旋风除尘器内除主流外还存在着二次流现象，主要有短路流、纵向涡流、偏心环流等。
Besides the mainstream, there are still some secondary flow phenomena, such as short-circuit flow, vertical eddy and eccentric circulation vortex.
绝大多数年份季风建立时有环流突变发生，但也有少数年份呈调和变化或二次突变。
The onset of summer monsoon in South China Sea region is characterized by the abrupt change of flow field in most years, but a few years characterized by harmonic change(no abrupt transition).
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