The drag reduction of plane-surfaces with V-shaped grooves is given out by direct numerical simulation, and the drag reduction mechanism in the base of the secondary flow theory is suggested.
利用直接数值模拟方法求得平板上V—型条纹表面上的降阻情况，并给出基于二次流动理论的降阻机理。
The last, through experiments of flume and water tunnel, the liquid slip effect on drag-reduction over super -hydrophobic surface for various flow conditions was researched.
通过水槽和水洞的实验，研究了超疏水性表面在不同流动条件下的减阻特性。
Based on our flow visualizations, a new mechanism of drag reduction is proposed. The device has been refined and net drag reduction has been achieved.
建立在自己流动显示的基础上，提出了新的减阻机理，改进了设计，并获得较好的减阻效果。
In this paper, under the gas-liquid stratified laminar and turbulent flows, and the mixture turbulence flow by aeration in pipe, the laws of drag reduction have been researched.
本文研究了圆管中气液分层层流、分层紊流及掺气混合紊流情况下的阻力减小规律。
The effects of PLMA′s relative molecular mass, content, temperature and flow state on the drag reduction effectiveness and the shear stability were discussed.
考察了其粘均相对分子质量、质量分数、温度及流态对减阻效率、抗剪切稳定性的影响；
The adding of the drag reduction agent can reduce the friction force of the current and increase the flow speed as well as increase the conveying distance.
引入减阻剂后，可降低湍流磨擦阻力，提高流速。增大输送距离和提高管道输送能力。
When the flow rate of the liquid slipping along the solid surface exceeds that of a critical speed, slipping will occur and drag reduction will be realized consequently;
当液体沿固体表面的流速超过临界速度时，出现滑移，这样能实现减阻；
In some cases, multiphase flow patterns can be changed and severe slugging can be suppressed by using drag-reduction technology, which improves operation conditions of offshore transpo…
某些情况下，减阻技术还能够改变多相流的流型、抑制剧烈弹状流，改善油气输送系统的运行工况。
The effects of the tip shape of V-groove on drag reduction and flow field characteristics by numerical analysis;
近年来对于水下条纹沟槽表面减阻的研究多集中在试验方面，理论分析和数值计算进行的却不多。
The effects of the tip shape of V-groove on drag reduction and flow field characteristics by numerical analysis;
近年来对于水下条纹沟槽表面减阻的研究多集中在试验方面，理论分析和数值计算进行的却不多。
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