• Title, Summary, Keyword: 디젤기관

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Experimental Study on Combustion Characteristics of Biodiesel Waste Cooking Oil in Marine Diesel Engine (선박디젤기관에서 바이오디젤 폐식용유의 연소특성에 대한 실험적 연구)

  • Cho, Sang-Gon
    • Journal of the Korean Society of Marine Engineering
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    • v.39 no.4
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    • pp.381-386
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    • 2015
  • Environmental pollution and alternative energy has attracted increasing interest. The use of diesel engines is expected to increase in the world owing to their fuel economy. The problem of air pollution emissions from marine engines is causing a major concern in many areas. An alternative fuel was introduced as an environmentally friendly fuel to reduce the toxic emissions from conventional fossil fuels. Biodiesel fuel, which is a renewable energy is highlighted as environmentally friendly energy. This energy can be operated in regular diesel engines when it is blended with invariable ratios without making changes. In this study, a bio-diesel fuel was produced from waste cooking oil and applied to a marine diesel engine to examine the effects on the characteristics of combustion. Waste cooking oil contains a high cetane number and viscosity component, a low carbon and oxygen content. As a result, the brake specific fuel consumption was increased, and the cylinder pressure, rate pressure rise and rate of heat release were decreased.

Effects of the Combustion and Emission Characteristics in a CRDI Engine Biodiesel Blended Fuel with and EGR rate (커먼레일 디젤기관에서 바이오디젤 혼합 연료와 EGR율이 연소 및 배기특성에 미치는 영향)

  • Yoon, Sam-Ki;Choi, Nag-Jung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.6
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    • pp.3383-3388
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    • 2014
  • An experimental study was performed to compare the characteristics of the combustion pressure and exhaust emissions in the case of using pure diesel when the EGR rate was changed in a CRDI 4-cylinder diesel engine with those using biodiesel blended and pure diesel fuel. In this study, the EGR rate variation were conducted at an engine speed of 2000rpm with fuel with a biodiesel blended rate of 20%. The combustion pressure of the biodiesel blended rate 20% and pure diesel fuels decreased with increasing EGR rate. The IMEP of biodiesel was higher than that of ULSD (Ultra low sulfur diesel). The emission results showed that the NOx emission of biodiesel blended fuel with increasing EGR rate was higher than that of ULSD. In addition, the NOx emission of biodiesel blended and diesel fuel decreased with increasing EGR rate. The CO and soot, $CO_2$ emissions increased with increasing EGR rate, and the CO and soot emissions from the biodiesel blended fuel were lower than that of ULSD but the $CO_2$ emissions were higher.

Study on induction air swirl in D.I. diesel engine (직접분사식 디젤기관의 흡입공기 선회강도에 대한 고찰)

  • 고춘식
    • Journal of the korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.16-22
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    • 1987
  • 직접분사식 디젤기관의 성능과 배기가스 문제에 여향을 주는 실린더 내에서의 연소형태는 크게 연료분사계와 흡입공기 유동계 두 가지에 의해 결정된다. 즉 분사율, 부사시기, 분무형태와 같은 분사계의 특성과 공기선회, 스퀴시(squish), 난류와 같은 공기 유동 특성에 의하여 연소형태가 결 정된다. 이러한 복잡한 연소형테를 기관 특성에 맞게 조정한다는 것은 대단히 어려운 문제인데 이것은 연료화 공기의 혼합이 연소실형상과 흡기계의 형상에 큰 영향을 받으며 연료가 액체 상 태로 연소실내로 들어와 분무과정을 통하여 증발이 되어야만 연소가 가능하기 때문이다. 특히 흡입공기 유동계에 있어서 현재의 직접 분사식 대젤기관의 흡입구 형상은 흡입공기의 운동에너 지에 모멘트를 가하여 연소실내에서 공기의 선희(swirl)를 발생시켜 줌으로써 연료와 공기의 혼 합기를 형성시키는 Helical type이 많이 이용되고 있다. 그러나 기관 성능과 배기가스 특히 NOx는 상반관계를 이루기 때문에 연소실내로 들어오는 흡입공기의 선희강도(swirl ratio)를 너무 강하게만 한다고 하여 좋은 결과를 얻을 수는 없다. 따라서 설계하고자 하는 각 기관에 있어서 요구되는 성능과 배기가스 문제를 만족하는 흡입공기의 선희강도가 얻어질 수 있도록 흡입구 형상을 설계한다는 것은 많은 연구와 경험이 요구되고 있다. 본 자료에서는 직접분사식 디젤기 관에 있어서 흡입공기의 최적 선희강도에 대한 설정방법과 흡입구 형상 설계를 위한 설계 이론 및 정상류 Rig test상에서의 흡입공기 선희강도의 평가방법을 소개하고자 한다.

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A Study on the Optimun Speed Measurement for the Speed Control of a Diesel Engine (디젤기관의 속도제어를 위한 최적회전수 측정에 관한 연구)

  • 유영호
    • Journal of the Korean Society of Marine Engineering
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    • v.21 no.5
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    • pp.579-583
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    • 1997
  • A diesel Engine rotates vibratively because of alternative explosion strokes. Traditional measurement of a diesel engine speed is carried out by measuring output voltage of FV convertor from input signals of MPU(magnetic pickup unit) or of DC tachometer. Because these measurement include also vibrative rotation of a diesel engine, an analog filter is often used to eliminate high frequency noises due to periodic explosion stroke. But by this method these high frequency noises do not eliminated effectively because noise frequencies are changed according to diesel engine speed. In this paper, author proposes a new measurement method of a diesel engine revolution which read digital signal directly from MPU and prove the utility of proposed method through the real experiment.

