论文部分内容阅读
实际中心进气的气冷涡轮盘被简化成中心进气外缘加热的旋转盘模型 ,以实验的方法研究了涡轮旋转盘附近冷气在非定常情况下的流动与换热特性 ,主要是冷气量对盘面温度和盘面的平均努赛尔特数的影响。转盘的有效半径为 4 0 0 mm,最大转速为 3 0 0 0 r/ min,加热功率为 1 0 0 0 W。实验结果表明 :盘缘区域温度随时间的变化率大于中心区域温度随时间的变化率 ;流量的改变 ,盘面平均努赛尔特数亦随之发生较快的改变 ;某一工况下对转盘进行加热 ,稳定后 ,停止加热 ,盘面平均努赛尔特数从一个很大的数值逐渐减小 ,然后再逐渐增大。
The actual central air-cooled turbine disk is simplified to a rotary disk model heated by the center inlet air. The flow and heat transfer characteristics of the cold air near the turret disk under unsteady conditions are studied experimentally. Effect on disk temperature and average Nusselt number of disk. The effective radius of the turntable is 400 mm, the maximum speed is 3000 rpm, and the heating power is 10 000 W. The experimental results show that the rate of temperature change over time in the edge of the rim is larger than the rate of change of the temperature in the center over time. When the flow rate changes, the average Nusselt number of the surface also changes rapidly. After heating, stabilizing, heating is stopped and the average Nusselt number on the disk decreases from a very large value and then gradually increases.