Study On Performance Of Heat Exchange And Optimized Design Of Structure For Exhaust Cooler Of Stirling Engine

In order to ensure the normal work of the Stirling engine system, exhaust cooler should be equipped to reduce high temperature of exhaust gas to normal degree. It is considered that the structure of the cooler greatly affects flow state and performance of heat transfer. Based on classical theory and numerical simulation method, the heat transfer performance of the exhaust cooler as well as its structure optimization was studied. The heat transfer model of the exhaust cooler was put forward on the inner structure with helical coil mode. By means of CFD codes, Fluent, numerical simulations of flow flied and heat transfer on the tube and shell side in exhaust cooler under various operating conditions and structure parameters were carried out on the basis of reasonable simplification from complex real situation. Through analysis and comparison of simulation results, the rules of fluid flowing and heat transfer were concluded both on the tube and shell side. Furthermore, the data obtained from simulation was fitted by nonlinear function. Then, an experimental formula used in heat transfer calculation was deduced from fitting results and the optimized structure of the exhaust cooler was put forward. It is believed that the results described in the dissertation should be helpful to future improvement of exhaust cooler design.