Influence of Multi-hole Arrangement on Cooling Film Development |
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Authors: | YANG Chengfenga ZHANG Jingzhoub a AVIC |
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Institution: | The First Aircraft Institute, Xi’an 710089, China bCollege of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract: | A series of computations is conducted for many multi-hole arrangements at several blowing ratios to further investigate the evolution of the film from multi-holes. The influence of multi-hole arrangement on effusion film cooling is analyzed and a preliminary relationship evaluating the film development from developing state to developed state is brought forward. Results show that the coolant jets from front rows of multi-holes merge rapidly and the strength of the kidney vortices due to mainstream-coolant jet interaction in the downstream region are mitigated under super-long-diamond arrangement where the streamwise hole-to-hole pitch is bigger than spanwise hole-to-hole pitch. The holes array arranged in super-long-diamond mode is not only in favor of obtaining developed film layer, but also improving averaged adiabatic film cooling effectiveness. |
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Keywords: | effusion cooling multi-hole arrangement cooling effectiveness film development numerical simulation |
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