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

Yao, Yufeng; Effendy, Marwan; Yao, Jun

Abstract

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.

Citation

Yao, Y., Effendy, M., & Yao, J. (2013). Evaluation of wall heat transfer in blade trailing-edge cooling passage. Applied Mechanics and Materials, 284-287, 738-742. https://doi.org/10.4028/www.scientific.net/AMM.284-287.738

• Journal Article Type: Conference Paper
• Publication Date: Feb 20, 2013
• Journal: Applied Mechanics and Materials
• Print ISSN: 1660-9336
• Electronic ISSN: 1662-7482
• Publisher: Trans Tech Publications
• Peer Reviewed: Not Peer Reviewed
• Volume: 284-287
• Pages: 738-742
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.738
• Keywords: CFD modelling, heat transfer evaluation, turbine blade cooling effectiveness
• Public URL: https://uwe-repository.worktribe.com/output/935900
• Publisher URL: http://dx.doi.org/10.4028/www.scientific.net/AMM.284-287.738