| Summary: | 碩士 === 朝陽科技大學 === 數位化產品設計產業研發碩士專班 === 99 === Radiator is one of the most critical parts in the automotive cooling system. The performance of the radiator can significantly influence the performance, efficiency and reliability of an engine. As the evolution of modern engine, the cooling ability of radiator system has become more and more demanding. No matter in original design of new autos or in after market, radiator cooling performance has become more important. Producing higher efficiency, compact and cost-competitive radiators has become the major solutions to the requirements in various operations condition and industries from all over the world. It is inevitable in the future that efficiency is a major consideration since environmental issues. Also, manufacturability and cost-effective that are closely related to competitiveness of an enterprise should be also consider in developing the radiator.
At the same time, with the development of IT (Information technology), various CFD techniques have been applied in the research related with auto engine radiator cooling. Applying CFD in investigating the whole engine cooling system and combining experimental testing data validation has become an important analysis method in engine cooling development process.
In this study, commercial software ANSYS CFX is used to perform numerical simulation and compared with experiment to verify the numerical results. The results validates the position of the in-out water pipes in a cooling radiator will influence the homogeneity of water flux, pressure drop and heat transfer ability of cooling water. In the numerical simulation, each water flow rate of the water channels is calculated independently. The coefficient of variation of water flow rate has been applied to evaluate the homogeneity of water flow between different position of inlet and outlet of water channels.
From the results of the numerical simulation and experiment data, one can conclude that the radiator can be improved by relocating the positions of inlet, outlet channels. The heat transfer rate improves 3.7 percent than that of the original design given the condition of the same pressure drop 60Kpa. Pressure drop decreases 10 percent than that of the original design given the condition of the uniformly water flow rate 27.2L/Min. My research actually improve the efficiency of the cooling radiator unchanging the cooling radiator size and non-additional or non-reductive complementary equipment.
CFD has significant merits as a means of simulating experiments. It can manifest water flow details inside a cooling radiator. CFD proves itself valuably to be taken into consideration about improvement of the cooling radiator.
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