Heat transfer characteristics of a dimpled/protrusioned pin fin wedge duct with different converging angles for turbine blades

Abstract

A numerical method is utilized to investigate the converging angle effects on the flow structure and heat transfer of a pin fin wedge duct with dimples/protrusions. The studied converging angles are $0.0°,$ $6.3°,$ and $12.7°.$ The results show that a pin fin-dimple wedge duct with larger converging angle produces higher heat transfer enhancement due to flow acceleration, increase of the impingement region, and shrinkage of the flow recirculation region, but it is also accompanied with a much larger friction factor. A pin fin-protrusion wedge duct with larger converging angle yields higher heat transfer augmentation due to flow acceleration and more intense impingement on the protrusion but it is also associated with larger pressure penalty.

Additional information

Funding

The authors acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51706051) and China postdoctoral science foundation funded project (No. 2017M620116).