Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing
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摘要:
开展了整环机匣的热辐射⁃对流耦合计算,获得了综合传热系数拟合关系式,并进行了实验测试验证。研究发现:封闭腔内,热辐射的存在大幅强化了壁面换热,辐射热流占总换热量比值可达90%以上。在3层机匣结构中,当发射率在0.3~0.8变化时,机匣沿径向方向上的温度梯度减小,主流区域的对流换热得到加强,半封闭区域对流强度降低。发射率为0.8时,外机匣流体侧壁面的辐射热流占总换热量的33.3%。
Abstract:The heat radiation⁃convection coupling calculation of the entire ring casing was carried out,the comprehensive heat transfer coefficient fitting relationship was obtained,and the experimental test was verified.The study found that the existence of heat radiation in the enclosed cavity greatly strengthened the wall heat transfer.The ratio of radiant heat flow to the total heat transfer can reach more than 90%.In the three⁃layer receiver structure,when the emissivity changed from 0.3 to 0.8,the temperature gradient in the radial direction of the receiver decreased,the convective heat transfer in the mainstream area was strengthened,and the convective intensity in the semi⁃enclosed area decreased.When the emissivity was 0.8,the radiant heat flow on the fluid sidewall of the outer casing accounted for 33.3% of the total heat transfer.
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Key words:
- turbine casing /
- casing experiment /
- natural convection /
- fluid⁃solid coupling /
- radiation heat transfer
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表 1 机匣内部通孔尺寸
Table 1. Through hole size inside the casing
孔道名称 尺寸/mm 个数 孔A 34(直径) 10 孔B 4(直径) 20 孔C (直径) 20 孔D 7 1(长×宽) 20 表 2 实验测量工况
Table 2. Experimental measurement condition
工况编号 进口流量/(kg/s) 内壁面加热温度/K 进口平均温度/K 1 0.07 600 285.7 2 0.07 700 287.4 3 0.1 600 285.6 4 0.1 700 287.8 表 3 不确定度分量汇总表
Table 3. Summary of uncertainty components
不确定度 不确定度来源 不确定度评定方式 标准不确定度/K 标准不确定度 热电偶 B类 数据采集系统 B类 合成不确定度 表 4 强迫对流区域的相关参数随发射率的变化
Table 4. Variation of relative parameters with emissivity in the forced convection region
发射率 /( ) ) 0.3 619.0 478.4 2 976.6 21.2 0.4 621.8 483.7 3 055.8 22.1 0.5 624.8 489.4 3 141.0 23.2 0.6 627.7 495.1 3 225.8 24.3 0.7 631.0 501.2 3 317.8 25.6 0.8 634.4 507.5 3 413.1 26.9 -
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