【摘要】 凹凸板式换热器作为一种新型高效换热设备，其强化传热效果在于其板片的结构。鉴于不凝气的掺入对蒸汽在换热器内的冷凝传热效果也会产生影响，通过数值模拟对凹凸板换热器内含不凝气蒸汽冷凝特性进行研究。采用控制变量法研究了不凝气含量、凹凸台高度、间距以及倾角对凹凸板换热器冷凝传热的影响。结果表明，当不凝气体积分数从0增大到30%时，蒸汽冷凝水质量分数降低了41.05%。通过分析不同凹凸板片参数对换热器内冷凝换热的影响，发现冷凝水质量分数会随凹凸台间距增大而增大、凹凸台倾角减小而增大，随着凹凸台高度先增加后减少。当凹凸台间距为1.3mm，凹凸台高度为4 mm，凹凸台倾角为130°时，凹凸板换热器综合传热效果最好。更多还原

【Abstract】 Concave-convex plate heat exchanger is a new type of high efficiency heat transfer equipment, its enhanced heat transfer effect lies in its plate structure. In view of the incorporation of non-condensable gas will also affect the condensing heat transfer effect of steam in the heat exchanger, so the condensation characteristics of steam containing non-condensable gas in concave-convex plate heat exchanger are studied by numerical simulation. The control variable method is used to study the influence of non-condensable gas content,height, spacing and angle of concave-convex plate heat exchanger on condensing heat transfer through numerical simulation. The simulation results show that when the content increases from 0 to 30%, and the mass fraction of steam condensate water decreases by 41.05%. By analyzing the influence of different concave-convex plate parameters on the condensation heat transfer in heat exchanger, it is found that the mass fraction of steam condensate water increases with the distance between concave-convex platforms, and the angle of concave-convex platform decreases, and it increases first and then decreases with the height of concave-convex platforms. When the distance between concave-convex plate is 1.3 mm, the height of concave-convex plate is 4 mm, and the angle between concave-convex plate is 130°, the concave convex plate heat exchanger has the best heat transfer effect.更多还原