Enhancement of Stratified Charge for DISI Engines through Split Injection : Effect and Its Mechanism(<Special Issue>Advanced Combustion Technology in Internal Combustion Engines)
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概要
- 論文の詳細を見る
The effect of split injection on the mixture characteristics of DISI (Direct Injection Spark Ignition) engines was investigated firstly by the Laser Absorption Scattering (LAS) technique. Through splitting the fuel injection process, two possible benefits were found: 1) High density liquid droplets piling up at the leading edge of the spray can be circumvented, subsequently the reduction of the spray tip penetration; 2) The quantity of "over lean" (φ_v<0.7, φ_v: equivalence ratio of vapor) mixture in the spray can be significantly reduced. These are believed to contribute to the reduction of the engine-out smoke and HC emissions. In order to clarify the mechanism behind the effect of the split injection, the spray-induced ambient air motion was investigated by the LIF-PIV technique. The strong ambient air entrainment into the tail region of the spray and a counter-vortex structure were found in both the single and split injections. In the case of the single injection, the spray develops in extending its length, subsequently a larger volume results and thus it is diluted to "over lean" by the ambient air entrainment. In contrast, in the case of split injection, the second spray is injected into the tail region of the first spray and its evaporation is promoted by the ambient air motion induced by the first spray. Hence the replenishment of the liquid fuel into the leading edge of the first spray is reduced. As a consequence, the high density liquid droplets piling up at the leading edge is avoided. Furthermore, a more compact spray results so that the ambient air motion plays a positive role on evaporating the spray into "more combustible" (0.7<φ_v< 1.3). This is especially true in the tail region of the spray and the region where the counter-vortex motion is occurring.
- 一般社団法人日本機械学会の論文
- 2005-11-15
著者
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Li Tie
Department Of Mechanical Science Hokkaido University
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NISHIDA Keiya
Department of Mechanical System Engineering, University of Hiroshima
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ZHANG Yuyin
Department of Mechanical System Engineering, University of Hiroshima
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ONOE Tuyoshi
Department of Mechanical System Engineering, University of Hiroshima
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HIROYAU Hiroyuki
Hiro Technology Brains, Inc.
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Zhang Yuyin
Department Of Mechanical System Engineering University Of Hiroshima
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Zhang Yuyin
Department Of Mechanical System Engineering Hiroshima University
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Nishida Keiya
Department Of Mechanical System Engineering University Of Hiroshima
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Nishida Keiya
Department Of Mechanical Engineering Hiroshima University
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Onoe Tuyoshi
Department Of Mechanical System Engineering University Of Hiroshima
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Hiroyasu Hiroyuki
Hiro Technology Brains Inc.
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Nishida Keiya
Department Of Mechanical Systems Engineering University Of Hiroshima
関連論文
- Droplet size distribution and evaporation characteristics of fuel spray by a swirl type atomizer
- Enhancement of Stratified Charge for DISI Engines through Split Injection : Effect and Its Mechanism(Advanced Combustion Technology in Internal Combustion Engines)
- Enhancement of Stratified Charge for DISI Engines through Split Injection : Effect and Its Mechanism(S.I. Engines, Stratified-Charge Combustion)
- Effects of Injection Splitting on Mixture Properties of Fuel Spray Injected by High Pressure Swirl Injector for DISI Engines
- Spray and Vaporization Characteristics of Group-Hole Nozzle
- Fuel Injection Strategies to Enhance Evaporation in D.I. Diesel Sprays : Effect of Injection Pressure, Nozzle Hole Diameter and Split Injection
- Effect of Injection Pressure and Nozzle Hole Diameter on Mixture Properties of D.I. Diesel Spray
- Characterization of Liquid Jet Atomization across a High-Speed Airstream
- Evaporating spray and flame distributions in the combustion chamber of a direct injection diesel engine
- (1-22) Characterization of Droplets and Vapor Concentration Distributions in Split-Injection Diesel Sprays by Processing UV and Visible Images((FS-2)Fuel Sprays 2-Diesel sprays)
- Quantitative lmaging of Evaporating Diesel Sprays by Ultraviolet and Visible Lasers
- Flow Field in Swirl-Type Tubular Flame Burner
- Measurements of Fuel Vapor Concentration in a Diesel Spray by Image Analysis of a Reconstructed Hologram
- SC1-4: Spray Evaporation and Combustion Characteristics of Group-Hole Nozzle for D.I. Diesel Engines(SC: Spray and Spray Combustion,General Session Papers)
- Correlation of Mixture Formation and Combustion Processes in D. I. Diesel Sprays