Investigation on steam contact condensation injected vertically at low mass flux: Part I pure steam experiment
Investigation on steam contact condensation injected vertically at low mass flux: Part I pure steam experiment
复制标题
低质量通量垂直注入蒸汽接触冷凝研究：第一部分纯蒸汽实验
DOI：
10.1016/j.ijheatmasstransfer.2018.11.047
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发表时间：
2019
影响因子：
5.2
通讯作者：
Meng Zhaoming
中科院分区：
文献类型：
--
作者：
Li Weichao;Wang Jianjun;Zhou Yanmin;Sun Zhongning;Meng Zhaoming
蒸汽在过冷水中直接接触凝结是先进轻水堆压力抑制系统中不可避免的过程。在水蒸汽质量流量5-80 kg/m ~ 2s、水温19-96 ℃范围内进行了10次纯蒸汽实验。记录并分析了蒸汽凝结特性、流体振荡和压力振荡。由于瑞利-泰勒不稳定性，在气泡表面观察到显著的小气泡。非球面泡溃灭后出现涡环。通过连续采集的温度数据识别出了喘振的上限。得到了流体振荡的振幅和频率，并与以前的关联式进行了比较。识别出连续振荡和脉冲振荡两种典型的压力波形。脉冲振荡是由蒸汽泡溃灭引起的，在低水温下观察到。在喷嘴中测得的最大压力脉冲峰值约为1 MPa，在池中测得的最大压力脉冲峰值约为0.1 MPa。水池中的压力振荡强度先增大，然后迅速减小，再缓慢增大。在水温55-75 °C范围内有一个最大值，且随蒸汽质量流量的增加而增加。分析了压力振荡的主频，并与现有的关联式进行了比较。
Steam direct contact condensation in subcooled water is an inevitable process in pressure suppression system of advanced light water reactor. Ten pure steam experiments have been performed in the range of steam mass flux 5–80 kg/m2s and water temperature 19–96 °C. The steam condensation behave, fluid oscillation and pressure oscillation are recorded and analyzed. Prominent small bubbles are observed on the bubble surface due to the Rayleigh-Taylor instability. Vortex ring appears after aspherical bubble collapses. The upper threshold of chugging is identified by temperature data acquired continuously. The amplitude and frequency of fluid oscillation are obtained and compared with previous correlations. Two typical pressure wave shapes of continuous oscillation and pulse oscillation are identified. The pulse oscillation is induced by steam bubble collapse and observed at low water temperature. The maximum pressure pulse peak is about 1 MPa measured in the nozzle and 0.1 MPa in the pool. The pressure oscillation intensity in the water pool increases first, then decreases rapidly, and then increases slowly. It has a maximum at water temperature about 55–75 °C and the related temperature increases with the increment of the steam mass flux. The pressure oscillation dominant frequency is analyzed and compared with available correlations.