Effects of finned structure on flow and heat transfer characteristics in vortex cooling of turbine blade
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摘要:
为了探究肋片结构对旋流冷却进气腔和旋流腔内冷却气体流动和换热特性的影响，建立了六种不同的带肋旋流冷却模型，在相同的边界条件下对比分析了6种结构的流动换热特性和综合换热性能的差异。结果表明：在进气腔靶面加肋片能使进气腔靶面换热强度明显增强，而且肋片对进气腔整体流动的扰流影响较小；在旋流腔靶面加肋片增强了旋流腔靶面换热强度，并且提高了旋流腔内综合换热因子。在6种结构中，进气腔靶面上加45°斜肋并且旋流腔靶面加90°环肋的结构获得了最高的靶面总换热量和旋流腔内综合换热因子；与不加肋的旋流冷却结构相比，两个靶面的总换热量提高了51.8%，旋流腔内综合换热因子提高了3.44%。
Abstract:In order to investigate the influence of the flow and heat transfer characteristics on vortex cooling with different finned structures in the intake cavity and vortex cooling chamber, six different models with finned structure were built. The flow characteristics, the heat transfer characteristics, and the comprehensive heat transfer performance of these six models were compared and analyzed under the same boundary conditions. The results showed that the heat transfer intensity of the target in the intake cavity increased obviously when finned structure was added to the intake cavity. When finned structure was added to the vortex chamber target surface, the heat transfer intensity and comprehensive heat transfer factor of the target in the vortex cooling chamber were enhanced a lot, too. Among these six models, the model with 45° oblique fins on the intake cavity and 90° fins on the vortex cooling chamber had the highest total heat transfer and comprehensive heat transfer factor, the total heat transfer of the two targets was 51.8% higher than that of the non-finned model, the comprehensive heat transfer factor was 3.44% higher than that of the non-finned model.
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图 1 旋流冷却在实际叶片前缘的示意图
Figure 1. Diagram of vortex cooling at the leading edge of an actual turbine blade
图 2 部分旋流冷却结构三维模型
Figure 2. Three-dimensional model of partial vortex cooling structure
图 5 结构5（90°i-90°v）Nuai、Nuav随网格数量的变化
Figure 5. Nuai，Nuav of model 5 （90°i-90°v） with the number change of grids
图 9 6种结构不同截面的VYZ云图及流线图
Figure 9. VYZ contours and streamlines of six models with different planes
图 10 6种结构Cp在旋流腔腔内沿轴向分布
Figure 10. Cp of six models are distributed along the axial direction in the vortex cooling chamber
图 11 6种结构旋流腔内压力分布云图及流线图
Figure 11. Pressure contours and streamlines of six models in the vortex cooling chamber
表 1 6种结构靶面换热量Φi、Φv、Φt的对比
Table 1. Comparison of Φi, Φv, Φt in the target surface of six models
参数 结构 i-v 90°i-v 45°i-v i-90°v 90°i-90°v 45°i-90°v Φi/W 65.4 88.4 128.7 65.9 87.8 131.8 Φv/W 222.6 218.7 203.7 320.3 309.3 305.3 Φt/W 288 307.1 332.4 386.2 397.1 437.1 
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表 2 6种结构旋流腔内的Nuav、f、η的对比
Table 2. Comparison of Nuav，Nu0，η in the vortex chamber of six models
参数 结构 i-v 90°i-v 45°i-v i-90°v 90°i-90°v 45°i-90°v Nuav 125.4 115.1 107.1 147.5 139.1 140.6 f 0.161 0.151 0.142 0.260 0.226 0.220 η 0.871 0.814 0.749 0.881 0.878 0.901
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