基于fluent船用燃气轮机箱体冷却结构优化设计
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江苏科技大学

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Based on fluent marine gas turbine box cooling structure optimization design
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jiangsu university of science and technology

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    摘要:

    运用FLUENT软件对燃气轮机箱装体进行数值模拟,得到其箱装体内部的气流分布以及箱体壁面温度过高的缺陷,故在此基础上从两个方面对燃气轮机进行冷却结构优化,在箱装体内部设置分支结构来改善气流流向,在外部设置排气引射装置来冷却箱体并减少能耗,后通过对喷嘴进行后缘开缝处理增加其引射效率,以此解决箱装体内部温度过高的问题。结果表明分支结构可以很好的改善箱体内部流场分布,对于箱体冷却作用十分明显;当以排气引射器喷嘴处流动气流为动力源时,引射效率为31.9%时,对于箱体冷却起到一定作用,但还无法达到底板的冷却要求;当对喷嘴采用后缘开缝(6缝)时,其引射效率可达41.2%,满足底板的冷却要求。

    Abstract:

    Using FLUENT software to numerically simulate the gas turbine casing, the airflow distribution inside the casing and the defects of high wall temperature on the casing are obtained. Therefore, on this basis, the cooling structure of the gas turbine is optimized from two aspects. The branch structure is set up inside the box body to improve the airflow direction, and the exhaust ejector device is set up outside to cool the box body and reduce the energy consumption. After that, the ejection efficiency is increased by slotting the trailing edge of the nozzle to solve the problem of high temperature inside the box body. The results show that the branch structure can improve the internal flow field distribution of the box, and the cooling effect of the box is very obvious. When the flow air flow at the nozzle of the exhaust ejector is used as the power source, the ejection efficiency is 31.9 %, which plays a certain role in the cooling of the box, but it can not meet the cooling requirements of the bottom plate ; when the nozzle is slotted at the trailing edge ( 6 slots ), the ejection efficiency can reach 41.2 %, which meets the cooling requirements of the bottom plate.

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历史
  • 收稿日期:2023-06-27
  • 最后修改日期:2023-07-22
  • 录用日期:2023-07-24
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