导流片结构参数对缩扩蜿蜒通道流阻及换热性能影响.

In order to improve the flow and heat transfer performance of cold channels in turbine blades, the effects of the structure, arrangement form and geometric dimensioning of the deflector on the flow resistance and heat transfer performance in the constricted and expanded serpentine channel at the inlet Reynolds number of 2 × 10 4 ~ 8 × 10 4 were investigated by numerical simulation, and the relationship between secondary flow intensity and thermal performance factor was obtained. The results show that with the increase of Reynolds number, the change range of drag coefficient of the channel with deflector is less than 5%. The 180° deflector has the strongest drag reduction ability among all models, and the drag coefficient of the channel with deflector decreases by 50. 2% compared with that without deflector. The deflector structure plays an enhanced role in heat transfer, the 180° deflector has the most significant enhanced heat transfer effect, increasing the heat transfer coefficient by 12. 3%. Different structures of the deflector have a great influence on the thermal performance factor of the channel, and the thermal performance factor of the 180° deflector channel is the strongest, which is 56. 4% higher than that of the channel without deflector. In summary, the study of the structural parameters of the deflector can effectively reduce the flow resistance loss of the cold channel and enhance its heat transfer capacity. [ABSTRACT FROM AUTHOR]