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Effect of Fuel Injection Timing on the Performance and Exhaust Emissions in IDI Diesel Engine Using Biodiesel Fuel (바이오디젤유를 사용하는 디젤기관에서 연료분사시기 변화에 따른 기관성능 및 배기배출물 특성)

  • 유경현;오영택
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.2
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    • pp.76-82
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    • 2004
  • Biodiesel fuel(BDF) which is easily produced from vegetable oils such as soybean oil and rice bran oil can be effectively used as an alternative fuel in diesel engine. However, BDF can affect the performance and emissions in diesel engine because it has different chemical and physical properties from diesel fuel. To investigate the effects of injection timing on the characteristics of performance and emissions with BDF in IDI diesel engine, BDF derived from rice bran oil was considered in this study. The engine was operated at six different injection timings and six loads at a single engine speed of 2000rpm. When the injection timing was retarded, better results were obtained, which may confirm the advantage of BDF. The reduction of NOx and smoke was observed for a 2$^{\circ}$ retarded injection timing without any sacrifice of BSEC.

Utilization of fish oil as an alternative fuel for diesel engine (디젤기관용 대체연료로서의 어유 이용)

  • 서정주;왕우경;안수길
    • Journal of the korean Society of Automotive Engineers
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    • v.18 no.2
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    • pp.64-71
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    • 1996
  • 내연기관은 19세기에 발명되어 20세기에 이르는 약 100여년에 걸쳐 계속 발달하여, 오늘날은 육.해.공의 각종 원동기로 사용되어 인간생활에 없어서는 안될 중요한 위치를 차지하고 있다. 사용연료는 거의가 액체연료인 석유계가 대부분을 차지하고 있고, 이의 수요가 날로 증가됨으로써 석유자원의 고갈 위기와 함께 유해성 배출가스의 방출에 기인되는 환경오염의 측면에서도 매우 심각한 문제로 대두되고 있다. 따라서 종래의 석유계 연료로부터 탈피하여 값싸고 장기적으로 안정하게 고급될 수 있는 대체연료 개발과 에너지 절약기술에 대한 다각적인 연구가 전 세계적으로 확산되고 있다. 이러한 대체연료는 단순히 가격면에서 뿐만 아니라 장기적 공급이 가능해야 하고 또한 석유자원의 고갈과 비상시의 대비를 위한 관점에서도 취급되어야 할 것으로 본다. 이러한 관점에서 어유는 어류의 자원이 고갈되지 않는 한 생산이 계속 가능하므로 대체연료로서의 이용가치를 검토할 필요가 있다고 본다. 따라서, 본 해설에서는 디젤기관용 대체연료로서 가격이 싸고 공급이 비교적 용이한 정어리유(sardine oil)를 경유와 여러비율로 혼합한 경유-어유 혼합유를 정용연소기와 선박용 디젤기관에 사용하여 그 연소특성을 기존의 경유 사용시와 비교 설명하고자 한다.

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Comparison of combustion characteristics between esterified and non-esterified bio-diesel oil on CRDI diesel engine with turbocharger (전자 제어 분사식 과급디젤기관에서 에스테르화와 비에스테르화 바이오 디젤유의 연소 특성 비교)

  • Lee, Sang Deuk;Jung, Suk Ho
    • Journal of the Korean Society of Marine Engineering
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    • v.37 no.1
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    • pp.53-58
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    • 2013
  • In order to judge that non-esterified soybean oil could be used on diesel engine with electronic control of fuel injection system, The test of combustion performance using only gas oil, gas oil blended with esterified bio-diesel oil 5% and non-esterified soybean oil 5% were carried out. It is noticed that most performances of gas oil blended with esterified bio-diesel oil 5% and non-esterified 5% have similar characteristics but non-esterified bio-diesel oil 5% emitted smaller NOx, resulting from fuel NO.

A Study on Establishment of Criteria to Identify the Defense Industrial Technology of Diesel Engine for Military Vehicle (군용차량을 위한 디젤기관의 방산기술 식별기준 정립에 관한 연구)

  • Yoon, Heung-Soo;Ryu, Yeon-Seung
    • Journal of the Korea Convergence Society
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    • v.10 no.3
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    • pp.177-184
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    • 2019
  • The Defense Technology Security Act was enacted in 2015 to protect the defense industrial technology from being duplicated or interfering technologies being developed, which prevents its value and utility from deterioration and prevents inappropriate export. Defense industrial technology refers to technology that should be protected for national security among the national defense science and technology related to the defense industry. However, technical identification criteria of identification and management system of protection technology are not regulated. Therefore, in this study, through the Delphi survey, diesel engine core technology identification criteria related to the high efficiency internal combustion engine propulsion technology among the 141 defense industrial technologies is established to improve the identification and management system of the technology to be protected among the defense industrial technology protection system. As a result of the study, operational operability, durability, safety, sequencing and modularization were established as diesel engine core technology identification criteria.