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Measurement and analysis of turbulence response near the stagnation region of large diameter cylindrical leading edges with aftbody

Md. Nafiz H. K. Chowdhury-2012-01-01-UND Scholarly Commons (University of North Dakota)
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TL;DRAbstract

The stagnation region of a turbine vane is a critical area for assessing heat transfer. The heat loads at that region are influenced by many factors such as the turbulence intensity, length scales, interaction of the turbulent eddies, vortex stretching and rapid straining of the fluid streamlines. In such a situation, it becomes difficult for gas turbine designers to accurately predict the heat transfer rate at leading edge stagnation region. The purpose of this study is to investigate the response of high intensity free stream turbulence (FST) near the stagnation region of two different diameter leading edge cylinders in order to better understand the physics and to expand the parameter range for vane designers. Since FST has significant impact on the heat transfer augmentation, this study will examine the influence of elevated turbulence in the highly accelerating flow near the stagnation region. In the presence of the stagnation region of a body, turbulence can be intensified due to

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The stagnation region of a turbine vane is a critical area for assessing heat transfer. The heat loads at that region are influenced by many factors such as the turbulence intensity, length scales, interaction of the turbulent eddies, vortex stretching and rapid straining of the fluid streamlines. In such a situation, it becomes difficult for gas turbine designers to accurately predict the heat transfer rate at leading edge stagnation region. The purpose of this study is to investigate the response of high intensity free stream turbulence (FST) near the stagnation region of two different diameter leading edge cylinders in order to better understand the physics and to expand the parameter range for vane designers. Since FST has significant impact on the heat transfer augmentation, this study will examine the influence of elevated turbulence in the highly accelerating flow near the stagnation region. In the presence of the stagnation region of a body, turbulence can be intensified due to

Keywords

TurbulenceMechanicsStagnation pointStagnation pressurePhysicsMeteorologyMaterials scienceHeat transfer

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