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首页> 外文期刊>International Journal of Heat and Fluid Flow >Heat transfer and skin-friction in a turbulent boundary layer under a non-equilibrium longitudinal adverse pressure gradient
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Heat transfer and skin-friction in a turbulent boundary layer under a non-equilibrium longitudinal adverse pressure gradient

机译：在非平衡纵向不良压力梯度下在湍流边界层中传热和皮肤摩擦

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摘要

The experimental data on the effect of weak and moderate non-equilibrium adverse pressure gradients (APG) on the parameters of dynamic and thermal boundary layers are presented. The Reynolds number based on the momentum thickness at the beginning of the APG region was Re-** = 5500. The APG region was a slot channel with upper wall expansion angles from 0 to 14 degrees. The profiles of the mean and fluctuation velocity components were measured using a single-component hot-wire anemometer. The friction coefficients were determined using two methods, namely, the indirect Clauser method and the direct method of weighting the lower wall region on a single-component strain-gage balance. The heat transfer coefficients were determined by a transient method using an IR camera. It is noticed that in the pressure gradient range realized the universal logarithmic region in the boundary layer profile is conserved. The values of the relative (divided by the parameters in zero gradient flow at the same value of Re-**) friction and heat transfer coefficients, together with the Reynolds analogy factor, are determined as functions of the longitudinal pressure gradient. The values of the relative friction coefficient reduced to c(f)/c(f0) = 0.7 and those of the heat transfer to St/St(0) = 0.9. A maximum value of the Reynolds analogy factor (St/St(0))/(c(f)/c(f0)) = 1.16 was reached for the pressure gradient parameter beta = 2.9.
机译：提出了关于动态和热边界层参数的弱和中等非平衡不利压力梯度（APG）的实验数据。基于APG区域的开头的动量厚度的雷诺数是RE - ** = 5500.PAG区域是具有0至14度的上壁膨胀角的槽通道。使用单组分热线风速计测量平均和波动速度分量的轮廓。使用两种方法确定摩擦系数，即，间接克劳师方法和在单组分应变计平衡上加权下壁区域的直接方法。通过使用IR相机的瞬态方法确定传热系数。注意到，在压力梯度范围内实现了边界层轮廓中的通用对数区域。相对（除以零梯度流量的参数的值与Re-**）摩擦和传热系数的相同值不同，与雷诺比数因子一起被确定为纵向压力梯度的功能。相对摩擦系数的值减小到C（f）/ c（f0）= 0.7和热传递到st / st（0）= 0.9的值。对于压力梯度参数β= 2.9，达到了雷诺比的比较因子（ST / ST（0））/（C（F）/ C（F0））= 1.16的最大值。

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