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Shape design of internal cooling passages within a turbine blade

机译：涡轮叶片内部冷却通道的形状设计

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The article concerns the optimization of the shape and location of non-circular passages cooling the blade of a gas turbine. To model the shape, four Bezier curves which form a closed profile of the passage were used. In order to match the shape of the passage to the blade profile, a technique was put forward to copy and scale the profile fragments into the component, and build the outline of the passage on the basis of them. For so-defined cooling passages, optimization calculations were carried out with a view to finding their optimal shape and location in terms of the assumed objectives. The task was solved as a multi-objective problem with the use of the Pareto method, for a cooling system composed of four and five passages. The tool employed for the optimization was the evolutionary algorithm. The article presents the impact of the population on the task convergence, and discusses the impact of different optimization objectives on the Pareto optimal solutions obtained. Due to the problem of different impacts of individual objectives on the position of the solution front which was noticed during the calculations, a two-step optimization procedure was introduced. Also, comparative optimization calculations for the scalar objective function were carried out and set up against the non-dominated solutions obtained in the Pareto approach. The optimization process resulted in a configuration of the cooling system that allows a significant reduction in the temperature of the blade and its thermal stress.
机译：该文章涉及冷却燃气轮机叶片的非圆形通道的形状和位置的优化。为了对形状建模，使用了四个Bezier曲线，这些曲线形成了通道的封闭轮廓。为了使通道的形状与叶片轮廓匹配，提出了一种技术来将轮廓碎片复制并缩放到组件中，并在它们的基础上构建通道的轮廓。对于如此定义的冷却通道，进行了优化计算，以根据假定的目标找到其最佳形状和位置。使用帕累托（Pareto）方法，将任务作为多目标问题解决了，该任务用于由四个和五个通道组成的冷却系统。用于优化的工具是进化算法。本文介绍了总体对任务收敛的影响，并讨论了不同优化目标对获得的Pareto最优解的影响。由于在计算过程中注意到各个目标对解决方案前沿位置的不同影响，因此引入了两步优化程序。此外，针对标量目标函数进行了比较优化计算，并针对在Pareto方法中获得的非支配解进行了设置。优化过程导致了冷却系统的配置，该配置可显着降低叶片温度及其热应力。

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  • 来源
    《Engineering Optimization》 |2012年第4期|p.449-466|共18页
  • 作者

    Grzegorz Nowak;

  • 作者单位

    Institute of Power Engineering and Turbomachinery, Silesian University of Technology, ul. Konarskiego 18, 44-100, Gliwice, Poland;

    Institute of Mathematics, Silesian University of Technology, ul. Kaszubska 23, Gliwice, Poland;

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