| Summary: | 碩士 === 國立成功大學 === 造船及船舶機械工程學系 === 88 === The fuel economy plays the most important requirement for a marine propulsion plant as it has the decisive influence on the operating cost of a ship. In general the improvements of the propulsive and engine efficiencies could reduce the fuel consumption. As an attempt to enhance the competitive advantages for the marine transportation business, the use of low quality and high viscosity diesel fuel and the high temperature as well as pressure thermodynamic cycle has been a global trend for the development of marine diesel engine.
The first stage of this research project applies the experimental method when the parametric analysis for the flow and energy equations was performed. The flow parameters, which controlled the heat transfer phenomena in the coolant channel of the piston, are identified; the experimental facilities and program will be established in accordance with the parametric conditions experienced by a real marine diesel engine. The experimental result for the flow within smooth-walled duct under the reciprocating motion will be used as the reference datum to assess the results for the study of heat transfer augmentation. As an attempt to enhance the cooling performance, the ribs will be installed in the coolant channels which flow was orthogonal mode for the piston moving direction. Finally, the results obtained for the tests with heat transfer augmentation devices will be compared with the smooth-walled test results. As long as the experimental tests are completed, the heat transfer correlation could be developed to assist the shipping industry during the design manufacturing stages for the marine diesel engine.
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