Study Of Heat Transfer And Flow In Blade Cooling Channels With Convection Cooling Structure

Improve gas turbine inlet temperature is the key to improve the efficiency of gas turbine.With the constant improvement of turbine inlet gas temperature,it is much more urgent to find new cooling technology.The paper mainly through experimental and numerical simulation study thermal performance and flow resistance of three different structure.The experiment mainly include steady experiment and transient experiment.Comparative and analysis of their respective Nusselt number and friction factor,in order to find out the better performance of convective heat transfer structure,and clarify heat transfer enhancement mechanism.The main convective cooling structure mainly includes: rib?dimple and protrusion?pin fin and detached pin fin.The experimental Reynolds number range from 8,500 to 60,000.The results show that the W rib has the best thermal performance;45 angle rib and dimple has the lowest Nu,but their pressure loss is also smallest,and overall thermal performance is relatively higher;90 angle rib has a good performance under low Reynolds number,but with the increase of Reynolds number,its heat transfer performance is falling and pressure loss is increasing;pin fin and detached pin fin has a strong heat transfer performance,but at the same time the pressure loss is very big,overall thermal performance is the lowest;V-rib's overall thermal performance is slightly better than 45 angle rib and dimple;dimple-protrusion structure has two heat transfer surface,can bring more heat transfer with the loss of pressure for the price.