为研究涡轮叶片缩扩蜿蜒通道的流动换热特性变化规律,采用瞬态液晶测温技术与数值仿真相结合的方法,分析入口雷诺数为Re=2~5×10₄^{及缩扩比分别为}s/k=2:5,3:5,4:5,5:5时缩扩蜿蜒通道与添加导流片通道的流阻及换热性能。结果表明：缩扩蜿蜒通道与添加导流片通道换热能力随着缩扩比的减小均呈现升高趋势。缩扩蜿蜒通道阻力系数普遍高于导流片通道,导流片通道随雷诺数增加阻力系数基本不变,变化幅度保持在1%~5%,当Re=2×10₄^,s/k=5:5时导流片通道阻力系数相比缩扩蜿蜒通道下降了59.46%。导流片通道综合热力性能强于缩扩蜿蜒通道,过高或过低缩扩比都会降低综合热力性能,最高的综合热力性能出现在Re=2×10₄^,s/k=3:5时的导流片通道TPF=0.87。综上所述,蜿蜒缩扩通道在未来涡轮叶片内冷通道设计方面具有一定参考价值。

In order to study the variation law of flow heat transfer characteristics of turbine blade constricted and expanded serpentine channel, The flow resistance and heat transfer performance of the inlet Reynolds number Re=2~5×104 ^{and the} contraction and expansion ratio of s/k=2:5, 3:5, 4:5 and 5:5 were analyzed by using the method of transient liquid crystal technique and numerical simulation. The results show that the heat transfer capacity of the constricted and expanded serpentine channel and the channel with deflector increases with the decrease of the contraction and expansion ratio. The resistance coefficient of the deflection meandering channel is generally higher than that of the deflector channel, and the resistance coefficient of the deflector channel is basically unchanged with the increase of Reynolds number, and the change range remains at 1%~5%, when Re=2×10⁴ and s/k=5:5, the resistance coefficient of the deflector channel decreases by 59.46% compared with the constricted and expanded serpentine channel. The thermal performance of the deflector channel is stronger than that of the constricted and expanded serpentine channel, and the thermal performance of the deflector channel is higher or too low than the contraction and expansion ratio, the highest thermal performance occurs at Re=2×10⁴, s/k=3:5 The deflector channel TPF=0.87. In summary, the constricted and expanded serpentine channel, has reference value in the design of the inner cooling channel of turbine blades in the future.

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国家自然科学基金项目（面上项目，重点项目，重大项目）