Influence of tapered bridge holes on impingement double wall cooling for gas turbine blade
In order to investigate the influence of the bridge holes on flow and thermal behavior of impingement double-wall cooling for gas turbine leading blades,the impingement double-wall cooling configurations with 0°,5°,10°,15° and 20° tapered bridge holes were calculated by using ANSYS CFX numerical simulation.Results indicated that the tapered bridge holes can significantly enhance the comprehensive heat transfer capacity.As the angle of bridge holes increased from 0° to 20°,the angle of holes did not have a significant influence on flow loss of inner and outer chambers for the blades.Likewise,the cooling performance of the inner chamber target wall was not sensitive to the change of the bridge hole angle.With the growing angle of bridge holes,the thermal behavior of the target wall for the outer chamber increased at first and then decreased,reaching the biggest value at 15°.When the angle of bridge holes increased to 15°,its average heat transfer intensity was 19.7％higher than the case with 0° bridge holes.Similarly,the thermal performance factor of the whole configuration also became larger at first and then became smaller.The largest thermal performance factor occurred at 15° too,which was 12.15％higher than the case with 0° bridge holes.
double wallimpingement coolingtapered bridge holesflow propertiesheat transfer characteristicsthermal performance factor
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