(2-16) Two-Dimensional Mapping and Quantification of the In-Cylinder Air/Fuel-Ratio in a GDI Engine by Means of LIF((SI-5)S. I. Engine Combustion 5-In-Cylinder A/F and Temperatures)

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概要

• 論文の詳細を見る

• The optimization of the vaporization and mixture formation process is of great importance for the development of modern gasoline direct injection (GDI) engines, because it influences the subsequent processes of the ignition, combustion and pollutant formation significantly. In consequence, the subject of this work was the development of a measurement technique based on the laser induced fluorescence (LIF), which allows the two dimensional visualization and quantification of the in-cylinder air/fuel ratio. The investigations were carried out in a transparent engine provided by the BMW Group, Munich. A substitute fuel consisting of benzene and triethylamine dissolved in the non-fluorescent base fuel isooctane has been used. The main property is that the fluorescence signal is proportional to the equivalence ratio (φ=1/λ) at low absorption and negligible influences of the residual gas components CO_2 and H_2O at engine like conditions. The calibration of the LIF-signal was performed directly inside the engine, at a well known mixture composition, immediately before the direct injection measurements were started. Thus, it was possible to minimize crucial effects caused by window fouling, the non-uniformity of the laser illumination and finally the optical particularities of the setup. For comparison with the LIF results, Raman measurements were carried out simultaneously. The Raman scattering was selected as a reference measuring method, since the results of this technique are within the scope of our experiments nearly independent on ambient conditions as pressure and temperature, as well as on window fouling. In addition to different engine operating points in the homogeneous regime, the mixture formation was also investigated at stratified charge near the ignition point. A comparison between the results of both measurement techniques shows very good agreements of the air/fuel ratios.

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Leipertz Alfred

  Lehrstuhl Fur Technische Thermodynamik (ltt) University Of Erlangen-niirnberg : Esytec Energie- Und

• Leipertz Alfred

  Lehrstuhl Fur Technische Thermodynamik (ltt) University Of Erlangen-nurnberg

• Wagner Volker

  Lehrstuhl Fur Technische Thermodynamik (ltt) University Of Erlangen-nurnberg

• Ipp Wolfgang

  Lehrstuhl fur Technische Thermodynamik (LTT) University of Erlangen-Nurnberg

• Egermann Jan

  Lehrstuhl fur Technische Thermodynamik (LTT) University of Erlangen-Nurnberg

• Schmitz Ingo

  Lehrstuhl fur Technische Thermodynamik (LTT) University of Erlangen-Nurnberg

• Ipp Wolfgang

  Lehrstuhl Fur Technische Thermodynamik (ltt) University Of Erlangen-niirnberg

• Leipertz Alfred

  Lehrstuhl Fur Technische Thermodynamik (ltt) University Erlangen-nuremberg

関連論文

• (2-16) Two-Dimensional Mapping and Quantification of the In-Cylinder Air/Fuel-Ratio in a GDI Engine by Means of LIF((SI-5)S. I. Engine Combustion 5-In-Cylinder A/F and Temperatures)
• Investigation of In-Cylinder Soot Formation and Exhaust Soot Emission of a Direct Injection SI Engine by Laser-Induced Incandescence(LII)(Measurement PM in Flames)
• HC3-2: Influence of Different Fuels on Partially Premixed Combustion Inside a Common Rail DI-Diesel-Engine(HC: HCCI Combustion,General Session Papers)

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