具有离散出气孔的旋转盘冷却效果的实验

为了获得中心进气的冷气对具有离散出气孔的旋转盘的冷却效果,分别采用热色液晶和热电偶来测量转盘表面温度分布。影响冷却效果的主要因素是旋转雷诺数和冷气流量系数,分析了其对无量纲过余表面平均温度和无量纲径向表面温差的影响。随着旋转雷诺数和进气流量系数增加,转盘无量纲过余表面平均温度和无量纲径向表面温差全都下降。转盘上的通孔有利于对转盘的冷却,并且转盘通孔的尺寸越大,冷气对转盘的冷却效果越好。 

Cooling effectiveness of a rotating disk with discrete receiver holes

Modern gas turbine blades are cooled using air bleeded from the compressor.In a rotor-stator system,the cooling air enters at the center of the stator and flows radially outward,then leaves through the discrete receiver holes in the rotor and the clearance between the rotor and the shroud.The temperature distribution was measured by Thermal Liquid Crystal(TLC) and thermocouples on the rotor surface to acquire the cooling effectiveness.The influence of rotating speed and cooling mass flow rate on cooling effectiveness were analyzed.The dimensionless average temperature and dimensionless temperature difference of rotor surface decrease with both of the dimensionless mass flow rate and rotational Reynolds number are increased.The existence of receiver holes is of advantage to cooling rotor.The experiments show that the bigger the size of receiver holes is,the higher of cooling effectiveness will be.