• 제목/요약/키워드: Subchamber

검색결과 5건 처리시간 0.021초

정적연소기 부실내 잔류공기 소기특성에 대한 수치해석적 연구 (Numerical Study on Scavenge Characteristics in a Subchamber of Constant Volume Combustor)

  • 허형석;서용권
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.1830-1834
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    • 2004
  • In this paper, we present scavenge characteristics in a small subchamber of HCCI. It is very important to enhance scavenge rate because ignition in a chamber sometimes does not happen. To understand this phenomenon numerical tool was performed using the FLUENT which is a commercial code. Focus is given to the effect on the scavenge rate of the geometric factor that is the angle of nozzle injection. The numerical results show that the scavenge ones in the subchamber heavily depend on the nozzle angle. It was found that the scavenge rate is more effective at angled nozzle.

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HCCI 엔진 부실내 소기특성에 대한 이론 및 수치해석적 연구 (THEORETICAL AND NUMERICAL STUDY ON SCAVENGE CHARACTERISTICS IN A SUBCHAMBER OP AN HCCI ENGINE)

  • 서용권;허형석
    • 한국전산유체공학회지
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    • 제10권2호
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    • pp.21-29
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    • 2005
  • In this paper, we present the theoretical and numerical results of scavenge characteristics in a small subchamber of an HCCI(Homogeneous Charge Compression Ignition) engine. Two theoretical models are proposed in prediction of the scavenge time and the efficiency; one is the non-mixing model in which the input gas(CH4) and the existing gas(air) do not mix at all, and the other is the fully-mixed model in which the two gases are assumed to mix completely before ejection. Focus is also given to the effect on the scavenge performance of the size of the chamber outlet.

희박연소를 위한 혼합기의 성층급기와 유동에 관한 연구 (A Study on the Effects of Induced Mixture Flows and the Stratified Charge for a Lean Burn)

  • 전대수;이태원;윤수한;하종률
    • 한국자동차공학회논문집
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    • 제8권1호
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    • pp.1-9
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    • 2000
  • In the present study, the IDI-type constant volume chamber, which utilizes the indirect injection stratified charge method, is used to solve several problems including misfires and cycle-variations caused by unstable initial ignitions. A subchamber has been used to make an ignitable mixture under the low mean equivalence ratio. After burned in the subchamber, the flame jet getting through the passage hode enters the main chamber and burns the lean charge. There are many factors which affect the combustion characteristics of the indirect injection stratified engine. The passage hole angle is the most important since it determines the direction of flame flows into the main chamber. In the present study, we measured the combustion pressure, and the wall temperature, and computed the heat flux through the cylinder wall in order to understand the combustion characteristics depending on passage hole angle and the equivalence ratio.

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라디칼인젝터를 적용한 정적연소기의 연소특성에 관한 계산적 연구 (Numerical Study on Combustion Charaterestics in a Constant Volume Combustor Having a Radical Injector)

  • 조상무;전재혁;장인선;정성식;박권하
    • 대한기계학회논문집B
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    • 제27권9호
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    • pp.1309-1316
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    • 2003
  • A premixed-compression-ignition engine has been studied to improve the efficiency and to decrease exhaust emissions. However those systems have some difficulties for controlling combustion process. Radical is an activated chemical species formed by a chemical chain reaction between reactant and product. When the chain reactions occur, the energy bond of species is broken easily by the released radicals. The combustion chamber of the premixed-compression-ingnition engine is consist of a main chamber with lean premixture and a subchamber with rich premixture. Those are connected by narrow cylinderical connections. With ignition start in the subchamber, many different kinds of radical is jetted into the main chamber. The premixed gas in main chamber is quickly burned up by the radical ignition in multi-pionts. In this paper, the combustion phenomena in a constant volume combustor having a radical injector are numerically analyzed. The some constants in the reaction rate equation are adjusted by the experimental results tested in the same geometrical chamber. The code is applied on the two combustors in a wide range of equivalence ratio. The results show that the burning time is much shorter in the combustor having radical injector.

부실식 정적연소실내 연소특성에 관한 연구 (II) 임계연락공의 형상변화에 따른 연소촉진효과 (Combustion Characteristics in a Constant Volume Combustion Chamber with Sub-Chamber (II) Effect of Combustion Promotion with Configuration Change of the Critical Passagehole)

  • 김봉석;권철홍;류정인
    • 대한기계학회논문집
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    • 제17권10호
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    • pp.2611-2623
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    • 1993
  • To construct the design back data for a lean-burn gas engine, we investigated the combustion characteristics in the main chamber using a constant volume combustion chamber with subchamber. The combustion characteristics with configuration change of the critical passageholes have been studied by taking pressure data, schlieren photograph, ion current and light emission signal of flame. Heat release rate with various critical passageholes also have been analysed by using the combustion model of a prechamber diesel engine. It was found that combustion characteristics in the main combustion chamber were greatly influenced by the geometric configurations of critical passagehole.