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International Journal of Automotive Technology > Volume 23(1); 2022 > Article
International Journal of Automotive Technology 2022;23(1): 233-242.
doi: https://doi.org/10.1007/s12239-022-0020-3
PREDICTING UNBURNED HYDROCARBONS IN THE THERMAL BOUNDARY LAYER CLOSE TO THE COMBUSTION-CHAMBER WALL IN A GASOLINE ENGINE USING A 1-D MODEL
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
PDF Links Corresponding Author.  Kei Yoshimura , Email. yoshimurak@hhq.suzuki.co.jp
ABSTRACT
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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