风洞板翅式热交换器气体流动特性试验

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,...

Flow characteristics experiment of plate-fin heat exchanger in wind tunnel

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.