Experimental Investigation of the Aerothermal Performance of a High Blockage Rib-Roughened Cooling Channel

Author:

Casarsa Luca1,Arts Tony2

Affiliation:

1. Dipartimento di Energetica e Macchine, University of Udine, via delle Scienze 208, 33100 Udine, Italy

2. Turbomachinery and Propulsion Department, von Kármán Institute for Fluid Dynamics, 72, chaussée de Waterloo, B1640 Rhode Saint Genèse, Belgium

Abstract

The present study deals with a detailed experimental investigation of the turbulent flow inside a rib-roughened turbine blade cooling channel. The measurements are carried out in a stationary straight channel with high blockage ribs installed on one wall. The main objective is to enhance the understanding and deepen the analysis of this complex flow field with the help of highly resolved particle image velocimetry measurements. A quasi-three-dimensional view of the flow field is achieved, allowing the identification of the main time-averaged coherent structures. The combined analysis of the present aerodynamic results with available heat transfer data emphasizes the role of the mean and fluctuating flow features in the heat transfer process. In particular, the stream wise/normal to the wall component of the Reynolds stress tensor is shown to be strictly related to the heat transfer rate on the channel surfaces. A correlation to estimate the heat transfer field from the aerodynamic data is presented for the high blockage rib roughened channel flow.

Publisher

ASME International

Subject

Mechanical Engineering

Reference31 articles.

1. Çakan, M. , 2000, “Aero-Thermal Investigation of Fixed Rib-Roughened Cooling Passages,” Ph.D. thesis, Université Catholique de Louvain, von Karman Institute for Fluid Dynamics.

2. Influence of Surface Heat Flux Ratio on Heat Transfer Augmentation in Square Channels With Parallel, Crossed and V-Shaped Angled Ribs;Han;ASME J. Turbomach.

3. Heat Transfer and Friction Characteristics in Rectangular Channels With Rib Turbulators;Han;ASME J. Heat Transfer

4. An Experimental Investigation of the Rib Surface Averaged Heat Transfer Coefficient in a Rib Roughened Square Passage;Taslim;ASME J. Turbomach.

5. Developing Heat Transfer in Rectangular Channels With Rib Turbulators;Han;Int. J. Heat Mass Transfer

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