论文标题
在非等温条件下旋转湍流边界层的温度和速度特性
Temperature and Velocity Characteristics of Rotating Turbulent Boundary Layers Under Non-Isothermal Conditions
论文作者
论文摘要
本文通过热线诊断来描述一项实验研究，该研究是在等温和非等热条件下旋转湍流边界层中速度和温度的特征。实验参数的范围为：雷诺数从10000到25000，旋转速度从0到150 rpm，y+从1.8到100。相对温度差为0.1。边界层中的详细速度和温度分布在旋转状态下测量，并提出了旋转下边界层分割的新标准。边界层理论在旋转状态下的适用性扩大。分析了科里奥利力和浮力对湍流边界层速度和温度分布的影响。发现科里奥利力在旋转下的边界层行为中起重要作用，因为它会移动速度和温度边界层。在等温条件下，可以根据优势力对这种效应进行分类：粘性，科里奥利或惯性。在非等温条件下，发生浮力。科里奥利力诱导的浮力抑制了科里奥利力的作用，抑制作用随温度差而增加。还获得了旋转下湍流prandtl数量PRT的变化。
This paper describes an experimental investigation, by means of hot-wire anemometry, of the characteristics of velocity and temperature in a rotating turbulent boundary layer under isothermal and non-isothermal conditions. The ranges of experimental parameters are: Reynolds number from 10000 to 25000, rotational speed from 0 to 150 rpm, and y+ from 1.8 to 100. The relative temperature difference is held constant at 0.1. Detailed velocity and temperature distributions in the boundary layer are measured in the rotating state, and a new criterion for boundary layer segmentation under rotation is proposed. The applicability of boundary layer theory under the rotating state is extended. The influence of Coriolis force and buoyancy on the velocity and temperature distributions in the turbulent boundary layers are analyzed. Coriolis force is found to play an important role in the behavior of the boundary layer under rotation, as it shifts the velocity and temperature boundary layers. Under isothermal conditions, such effects can be classified according to the dominant force: viscous, Coriolis, or inertial. Under non-isothermal conditions, buoyancy occurs. The buoyancy induced by the Coriolis force suppresses the effect of the Coriolis force, and the suppression effect increases with temperature difference. The variation of turbulent Prandtl number Prt under rotation is also obtained.
