Split of heat transfer regions and flow characteristics of perforated blockages with inclined holes for trailing edge cooling

Abstract

Perforated blockages with inclined impingement holes are one of the cooling methods that can be used in the trailing edge of gas turbine. This method has a high heat transfer enhancement as well as high frictional resistance. Numerical investigation has been conducted to make a deep insight into the flow fields and pressure distribution of this cooling structure. Split of high heat transfer region has been detected in the impingement region, which may enlarge the thermal stress of metal bulk. The pressure gradient and counter rotating vortex is found to be the mainspring of this phenomenon. Large total pressure dissipation is founded within the impingement chambers.

Additional information

Funding

Project 51706116 supported by National Natural Science Foundation of China. The authors also get support from Science Fund for Creative Research Groups of the National Natural Science Foundation of China (No. 51621062).