中文摘要：

催化燃烧蒸发器作为一种强化传热的有效手段，具有高效、结构紧凑和易放大等优点．催化燃烧蒸发器中的浓度场分布对其传热性能具有重要的影响．运用多空介质模型对燃烧蒸发器内部流体分布特性进行了CFD模拟，分析计算了冷态时N2和H2在混合腔内浓度的分布特性，同时进行了实验验证．模拟和实验结果具有相同的变化趋势，而且结果表明不同空速下燃烧蒸发器中存在较大的浓度分布不均匀性，改变出口位置对浓度场的分布具有一定的改善作用．通过对燃烧腔中浓度场分布的模拟为燃烧蒸发器的进一步优化设计提供了理论依据．

英文摘要：

A highly compact plate-fin catalytic combustion heat exchanger （CCHE） derived from plate-fin heat exchanger, which coupled exothermic reaction with evaporation was proposed. The configuration of plate-fin offered a high degree of compactness, minimized heat transport resistance and favored scaleup. Uniform concentration distributions contributed to further enhancement of the heat efficiency of CCHE. A porous media model was adopted to study the concentration distributions under diverse space velocities and pressure-outlet positions by using cold test and three-dimensional computational fluid dynamics （CFD） simulations. The computational and experimental results indicated that fluid flow maldistribution was significant under various GHSV. Some improvements on distributions could be achieved by changing the location of off-gas outlet. However novel distributors should be developed. Comparison of experimental measurements and simulations showed similar trends. Consequently simulations on concentration distributions in the combustion chamber provided a guidance for further improvement.