| Energy conservation and environmental protection are the development direction of new energy technology, while the ultra-supercritical steam turbine is one of the typical representatives. The cooling protection to cool the hot components is the key techniques for ultra supercritical steam turbine, it will influence the safety and the life of the steam turbine. As one of the cooling methods, vortex cooling is simple and efficient, which desires further study. What'more, the extraction technology is chose to improve the thermal efficiency and reduce erosion, that is very meaningful.In this thesis, the flow fields of tangential direction cooling and extraction technology are researched. In this process, 4 different models of inlet hole are built and the flow fields are compared. Besides, the max temperature difference and the flow which is to lower the temperature are compared to find the best cooling efficiency. On the basis of finding the best inlet shape, the cooling effects of different inlet angles are researched. It finds that the max temperature difference of 90°inlet is the best, but the cooling is not uniform. What's more, the cooling efficiency of 45°inlet is the best, and the cooling is uniform, so it's worth applying in the further.To improve the thermal efficiency, the thesis analyzes the flow field of IP cylinder. The flow data of typical plane, flow and pressure loss of different holes are compared, and the zone which has the maximum total pressure loss is found. Besides, the CFD result is compared with the engineering result, finding that they are mostly the same, so it can be used to supply the references for engineering application.
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