The exhaust channel unit has an annularshape and is coupled to the upper end of the main body.
排气通道单元具有环形形状并且被连接到主体的上端。
2
Compared comprehensively, enclosed supports are better than non-enclosed supports; supports of square annularshape or "u" shape are better than supports of semicircle arch.
综合比较来看，封闭式支架要优于不封闭支架；马蹄形或方环形支架要比半圆拱等支护形式好。
3
The result shows that thecorrugation and annular flow field is closely related with the shape of flow channel.