高温涡轮叶片液冷机理的试验研究

本文在文献 1]的基础上 ,用水为冷却介质 ,用均匀受热的倾斜与水平管模拟涡轮叶片冷却通道 ,研究其沿程流型和换热系数的变化及其相互关系 ,得出在各种倾斜角度、热流密度和进口冷液参数下 ,对饱和沸腾起始点 ZB与环状流起始点 ZN 的影响及对 ZB与 ZN 控制的经验公式。研究结果表明 ,汽液两相沸腾环状流区的换热系数比单相液流区提高近两个数量级 ,而且倾斜与水平管轴的上半部分各流型区的转换点均比下半部分提前 ,因此在实际应用时应以上半部分的“蒸干点”作为“烧毁”的控制点

EXPERIMENTAL INVESTIGATION ON LIQUID-COOLING MECHANISM FOR TURBINE VANE

The experimental investigation on liguid cooling mechanism was carried out with water through an even-heated adiabatic straight pipe.The flow pattern,the heat transfer coefficient along full-flow-path,and the correlation between them,have been studied.In order to imitate the actual working conditions of the cooling passage of turbine vane,the heat transfer flux,the coolant inlet parameters,and the pipe angle are changeable.Some empirical formulas for come-to-saturated point Z B and come-annular point Z N have been derived and several useful conclusions have been drawn for engineering application.