压缩波在减速流中变陡。
结果表明：当环境流中弱二次切变强度增加（减少）时，扰动动能的最大值增加（减小），扰动动能的变化加速（减速）；
The result indicates:when the weakly secondary shear grows(decays), the maximum value of the perturbation kinetic energy also grows(decays), and the change of the energy accelerates(slows).
输送带煤流采样机是以电机为动力，通过减速器及链轮传递驱动力，利用大链轮上的挡杆使偏心轮重心上移的传动系统。
The machine is the transmission system with motor as power that transmits drive through gear reducer, sprockets, and uses the rod on big sprocket that makes the focus of partial ship moving upwardly.
双级减速器除了存在单级的传动问题以外，还有外形尺寸协调、传动比分配、功率流分流及机构平衡等问题。
Besides existing the single transmission questions, two grades of reducer have other problems, such as dimension coordinate, transmission radio distribute, power flow direction and balancing.
提出采用可控减速法设计离心风机两元叶片，即通过三维黏性流场计算，采用正交试验设计方法，以确定流道内平均速度的减速规律和叶片型线。
In the present method, the orthogonal design and the three-dimensional viscous flow field computation were used to determine the optimum controlled deceleration flow in impellers and the blade curves.
在蜗壳中，液体由于流道的逐渐扩大而减速，又将部分动能转变为静压能，最后以较高的流入排出管道，送至需要场所。
In the volute, the flow of liquid due to the gradual slowdown in the expansion, part of kinetic energy will change as pressure to end the higher inflow from the pipeline, sent to the need for places.
在蜗壳中，液体由于流道的逐渐扩大而减速，又将部分动能转变为静压能，最后以较高的流入排出管道，送至需要场所。
In the volute, the flow of liquid due to the gradual slowdown in the expansion, part of kinetic energy will change as pressure to end the higher inflow from the pipeline, sent to the need for places.
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