... 二取代衍生物：bifunctionalized derivatives 二次压力梯度：quadratic pressure gradient 二乙氧基甲烷：DEM ...
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水力机械的分离为三维流动，三维流动的侧向压力梯度产生边界层的二次流动。
The separation flow is three dimensional in hydraulic machine. The pressure gradient in cross direction produces secondary flow in boundary layer.
讨论了曲率和挠度对二次流动、流函数等值线和轴向速度的影响，研究了不同曲率和挠度螺旋管道内流量与压力梯度之间的关系。
The effects of curvature and torsion on secondary flow, isoline of stream function and distribution of the axial velocity of flow were discussed.
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