和矩形结构相比，同样的工况下，渐扩结构射流轴向速度较小，径向速度较大。
Compared with rectangular chamber, the axial expansion velocity is small and radial expansion velocity is big in stepped-wall chamber under the same conditions.
计算结果表明，滑移边界条件的处理能显著改善干熄炉渐扩段的模拟；
The calculated results show that the disposal of slip boundary condition can substantially improve the simulation in expanding section of CDQ chamber;
研究了渐缩自由桩和渐扩自由桩的桩顶纵向振动速度时域曲线特征；
The frequency response function, frequency-domain and time-domain expressions for the longitudinal vibration velocity at the pile top were obtained further.
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