Study of the Impingement Hole with Different Geometric Characteristics on Cooling Performance
In order to improve the impingement cooling efficiency in the transitional section of the turbine combustor,by constructing a three-dimensional simplified transform piece model,the numerical simula-tion method was used to study the influence of different tapered impingement hole structures and features of impingement hole array on the flow and heat transfer characteristics of the target plate,especially the effect of jet Re number of different impinging orifice plate structures on Nu number of target plate.The re-sults show that the jet Reynolds number of the tapered hole increases with the increase of taper under the same cooling air inlet condition.The better heat transfer effect of target plate could be obtained when the taper of the conical hole is 1∶4.The average heat transfer of the target plate is increased by more than 15%.Moreover,among the three types of orifice plate structures with different impingement hole array arrangements,the target plate with the difference in hole size Δd=0.125d has the best heat transfer effect.Although the average number of heat transfer Nu is relatively small,the overall temperature distri-bution of the target plate is more uniform,which can effectively reduce the temperature gradient in the transition section of the combustion chamber.
simplified transform piece modelimpingement coolingstructure optimizationheat transfer enhancementnumerical simulation
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