管内旗形件后掠角对油类介质对流换热的影响

The Influence of Sweep Angle on the Forced Convection of oil in a Tube with Flag-type Insert

实验研究了水平圆管内插入旗形件时其后掠角对３０＃透平油的对流传热及流阻特性的影响。实验圆管为φ２４ｍｍ×２ｍｍ×７００ｍｍ的紫铜圆管，后掠角为８６°，８１°，７６°，７０°，６５°五种。其它参数范围为：１４６≤Ｐｒ≤２０６，１０６７≤Ｒｅ≤６８５７，０．０７＜ｃｏｓ＜０．４２。实验范围内，换热系数首先随后掠角的增大而上升，然后又下降，在后掠角７６°左右呈现出最佳值，阻力则随后掠角的增加而增加。

Experimental study of forced convection heat transfer in a horizontal circulartube with flag-type insert is performed to in vestigate the characteristics of fluid flow and heattransfer as well as the influence of the sweep an8le of flag-type insert.The working fluid is 30#turbine oil.In experiment,when sweep angle φincreases the heat transfer coefficient increases atthe beglnning and shows the highest value at = 76°,then drops down,However,flow resistanceforce increases all the time.