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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。
The heat transfer rules of fins, bulkheads and fluids were analyzed. The mathematical model of multi-flow plate-fin heat exchangers including phase change flow and cross flow was established by finite volume method. Based on the evaporative refrigeration cycle test bench, the heat transfer performance of airborne cross-flow plate-fin condenser was tested under four operating conditions. Under certain operating conditions, Heat transfer characteristics. Comparing the numerical results with the experimental results, the maximum relative error of fluid heat transfer is 8.08%, which meets the engineering design and calculation requirements. Through qualitative analysis, it is considered that the distribution of fluid flow is not uniform, the latent heat of phase change fluid and the heat transfer coefficient of phase change convection surface are the main sources of error.