| Turbine is a main component of a gas turbine engine, by which part of the thermal energy in the high-temperature and high-pressure gas from the combustion chamber, can be converted to the mechanical kinetic energy. A marine gas turbine is characterized with high power, high temperature, high rotating speed and high efficiency ,as well as size and weight restricted by strict rules. Using cooling technology on the core component of gas turbine, can reduce the working temperature of blade, increase the working efficiency of turbine and extend working life of blade.For these years, scholars in aerodynamics field have attached great importance on numerical simulation and performance optimization for high temperature cooling blade turbine.Based on the original model of the first-stage in a style marine high-pressure gas turbine, simplified the model and designed a physical model according to the drawing, which is suitable for numerical simulation. And then established calculation model.Using CFD business software to numerical simulate the turbine flow field with different cooling air flow.Compared the result to known date and adjusted calculation setting in order to get the best result and realize the research purpose.Explore the optimal turbulence model which can simulate a well cooling air jet flow field and numerical simulate flow fields of different cooling air flow. Conclusion: Cooling air comes out from double trailing edge blade, and mixs with two tails nearby blade trailing edge. Over a short distance, the mixing of high-temperature gas with low energy trail is the main factor until they mix fully; Cooling air decreases the loss of total pressure in tail flow field; Cooling air has a huge influence to the export air flow angle; Original design of cooling air injection has a well effect to blade tail and proved the rationality of the design. |
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