Flow and heat transfer characteristics of hollow windward bend sandwich structure
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摘要:
为探究空心结构的流动换热特性，对具有高换热低流阻特性的迎风弯折（windward bend，WB）夹芯结构空心处理，得到空心迎风弯折（hollow windward bend，HWB）夹芯结构，采用数值方法研究了空心直径比（
d /D ）、导热系数比、雷诺数等参数对HWB结构流动换热能力的影响。结果表明：①空心迎风弯折结构能够以较低的换热损失作为代价，减轻较多的质量，当d /D =0.5时，质量减少了25%，但努塞尔数仅降低了5.5%；②HWB结构的导热系数比对间质换热与端壁换热的比值影响较大，提升导热系数比，间质换热相对于端壁换热会提升更多；③当d /D 较小时，相同固体率下的HWB结构与实心WB结构的流动换热能力基本相同，当d /D 增大至0.9时，HWB结构的流动换热能力略强于实心WB结构。Abstract:In order to explore the flow and heat transfer characteristics of the hollow structure, the windward bend (WB) sandwich structure with high heat transfer and low flow resistance was hollowed to obtain the hollow windward bend (HWB) sandwich structure. The effects of hollow diameter ratio (
d /D ), thermal conductivity ratio and Reynolds number on the flow and heat transfer characteristics of HWB structure were studied numerically. The results showed that: (1) the hollow windward bend structure can reduce more weight at the expense of lower heat transfer loss. Whend /D =0.5, the weight was reduced by 25%, but the Nusselt number was only reduced by 5.5%; (2) the thermal conductivity ratio of the HWB structure had a great influence on the ratio of the interstitial heat transfer to the end wall heat transfer. Increasing the thermal conductivity ratio, the interstitial heat transfer could increase more than the end wall heat transfer; (3) whend /D was small, the flow and heat transfer capacity of HWB structure and solid WB structure was basically the same at the same solid rate; whend /D increased to 0.9, the flow and heat transfer capacity of HWB structure was slightly stronger than that of solid WB structure. -
图 5 网格无关性验证（Re=
1000 ，ks/kf=100）Figure 5. Grid independence investigation （Re=
1000 , ks/kf=100）
图 6 不同空心直径比d/D对HWB结构NuL的影响
Figure 6. Effect of different hollow diameter ratio d/D on NuL of HWB structure
图 7 导热系数比对HWB结构NuL的影响
Figure 7. Effect of thermal conductivity ratio on NuL of HWB structure
图 8 HWB结构端壁换热与间质换热对比
Figure 8. Comparison of interstitial heat transfer and endwall heat transfer of HWB structure
图 9 相同固体率的HWB结构与实心WB结构
Figure 9. HWB structure and solid WB structure with the same solid ratio
图 10 HWB结构与实心WB结构的流动换热性能对比
Figure 10. Comparison of flow and heat transfer performance between HWB structure and solid WB structure
图 11 相同固体率的HWB结构和实心WB结构基于相同泵功率下的NuL
Figure 11. NuL of HWB structure and solid WB structure with the same solid ratio at the same pumping power
表 1 计算域尺寸表
Table 1. Calculation domain size
参数 数值 L/mm 25 W/mm 2.5 H/mm 5 $ \alpha $/（°） 45 D/mm 1 d/D 0.2, 0.3, 0.5, 0.7, 0.8, 0.9 质量损失 0.04, 0.09, 0.25, 0.49, 0.64, 0.81 $ {d}_{\mathrm{s}} $/mm 0.98, 0.95, 0.87, 0.71, 0.6, 0.436 
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表 2 物性参数
Table 2. Physical parameter
参数 数值 桁架杆 空气 导热系数$ k $/（$ \mathrm{W}/ （\mathrm{m}\cdot \mathrm{K}） $） 29 0.029 密度$ \rho / （ $k$ \mathrm{g}/{\mathrm{m}}^{3}） $ 2719 1.1 比定压热容$ {c}_{p}/ $（$ \mathrm{J}/ （\mathrm{k}\mathrm{g}\cdot \mathrm{K}） $） 871 1005 动力黏度μ/10−5 $ （\mathrm{k}\mathrm{g}/ （\mathrm{m}\cdot \mathrm{s}） ） $ 2
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