在垂直下降管内,以汽、水两相流为工质,对中压条件下绝热两相流的流型及截面含汽率、高压条件下沸腾两相流的流型及传热恶化特性(诸如传热恶化机理、临界干度、最大壁温飞升值及最小放热系数等)进行试验和理论研究,分析其规律及相互关系.并对中、高压汽水两相流流型(用光导探针、电导探针及压差脉动信号法判别)和截面含汽率(用光导探针、电导探针及快速关闭阀门法测量)的测试方法进行了研究. In the vertical drop pipe, using the steam and water two-phase flow as the working fluid, the flow pattern and the heat transfer deterioration characteristics of the two-phase flow under adiabatic two-phase flow under medium pressure and with the vapor content and pressure at the cross section Such as the mechanism of heat transfer deterioration, the critical dryness, the maximum wall temperature soaring value and the minimum exothermic coefficient, etc.) to conduct experimental and theoretical studies, and to analyze their regularity and interrelationships. Needle, conductivity probe and differential pressure pulse signal discrimination) and cross-section vapor content (using photoconductive probes, conductivity probes and rapid closure of the valve method) were tested.