为探究混合工质在矩形螺旋管式换热器中凝结换热性能，建立了矩形截面螺旋管中含不凝气体乏气凝结换热数值模型，讨论了设计工况下混合工质的凝结换热特性及流动特性以及不凝气体组分比例和模型结构宽高比对其的影响。结果表明：受离心力影响，螺旋管沿程热流密度呈先减小后增大的趋势；冷凝水在冷凝后期形成了环状流和柱塞流，有效增强通道内乏气与外壁面的换热性能；不凝气体组分比例越大，螺旋管冷凝后期热流密度受到抑制作用越强，换热效果越差；当通道宽高比大于1时，螺旋管通道内二次流强度较大，乏气换热效果更好。

In order to explore the condensation heat transfer performance of the mixed working fluid in the rectangular spiral tube heat exchanger, a numerical model of condensate heat transfer with non-condensable gas in the rectangular cross-section spiral tube was established, and the condensation heat transfer characteristics and flow characteristics of the mixed working fluid under the design conditions, as well as the influence of the proportion of non-condensable gas components and the aspect ratio of the model structure on it were discussed. The simulation results show that the heat flux density of the spiral tube decreases first and then increases under the influence of centrifugal force. In the late stage of condensation, condensate forms annular flow and plunger flow, which effectively enhances the heat exchange performance of exhausted gas in the channel and the outer wall. The larger the proportion of non-condensable gas components, the stronger the inhibition effect of heat flux density in the condensation stage of the spiral tube, and the worse the heat exchange effect. When the width-to-height ratio of the channel is greater than 1, the secondary flow intensity in the spiral tube channel is larger, and the heat exchange effect of exhaust gas is better.