| The affection of the coolant flow in engines cooling system focus on the cooling effective, heat load of the parts, the distribution and usage of heat energy.Meanwhile, the emissions of the engine are closely related to the coolant temperature.With the approaches to increase out part power used, perfectly improving cooling system have become the important tasks to design original engines. Because of the complexity of the water jacket, the measurement study was difficult to observe the practical flow conditions in jacket and limit to comparing and analyzing the temperature and flux.For this reason, the numerical simulations on the flow and heat transfer in engine water jacket becomes a principal method to optimum cooling system.From the existing publishes on the simulations of coolant flow, it was discovered that these achievements are not effectively to solve the engineering problems. In this dissertation, it was analyzed the latest development and application of turbulent models. The turbulent model k-s was found to be the most novel and accurate for simulating the coolant flow in engine water jacket.The 3-D geometry of the engine block water jacket for type 4102 diesel engine, including the oil intercooler, was built by Pro/Engineer. In order to account for the affection of outlet location on coolant flow, the simplified cylinder heat water jacket was also attached to the geometry above. The current computational mesh generating techniques were clearly reviewed. High quality mesh was constructed with fine near-wall mesh and local refinements by GAMBIT software, Heat transfer boundaries and several other critical parameters were discussed and defined important numerical results, such as velocity distribution and heat transfer coefficient, were analyzed in detail. Flaws of the water jacket and the causes were presented.In this paper, the effective simulation results are obtained and important reference is put forward for flowing and heat translation of diesel engine water jacket. |
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