The demand of diesel engine on the construction equipment has been rapidly increased because of high thermal efficiency and fuel economy. The exhaust emission from nonroad vehicles equipped with diesel engine such as construction equipment, ship, and agricultural equipment, etc. Which are known to be harmful to human health and environment, has not been regulated in our country. But the regulation for nonroad vehicle has been already progressed in advanced country. So we investigated the contribution ratio of air pollution by construction equipment in order to establish the exhaust emission management strategy for nonroad vehicle. Based on the statistical data for construction equipment, 5 kinds of equipment are selected and tested in the engine dynamometer to determine the emission factor. And the amount of air pollutant from construction equipment are calculated by using of the emission factor and recommended exhaust emission standard for construction equipment.

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A Study on the Feasibility Test & the Performance Experiment of Small Type Diesel Engine using the an Rice-bran oil (미강유적용 소형 디젤기관의 타당성 검증 및 성능실험에 관한 연구)

  • Yu, B.G.;Cha, K.O.;La, W.J.;Chung, J.D.
    • Journal of ILASS-Korea
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    • v.2 no.3
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    • pp.44-50
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    • 1997
  • Bio-diesel oil is a great possibility to solve the pollution problem caused by the exhaust gas from diesel engine vehicles. Recently the use of bio-oils in disel engines has received considerable attention to the forseeable depletion of world oil supplies. So, Bio-diesel oil has been attracted with attentions as an alternative and clean energy source. The objective of this paper is to experimentally investigate the characteristic of performance using light oil, rice-bran oil, heated rice-bran oil, rice-bran oil treated with ultrasonic energy. We included rice-bran oil and applied ultrasonic energy to highly viscous bio-oils. These methods seems to have never been tried yet. The final data may be able to be applicated for the design of the diesel engine using an alternative fuel.

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Analysis of Performance Characteristics on Diesel Engine with Aftertreatment and EGR System (후처리 시스템을 장착한 디젤엔진의 EGR 밸브 작동에 따른 성능 분석)

  • Park, Cheol-Woong;Choi, Young;Lim, Gi-Hun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.5
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    • pp.124-129
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    • 2010
  • The direct injection (DI) diesel engine has become a prime candidate for future transportation needs because of its high thermal efficiency. However, nitrogen oxides (NOx) increase in the local high temperature regions and particulate matter (PM) increases in the diffusion flame region within diesel combustion. Therefore, the demand for developing hybrid system consist of exhaust gas recirculation (EGR) and aftertreatment system as well as diesel particulate filter (DPF) or lean NOx trap (LNT) should be applied. The variation of EGR rate due to the malfunction of EGR valve can affect not only the combustion stability of engine but also the performance of aftertreatment system. In this research, 2.0 liter 4-cylinder turbocharged diesel engine was used to investigate the combustion and emission characteristics for various operating conditions with EGR. While the fuel consumption was increased with increase of EGR rate, NOx emission was improved by maximum 90% at low speed, low load operating condition. To achieve combustion stability and reliability of aftertrearment system with minimum penalty in fuel consumption and emissions, the fault diagnosis of EGR malfunction must be employed.

An Experimental Study on Exhaust Gas Reduction of Diesel Oxidation Catalyst by CVS-75 Mode in Light Duty Diesel Engine (小型디젤機關에서 CVS-75 모드에 따른 디젤 酸化觸媒裝置의 排出가스 低減에 關한 實驗的 硏究)

  • 한영출;김종춘;오용석
    • Journal of Korean Society for Atmospheric Environment
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    • v.15 no.4
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    • pp.457-461
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    • 1999
  • Recently, increasing usage of diesel vehicle, many countries try to reduce the pollutant materials by emission regulation standard. Particularly, in our country, the supplement ratio of diesel vehicle is high, and air pollution by particulate matter(PM) is very serious. So, in theoretical study wer analyzed the formation principle of gaseous emission and PM, the characteristics of CVS-75 mode. In experimental study, we tested exhaust gas reduction of emission and PM, the characteristics of CVS-75 mode. In experimental study, we tested exhaust gas reduction of disel oxidation catalyst(DOC) by CVS-75 mode in light duty diesel vehicle. In case of an automobiletest with the 2,956cc diesel engine which DOC was equipped, CVS-75 mode which is similar to driving conditions on the road was chosen as the restrictive mode of light duty diesel automobile in our country. According to the Pt, the reduction rate of exhaust emission was estimated with using 0.1% high sulfur fuel and 0.05% low sulfur fuel.

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Numerical analysis on the characteristics of disel spray for variation of injection spray angle and swirl ratio. (분사각 및 스월 변화에 따른 디젤분무의 특성에 관한 수치 해석)

  • Jung H.;Cha K. S.;Park C. G.
    • Journal of computational fluids engineering
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    • v.5 no.3
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    • pp.1-7
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    • 2000
  • In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporation, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a D.I engine for variation of spray angle and swirl ratio.

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Performance and Emissions Characteristics of a Diesel Engine with Some Bio-oil Fuels (몇가지 바이오 연료를 이용한 디젤기관의 성능 및 배기 배출물 특성)

  • 나우정;조기현
    • Journal of Biosystems Engineering
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    • v.25 no.6
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    • pp.471-480
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    • 2000
  • 대체연료로서 바이오 연료의 디젤엔진에의 적합성을 파악하기 위하여 경유, 가온 미강유, 초음파 적용 가온 미강유, 미강유 메틸 에스테르, 폐식용유, 초음파 적용 폐식용유, 폐식용유 메틸 에스테를 14kW 예연소실식 디젤 엔진의 연료로 사용하여 그 성능과 배기배출물을 측정하였다. 시험에 사용한 바이오 연료들에 의해 엔진 분사 펌프의 조정이나 다른 부품의 개조를 하지 않고도 단기간 전부하 상태로 1,600~2,800 rpm 의 범위에서 엔진은 정상적으로작동하였다. 바이오 연료를 사용하였을 경우 전반적으로 엔진성능과 배기 배출물 특성에 있어서 경유를 사용하였을 경우와 비견할만 하였으며 특히 매우 낮은 농도의 $SO_2$와 매연을 배출하였다.

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Flow Analysis of Water Pump for Clean Disel Engine Application (클린 디젤엔진용 워터펌프 유동해석)

  • Lee, Dongju;Kim, Taeyoung;Chon, Mun Soo
    • Journal of Institute of Convergence Technology
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    • v.4 no.2
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    • pp.61-65
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    • 2014
  • Pressure distribution around rotating impeller blades in centrifugal pump has been main issue for design of efficient and high performance automotive water pump. In addition, pressure losses of inlet water pipes should be considered to reduce additional pressure drop and design high performance engine cooling system. In this paper, pressure distribution inside water pump and pressure drop between inlet and outlet of water pump are investigated numerically to design plastic water pump for clean diesel engine application. And the inlet geometry of water pump was considered to analysis the effect of inlet water pipe geometry on pressure distribution around impeller blades and outlet pressure. The prediction results are compared with experimental data to validate and determine optimal operation condition without water pump cavitation. Major design parameters such as blade angle, volute geometry, system pressure, and coolant flow rate are considered to confirm applying possibility of plastic blades to the clean diesel engine.