Abstract Effect of sidewall on the thermal characteristics of a three dimensional turbulent wall jet with a square nozzle is explored experimentally. The mean and fluctuating quantities are presented through temperature decay, thermal half widths and temperature fluctuation. It is observed that the decay rate of centerline bottom wall temperature of without sidewall is almost half than the corresponding case with the sidewall. The sidewall influences the temperature variation drastically. As a result, the asymptotic nature of temperature is lost. Also, the thermal half width in wall normal direction varies non-linearly as compared to the linear variation for the case without sidewall. The side infiltration is more dominant than the top infiltration in the near field region for both the cases. But, the sidewall plays an important role in suppressing the fluctuation at the far downstream locations. In addition, several correlations are proposed for the mean thermal parameters of the three dimensional turbulent jet.

中文翻译：

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有侧壁和无侧壁的三维湍流壁射流的热特性

摘要 实验研究了侧壁对方形喷嘴三维湍流壁射流热特性的影响。平均和波动量通过温度衰减、热半宽度和温度波动来表示。观察到，无侧壁的中心线底壁温度的衰减率几乎是有侧壁的相应情况的一半。侧壁严重影响温度变化。结果，温度的渐近性质丢失了。此外，与没有侧壁的情况的线性变化相比，壁法线方向的热半宽度非线性变化。在这两种情况下，在近场区域中，侧面渗透比顶部渗透更占优势。但，侧壁在抑制远下游位置的波动方面起着重要作用。此外，对三维湍流射流的平均热参数提出了几种相关性。