| PREDICTING UNBURNED HYDROCARBONS IN THE THERMAL BOUNDARY LAYER CLOSE TO THE COMBUSTION-CHAMBER WALL IN A GASOLINE ENGINE USING A 1-D MODEL
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| Kei Yoshimura1,5, Hajime Yahata1, Shoya Tanamachi2, Kyohei Yamaguchi3, Ratnak Sok4, Jin Kusaka1, Satoshi Tokuhara5 |
1Waseda University
2Waseda University
3Waseda University
4Waseda University
5SUZUKI MOTOR CORPORATION |
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| ABSTRACT |
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The purpose of this study was to develop a one-dimensional (1-D) model for predicting the amount of unburned hydrocarbons (UHC) due to flame extinction by quenching close to the combustion chamber wall in a gasoline engine. The local Reynolds number was used to predict the thickness of the thermal boundary layer developed by in-cylinder flow caused by high speed charge passing through the intake valves. The effect of different intake port geometries, including moderate- and high-tumble types, on the thickness of the thermal boundary layer was examined. The flame extinction model was integrated into a 1-D gasoline engine model. The amount of UHC predicted by the model was compared with experimental results by using a single-cylinder gasoline engine under various engine operating conditions. The numerical values were found to be in reasonable agreement with the measured data. A methodology for controlling UHC was also proposed in the final section. |
| Key Words:
Gasoline engine, Combustion, Numerical simulation, Prediction model, Emissions |
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Corresponding Author.
Kei Yoshimura , Email. 
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