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.
火羽流涡旋结构的详细分析对火灾蔓延特性的研究有重要指导意义。
Detailed analysis of vortical structure in fire plume has an important significance in the research of the spread of fire.
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;
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