纵横比为1.5时，气泡羽流中部的运动形态及结构极不稳定；
The pattern and structure in the middle part of bubble plume is instability when the aspect ratio of 1.5;
纵横比为2.0时，气泡羽流的顶端的运动形态及结构极不稳定。
The pattern and structure in the upper part of bubble plume is instability when the aspect ratio of 2.0.
对静止环境中的圆形气泡羽流流场进行数值模拟，得出了气泡羽流的流速场和浓度场。
Numerical simulation of round bubble plumes in still environment is performed to obtain the distribution of velocity and gas holdup.
对静止环境中的圆形气泡羽流流场进行数值模拟，得出了气泡羽流的流速场和浓度场。
Numerical simulation of round bubble plumes in still environment is performed to obtain the distribution of velocity and gas holdup.
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