This experiment used a parallel array of hot wire probes to simultaneously measure the temperature and velocity fields in the non-isothermal turbulent boundary layer of a rotating straight channel. The Reynolds numbers are 15,000 and 25,000, respectively. The rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28, respectively. The purpose of this study is to calculate the turbulent Prandtl number in a rotating non-isothermal turbulent boundary layer. Due to the difficulty in measuring local turbulent Prandtl numbers, this study focuses on the average turbulent Prandtl numbers in the logarithmic region instead. Under static conditions, this value is taken as 0.9 normally. This research finds that rotation conditions can affect the turbulent Prandtl number by affecting the properties of velocity and temperature boundary layers. The change range of the turbulent Prandtl number is roughly 0.6–1.1. The influence of the leading side is greater than that of the trailing side, especially at high rotation numbers. This can provide validation and guidance for numerical simulation. Other information within the turbulent boundary layer is also discussed. It is hoped that this study would enhance our understanding of the mechanism of turbulent flow in the turbulent layer at rotating conditions.

该实验使用平行的热线探针阵列来同时测量旋转直通道的非等温湍流边界层中的温度和速度场。雷诺数分别为15,000和25,000。转数分别为0、0.07、0.14、0.21和0.28。这项研究的目的是计算旋转的非等温湍流边界层中的湍流普朗特数。由于难以测量局部湍流普朗特数，因此本研究着重研究对数区域中的平均湍流普朗特数。在静态条件下，该值通常取为0.9。这项研究发现，旋转条件可以通过影响速度和温度边界层的性质来影响湍流的普朗特数。湍流普朗特数的变化范围大约为0.6-1.1。前侧的影响大于后侧的影响，尤其是在高转数下。这可以为数值模拟提供验证和指导。还讨论了湍流边界层内的其他信息。希望这项研究能加深我们对旋转条件下湍流层中湍流流动机理的理解。