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Experimental and Numerical Analysis of Gas Turbine Blades With Different Internal Cooling Geometries

机译:不同内部冷却几何形状的燃气轮机叶片的实验和数值分析

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摘要

This paper presents the effects of major geometrical modifications to the interior of a convection cooled gas turbine rotor blade. The analysis of the flow is performed experimentally with flow visualization via paint injection into water, whereas the flow and the heat transfer are investigated numerically with ansys CFX, utilizing the SST turbulence model. Two sets of calculations are carried out: one under the same conditions as the experiments and another according to realistic hot gas conditions with conjugate heat transfer. The aim is to identify flow phenomena altering the heat transfer in the blade and to manipulate them in order to reduce the thermal load of the material. The operating point of the geometric base configuration is set to Re =50,000 at the inlet while for the modified geometries, the pressure ratio is held constant compared with the base. Flow-structures and heat transfer conditions are evaluated and are linked to specific geometric features. Among several investigated configurations one could be identified that leads to a cooling effectiveness 15% larger compared with the base.
机译:本文介绍了对流冷却燃气轮机转子叶片内部主要几何形状的变化。流动的分析是通过注入水到水中的流动可视化来进行的,而实验则是通过流动可视化进行的,而流动和传热则是使用SST湍流模型通过ansys CFX进行数值研究的。进行了两组计算:一组在与实验相同的条件下进行,另一组根据具有共轭传热的实际热气条件进行。目的是识别改变叶片中热传递的流动现象并对其进行处理,以减少材料的热负荷。几何基础构造的工作点在入口处设置为Re = 50,000,而对于修改后的几何形状,压力比与基础相比保持恒定。评估流动结构和传热条件,并将其与特定的几何特征联系起来。在几种已研究的配置中,可以确定一种导致冷却效率比基座高15%的配置。

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