模拟涡轮旋转叶片冷却通道换热的初步实验研究

随着先进的动力装置向高推重比发展,涡轮前燃气的进口温度也越来越高,不但导向叶片需要高技术的冷却,转子叶片也必须进行相应的冷却。但是,以往的冷却研究大部分都建立在静止叶片的基础上,而对转子叶片却研究甚少。事实上.只有对旋转冷却通道换热进行系统的研究,才有可能对整个冷却系统作更精确更有效的设计。为此,旋转冷却系统的研究正成为越来越重要的课题。

AN EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER IN ROTATING COOLANT CHANNELS

This paper deals with a facility and an experimental technique for researching the heat transfer of coolant channels in the rotating turbine blade, and presents the preliminary results of the convective coefficient of the flow parallel to the axis in the rotating conditions. The results show that the effect of rotating on heat transfer is highly enhanced by centrifugal and Coriolis forces. In the conditions of the present tests (Re = 6. 4×10⁴, n= 1000rpm. ), the Nusselt number in the rotating state in about 20 percent higher than that in the stationary case.