An Experimental Investigation of New Parameters for Predicting Turbulent Heat Transfer

在他们对边界层传热的研究中， 非常高的自由流湍流的存在，Macieboski和 Moffat（1990）得出结论， 湍流波动，u '，在 确定传热系数h。 但对于 他们所做的一系列实验，u'的值 与湍流均方根值高度相关 垂直于其传热表面的波动，v '。 的 这项研究的主要目的是建立一套 高自由流边界层流动 湍流，其中v'可以独立于u'变化， 为了通过实验来检验假设， 而不是u决定h。 同样的假设也将 通过测量湍流的各个分量来测试 利用热线技术， Blair和班尼特（1987年）建议，并试图 将它们与瞬时表面热通量相关联， 这将使用曼库索描述的技术来测量 和Diller（1991）。 湍流热通量的测量 湍流剪切应力也将由 自由流测试条件，以测试 边界层v ′与u ′ v ′无关假设 在存在高自由流湍流的情况下流动。

In their investigation of boundary layer heat transfer in the presence of very high free-stream turbulence, Maciejewski and Moffat (1990) conclude that the RMS value of the streamwise turbulent fluctuations, u', plays a dominant role in determining the heat transfer coefficient, h. However, for the set of experiments that they performed, the value of u' was highly correlated with the value of the RMS turbulent fluctuations normal to their heat transfer surface, v'. The primary goal of the proposed research is to establish a set of boundary layer flows in the presence of high free-stream turbulence for which v' may be varied independently of u' in order to test by means of experiments the hypothesis that v' and not u' determines h. This same hypothesis will also be tested by measuring the individual components of the turbulent fluctuations instantaneously, using the hot-wire techniques suggested by Blair and Bennett (1987), and attempting to correlated them with the instantaneous surface heat flux, which will be measured using a technique described by Mancuso and Diller (1991). Measurements of the turbulent heat flux and the turbulent shear stress will also be made for each of the free-stream test conditions in order to test the hypothesis that v' is independent of u'v' for boundary layer flows in the presence of high free-stream turbulence.