| Author: | Leung, Tsz-chiu |
| Title: | Modelling soot formation and oxidation in direct injection diesel engine |
| Degree: | M.Sc. |
| Year: | 1998 |
| Subject: | Soot Diesel motor -- Combustion Diesel motor exhaust gas Hong Kong Polytechnic University -- Dissertations |
| Department: | Multi-disciplinary Studies Department of Mechanical Engineering |
| Pages: | xi, 79 leaves : ill. ; 30 cm |
| Language: | English |
| Abstract: | The objective of this project is to simulate and predict the in-cylinder and exhaust soot levels, and to investigate the soot particles size variation effect into the soot models. In Hong Kong, the exhaust from diesel engine driven motor vehicles is the major source of air pollution. This is often caused by the past poor urban planning of industrial and residential buildings. Although many ordinances and legislations are set up to control the soot emission from the vehicles, the better solution is to install the vehicles with the soot reduction technology devices such as catalytic converters. Therefore, there is a need to set up the soot models to simulate and predict the in-cylinder and exhaust soot levels accurately under different operation conditions of the diesel engine. In this project, many soot models proposed by previous investigators are reviewed. Among all of them, only phenomenological models are in good agreement with the facts confirmed through the experiments and these models have mutually been well-verified by the researchers. Therefore, two phenomenological models : Thomas Morel model and Nagle and Strickland-Constable oxidation model are chosen to simulate and predict the in-cylinder and exhaust soot levels. One of the objectives of the project is to merge these two models together by adjusting the partial pressure of oxygen with the Break Mean Effective Pressure effect. Both soot models are also extended to incorporate the submodels so as to give a more accurate results. Reasonable predictions are obtained when comparing with the published literature data in terms of general trend and quantitative behaviour. The other objective is to investigate the soot particles size variation effect into the soot models. Therefore, three different approaches, i.e. the sensitivity of the soot particles size, the soot particles size under log-normal distribution and the soot particles variation found by D.R. Tree are used for evaluation of the soot particles size variation effect in both the Morel model and the modified Morel model. Among these three approaches, the soot particles variation found by D.R. Tree is found to be more suitable for predicting the peak and exhaust soot levels rather than the others in this study. Moreover, some recommendations such as set up of the soot particles submodels are also suggested for future work. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b14605144.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.66 MB | Adobe PDF | View/Open |
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