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瞬态液晶测量技术能有效测量物体表面的换热系数,目前已经在传热研究中得到了广泛的应用。本文重点介绍了该测量方法在高温涡轮叶片内部冷却传热研究中的实验过程及应用。对内部冷却U型通道的传热研究表明:气膜抽吸作用下,通道内孔附近的传热得到强化,但区域平均传热系数变化不大;同时抽吸能使带肋通道中的压力损失有所降低。为了满足叶片冷却设计中对传热和压力损失的不同要求,改变弯头区的结构形式是一种有效的手段。实验结果进一步表明,瞬态液晶测量方法能准确地测量内部冷却通道中的传热分布,能为测量和优化涡轮叶片内部冷却传热特性提供可靠的数据支持。
Transient liquid crystal measurement technology can effectively measure the heat transfer coefficient of the object surface, and has been widely used in heat transfer research. This paper focuses on the experimental process and application of this measurement method in the study of internal cooling heat transfer in high-temperature turbine blades. The results of heat transfer study on the internally cooled U-shaped channel show that under the action of gas film suction, the heat transfer near the inner hole of the channel is strengthened, but the average heat transfer coefficient of the area has little change; while the suction can make the pressure in the ribbed channel Loss is reduced. In order to meet the different requirements of heat transfer and pressure loss in the blade cooling design, it is an effective way to change the structure of the elbow zone. The experimental results further show that the transient liquid crystal measurement method can accurately measure the heat transfer distribution in the internal cooling channels and provide reliable data support for measuring and optimizing the cooling and heat transfer characteristics inside the turbine blades.