含有不凝气蒸汽直接接触凝结引起的热工参数振荡和热质传递恶化，日益受到广泛关注。本项目以含有不凝气蒸汽管内直接接触凝结热质传递机理揭示为目标导向，剖析气液凝结界面处热质传递机制，构建含有不凝气蒸汽直接接触凝结“双元双阻力”凝结模型；通过可视化实验，分析气液界面演变规律、两相流流动特征，提出凝结流型转捩判据；基于“双元双阻力”凝结模型，对实验工况下的凝结过程进行数值模拟，数值结果能够“复现”实验现象，进而对温度和压力振荡特征进行表征，发展适用于含有不凝气蒸汽凝结流型相图、传热传质系数关联式。较纯蒸汽接触凝结不同，本项目紧密围绕不凝气组分随着凝结过程持续增加，导致凝结界面热质传递恶化的机理揭示这一关键科学问题，在构建不凝气与凝结现象、温度和压力振荡特征、热质传递规律的内在关联方面，形成研究特色和创新，为探究含有不凝气蒸汽直接接触凝结诱发热工参数振荡及热质传递恶化致因本质奠定一定的理论基础。

Oscillation of thermal parameter and deterioration of heat and mass transfer induced by direct contact condensation of steam with non-condensable gas is increasingly paid more and more attention. This project is to reveal mechanism of heat and mass transfer of direct contact condensation of steam with non-condensable gas in a tube as the objective orientation, to analyze the mechanism of heat and mass transfer on the condensation interface of gas and liquid, to establish a dual component-double resistance model for direct contact condensation of steam with non-condensable gas. Analysis of evolution law of gas-liquid interface and flow characteristics of two-phase flow are completed through visual experiment and transition criterion of condensation pattern is proposed. Based on the dual component-double resistance condensation model, condensation is numerically simulated for experiment case in order to reproduce experiment phenomena by numerical result, and then characteristics of temperature and pressure oscillations are characterized. Condensation pattern map and correlations of mass and heat transfer coefficient are developed for steam direct contact condensation with non-condensable gas. With Difference from pure steam direct contact condensation, this project focuses on mechanism reveal of component increase of non-condensable gas during the condensation as key scientific problem, which causes deterioration of heat and mass transfer. Establishment of internal connection of non-condensable gas and condensation phenomenon, characteristics of temperature and pressure oscillations, and rule of heat and mass transfer forms the research feature and innovation to explore the nature cause and to establish some theoretical foundation of thermal parameter oscillations and deterioration of heat and mass transfer during steam direct contact condensation due to non-condensable gas.