Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing

Hao CHEN; Jiawei LI; Hang SHI; Tong WANG; Fangzhou SONG; Tianyi WANG; Xianglei LIU

doi:10.13224/j.cnki.jasp.20210529

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Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing

Combustion,Heat and Mass Transfer | 更新时间：2025-03-14

- Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing
- Journal of Aerospace Power Vol. 37, Issue 8, Pages: 1597-1606(2022)
- 作者机构：
  
  1.中国航空发动机集团有限公司沈阳发动机研究所，沈阳 110015
  2.南京航空航天大学能源与动力学院，南京 210016
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20210529
  CLC：
- 稿件说明：
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Hao CHEN, Jiawei LI, Hang SHI, et al. Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing[J]. Journal of Aerospace Power, 2022, 37(8): 1597-1606.
DOI：

Hao CHEN, Jiawei LI, Hang SHI, et al. Numerical calculation and experimental test of heat radiation⁃ convection coupling heat transfer characteristics of turbine casing[J]. Journal of Aerospace Power, 2022, 37(8): 1597-1606. DOI： 10.13224/j.cnki.jasp.20210529.

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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