机载三股流板翅式冷凝器数值计算与实验研究

Numerical Calculation and Experimental Investigation on Airborne Three-Stream Plate-Fin Condenser

分析了翅片、隔板和流体的传热规律,采用有限容积法建立了包含相变流和交叉式在内的多股流板翅式换热器数学模型。基于蒸发制冷循环试验台,在4种工况条件下对机载交叉式三股流板翅式冷凝器换热性能进行了实验,并在特定工况下,通过温度场分析了各股流体间的换热特性。经数值计算与实验结果的对比,流体换热量的最大相对误差为8.08%,满足工程设计计算需求。通过定性分析,认为流体流量分配不均、相变流体潜热以及相变对流表面换热系数的计算是误差的主要来源。

Heat transfer mechanisms of fin, plate and fluid are analyzed and the mathematical model of multi-stream plate-fin heat exchanger containing fluid phase change and cross flows between different fluids is established by finite volume method. Experimental research on heat transfer performance of air- borne three-stream plate-fin condenser in four different operating conditions is conducted on the experimental evaporative cooling circulatory system. And then heat transfer characteristics between each fluid in specific operating condition are analyzed by the fluid temperature field. Besides, comparison between experimental and numerical results shows that the biggest relative error of heat exchange volume is 8.08%. It demonstrates that numerical calculation method can meet the requirements of engineering design. By qualitative analysis, the calculation errors are mainly influenced by flow un-uniform distribu- tion, the calculation for latent heat and the surface convection heat transfer coefficient for phase change liquid.