Flow characteristics experiment of plate-fin heat exchanger in wind tunnel
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摘要: 针对风洞板翅式热交换器，开展了其在风洞运行工况下气体流动特性的研究。对比了板翅式热交换器和椭圆翅片管热交换器的扰流和压损特性，利用试验研究了不同来流风速、不同上游扰流片角度等条件下热交换器下游湍流发展变化规律，开展了封条、模块拼接缝等特征结构对气流扰动的影响研究。研究结果表明：该型板翅式热交换器相比椭圆翅片管热交换器，其对气流扰动更小，相同换热工况下压力损失也大幅减小；板翅式热交换器具有较好的整流作用，其后的气流扰动主要由自身结构决定，与来流条件关系不大，其中厚度较大的结构对气流的扰动会传播更远，需要设计合理的整流方案以减小扰动。Abstract: The flow characteristics of a plate-fin heat exchanger in the wind tunnel were studied. Firstly, the turbulence characteristics and pressure loss of the plate-fin heat exchanger and the finned oval tube heat exchanger were compared, and then the turbulence developments downstream of the heat exchanger under different inflow wind speeds and spoiler angle conditions were studied by experiments. Finally, the impacts of typical structures on the flow disturbance downstream of the heat exchanger were obtained. The results show that the plate-fin heat exchanger has less disturbance to the air flow and much smaller pressure loss under the same heat transfer condition than the finned oval tube heat exchanger. The plate-fin heat exchanger has good rectifying effect, and the flow disturbance, which has little relation with the incoming flow conditions, is mainly determined by its own structures. The disturbance of the large thickness structures in the heat exchanger propagates long distances, and a proper rectifier scheme is needed to reduce the disturbance.
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图 5 板翅式热交换器试验件基本结构
Figure 5. Basic structure of plate-fin heat exchanger test specimen
图 6 试验件关键结构示意图
Figure 6. Schematic diagram of the key structures of the test specimens
图 8 不同结构型式热交换器下游流向湍流强度分布
Figure 8. Distribution of flow direction turbulence at downstream cross sections of different type heat exchangers
图 9 不同结构型式热交换器下游流向速度分布
Figure 9. Distribution of flow direction velocity at downstream cross sec- tions of different type heat exchangers
图 10 不同结构型式热交换器下游横向湍流强度分布
Figure 10. Distribution of lateral turbulence at downstream cross sec-tions of different type heat exchangers
图 11 不同结构型式热交换器下游横向速度分布
Figure 11. Distribution of lateral velocity at downstream cross sections of different type heat exchangers
图 12 5个截面的湍流强度平均值
Figure 12. Average values of turbulence at the five downstream cross sections of different type heat exchangers
图 13 不同风速下热交换器下游流向湍流强度分布
Figure 13. Distribution of flow direction turbulence at downstream cross sections of heat exchanger under different velocity conditions
图 14 不同风速下热交换器下游截面横向湍流强度分布
Figure 14. Distribution of lateral direction turbulence at downstream cross sections of heat exchanger under different velocity conditions
图 15 不同扰流片角度热交换器入口流向湍流强度分布
Figure 15. Distribution of flow direction turbulence at inlet cross section of heat exchanger under different spoiler angle conditions
图 16 不同扰流片角度热交换器入口流向速度分布
Figure 16. Distribution of flow direction velocity at inlet cross section of heat exchanger under different spoiler angle conditions
图 17 不同扰流片角度热交换器下游流向湍流强度分布
Figure 17. Distribution of flow direction turbulence at downstream cross sections of heat exchanger under different spoiler angle conditions
图 18 不同扰流片角度热交换器下游流向速度分布
Figure 18. Distribution of flow direction velocity at downstream cross sections of heat exchanger under different spoiler angle conditions
图 19 封条整流对下游流向湍流强度的影响
Figure 19. Effect of seal on downstream flow direction turbulence
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