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초록· 키워드
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The computer program which predicts the gas exchange process of multi-cylinder 4-Stroke cycle spark-ignition engine, can be great assistance for the design and development of new engine. In this study, the computer program was developed to predict the gas exchange process of multi-cylinder four stroke cycle spark ignition engine including intake and exhaust systems. When gas exchange process is to be calculated, the evaluation of the variation of the thermodynamic properties with time and position in the intake and exchaust systems is required.
For the purpose, the application of the generalized method of characteristics to the gas exchange process is known as one of the method. The simulation model developed was investigated to the analysis of the branch system of multi-cylinder. The models used were the 2-zone expansion model and single zone model for in cylinder calculation and the generalized method of characteristic including area change, friction, heat transfer and entropy gradients for pipe flow calculation.
The empirical constants reduced to least number as possible were determined through the comparison with the experimented indicator diagram of one particular operating condition and these constants were applied to other operating condition. The predicted pressures in cylinder were compared with the experimental results over the wide range of equivalence ratio and ignition timing. The predicted values have shown good agreement with the experimental results. The theremodynamic properties in the intake and exhaust system were predicted over the wide range of equivalence ratio and ignition timing.
The obtained results can be sumarized as follows.
1. Pressures in the exhaust manifold have a little influence on the equivalence ratio, a great influence on the ignition timing.
2. Pressures in the inlet manifold are nearly unchanged by the equivalence ratio and the ignition timing.
3. In this study, the behaviors of the exhaust temperature, gas in the exhaust manifold were ascertained.
For the purpose, the application of the generalized method of characteristics to the gas exchange process is known as one of the method. The simulation model developed was investigated to the analysis of the branch system of multi-cylinder. The models used were the 2-zone expansion model and single zone model for in cylinder calculation and the generalized method of characteristic including area change, friction, heat transfer and entropy gradients for pipe flow calculation.
The empirical constants reduced to least number as possible were determined through the comparison with the experimented indicator diagram of one particular operating condition and these constants were applied to other operating condition. The predicted pressures in cylinder were compared with the experimental results over the wide range of equivalence ratio and ignition timing. The predicted values have shown good agreement with the experimental results. The theremodynamic properties in the intake and exhaust system were predicted over the wide range of equivalence ratio and ignition timing.
The obtained results can be sumarized as follows.
1. Pressures in the exhaust manifold have a little influence on the equivalence ratio, a great influence on the ignition timing.
2. Pressures in the inlet manifold are nearly unchanged by the equivalence ratio and the ignition timing.
3. In this study, the behaviors of the exhaust temperature, gas in the exhaust manifold were ascertained.
목차
ABSTRACT
1.緖論
2.理論 및 基本方程式
3.實驗裝置 및 實험方法
4.實驗 및 豫測結果 考察
5.結論
後記
參考文獻
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