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实际的中心进气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 ,主要是转速变化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 2 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 ;转速增加使盘面平均努赛尔特数增大 ;在给定时间内转速增至最大后使系统稳定还是分段使系统稳定后再增加转速 ,对盘面平均努赛尔特数的影响不是特别明显。
The actual central intake turbine disk is simplified as a rotating disk model heated by the center inlet air inlet. The flow and heat transfer characteristics of the cold air near the turbine rotating disk under unsteady conditions are studied experimentally, The effect of temperature and disk average Nusselt number. The effective radius of the turntable is 200 mm, the maximum speed is 3 000 r / min and the heating power is 100 000 W. The experimental results show that the rate of change of temperature in the rim region over time is greater than the rate of change of temperature in the central region over time. Increasing the rotational speed increases the average Nusselt number of the disk surface. When the rotational speed increases to the maximum in a given time, The stability of the system after the sub-section to increase the speed, the average number of Nusselt effect on the disk surface is not particularly obvious.