燃气透平带肋 Ｕ 型通道中纳米气溶胶对流传热特性及机理

A numerical Simulation study was oonducted to examine the convective heat transfer characteristics of nano-aerosols in ribbed U-channels of gas turbines. Compared with the heat transfer Situation in Channels under conventional air cooling conditions, the difference of heat transfer Performance of nano-aerosols was analyzed at nanoparticle volume fractions of 1 x 10",5x10" and 1 x 10". The mecha-nisms by which nanoparticles influenae convective heat transfer through several perspectives, such as flow field structure, aerosol thermophysical properties, wall boundary layer, and thermal boundary layer, were explored. The findings reveal that nano-aerosols significantly enhance heat transfer Performance compared to air, while no change in the fundamental flow behavior of the working fluid after adding the nanoparticles. From the aspect of aerosol thermal properties, enhancements in thermal conductivity and heat capacity due to nanoparticles primarily drive the improved heat transfer Performance. Additionally, nanop-articles positively affect the turbulent boundary layer and the thermal boundary layer's development, fur-ther boosting heat transfer effieiency. Although the introduetion of nanoparticles results in increased total pressure loss, the benefits gained from enhanced heat transfer outweigh the drag losses associated with their presence.