Evaluation of wall heat transfer in blade trailing-edge cooling passage

Yao, Yu Feng, Effendy, Marwan and Yao, Jun (2013) Evaluation of wall heat transfer in blade trailing-edge cooling passage. Applied Mechanics and Materials, 284-28 . pp. 738-742. ISSN 1660-9336

Full content URL: http://dx.doi.org/10.4028/www.scientific.net/AMM.2...

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Model configurations of a blade trailing-edge internal cooling passage with staggered elliptic pin-fins in streamwise and spanwise are adopted for numerical investigation using computational fluid dynamics (CFD). Grid refinement study is performed at first to identify a baseline mesh, followed by validation study of passage total pressure loss, which gives 2 and 4 discrepancies respectively for two chosen configurations in comparison with experimental measurements. Further investigations are focused on evaluation of wall heat transfer coefficient (HTC) of both pin-fin and end walls, and it is found that CFD predicted pin-fin wall HTC are generally in good agreement with test data for the streamwise staggered elliptic pin-fins, but not the spanwise staggered elliptic pin-fins in which some discrepancies occur. CFD predicted end wall HTC have shown reasonable good agreement for the first three rows, but discrepancies seen in downstream rows are around a factor of 2-3. A ratio of averaged pin-fin and end walls HTC is estimated 1.3-1.5, close to that from a circular pin-fin configuration that has 1.8-2.1. Further study should focus on improving end wall HTC predictions, probably through a conjugate heat transfer model. © (2013) Trans Tech Publications, Switzerland.

Additional Information:2nd International Conference on Engineering and Technology Innovation 2012, ICETI 2012; Kaohsiung; Taiwan; 2 November 2012 through 6 November 2012; Code 95485
Keywords:CFD modelling, Conjugate heat transfer, Cooling passages, End-wall, Experimental measurements, Grid refinement, Internal cooling passages, Model configuration, Numerical investigations, Pin-fins, Test data, Total-pressure loss, Turbine blade cooling, Validation study, Wall heat transfer, Wall heat transfer coefficients, Fins (heat exchange), Heat transfer, Innovation, Computational fluid dynamics
Subjects:H Engineering > H100 General Engineering
Divisions:College of Science > School of Engineering
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ID Code:11516
Deposited On:18 Sep 2013 15:32

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