741. 蒸気の液中凝縮に伴う圧力変動,(II)
741. 蒸気の液中凝縮に伴う圧力変動,(II)
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DOI：
10.3327/jaesj.24.466
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发表时间：
1982-06
期刊：
影响因子：
--
通讯作者：
真一 福田
中科院分区：
文献类型：
--
作者：
真一 福田
通过实验了解了在大蒸汽质量流量下出现的压力振荡现象。通过对压力数据的统计分析和高速电影摄影机的观察，阐明了这种现象的本质。在压力波动区域，压力波动的主频与液体过冷度成正比，与排气管内径成反比，与排气系统液柱的固有频率关系不大。压力的变化与排气管出口周围蒸汽质量形状的周期性变化相一致。这些经验事实是从实验中得出的，其参数为液体温度，蒸汽流量，通风管长度和通风管内径。在压力变化变得非常小的区域中，在通风管出口周围没有观察到蒸汽质量的大的形状变化。上述观测结果表明，压力变化与排气管出口附近蒸汽质量的形状和行为密切相关，主频率取决于排气管出口附近蒸汽质量的尺度。
The experiments were performed to know the pressure oscillation phenomena which are realized at large vapor mass flow flux. The nature of the phenomena was clarified through the statistical analysis of pressure data and observation by high speed cine camera. In the region where pressure variation becomes oscillatory, the dominent frequency of the pressure variation was in proportion to the degree of liquid subcooling temperature and in reverse proportion to vent tube inner diameter, and it had very little relation to the natural frequency of the fluid column in the vent system. Pressure variations were in good accordance with the periodical shape change of the vapor mass around the vent tube outlet. These empirical facts were derived from the experiments whose parameters were liquid temperature, vapor flow rate, vent tube length and vent tube inner diameter. In the region where pressure variations becomes very small, a large shape change of the vapor mass was not observed around the vent tube outlet. The observations mentioned above indicate that the pressure variations have close relation to the shape and behavior of vapor mass around the vent tube outlet and that the dominant frequency depends on the scale of vapor mass around the vent tube outlet.