But once the vessel is in motion the additional drag results in only a 3-5% reduction in speed, says Mr Ray.
但是雷说，船一旦开动起来，其附加阻力造成的减速仅在3- 5%。
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 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 proposed drag reduction mechanism and drag reduction method are valuable both theoretically and in engineering to realize the low drag pipeline transport of highly viscous fluid.
所提出的减阻机理及工程减阻方法对实现高粘度流体的低阻力管道输送具有重要的理论指导意义和工程应用价值。
The new type of rheology controller has its application potential in drilling, Enhanced Oil Recovery (EOR) and liquid transportation drag reduction.
这种新型流变控制剂在钻井、提高采收率以及流体输送减阻中具有潜在应用价值。
It is employed the concept of multi-scale coherent structures to study the mechanism of riblet surface drag reduction in turbulent boundary layer.
将湍流多尺度相干结构的概念引入沟槽壁面湍流边界层减阻机理的研究。
This paper gives a brief introduction of the drag reduction characteristics of the dilute solution of high polymer in pipelines, the possibility of its application to oil pipelines.
本文简要地论述了高分子聚合物稀溶液管道减阻的特点，并探讨了在输油管道上应用的可能性与存在问题。
By determining drag reduction efficiency of polymer in a simulative loop evaluation apparatus, effects of DDS as external electron donor on number and distribution of active centers were confirmed.
结合室内模拟环道评价装置，测定聚合物的减阻性能，确定DDS作为外给电子体对聚合活性中心数量和分布的调变作用。
The researches of drag reduction by grooved surface in water are mostly concentrated in experimentations recently, and researches in theory and numerical calculation are lacked.
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。
Working area for drag reduction agents (dra) is in turbulence area, and it can reduce resistance as well as increase transportation effectively.
减阻剂的作用区域在流体的湍流区，它能有效的降低流体阻力增加流量。
It is found that the variation of planforms and geometrical parameters can effect only the drag reduction but little to the low lift in low angle of attack condition.
发现单纯改变涡襟翼的形式和参数能提高减阻效果，但不能改变小迎角下升力过小的现象。
Finally, some research direction of plasma drag reduction technology in China are suggested.
最后针对我国的减阻研究情况，提出了等离子体减阻技术的研究方向。
This paper studies on the feasibility of applying the additive drag-reduction technology to practical engineering project in water system of HVAC.
本文将从应用基础的角度研究添加剂减阻技术在暖通空调水系统中实际工程应用的可行性。
Internal coating used in high pressure, large diameter and long distance gas pipeline has two main functions, one of them is anti corrosion and the other is drag reduction.
高压、大口径、长输天然气管道采用内涂层主要具有两大功能，一是防腐蚀，二是减阻。
An idea of drag reduction by pre-stirring on pipeline transportation of highly loaded coal-water slurry is firstly proposed in this paper.
木文首次提出了高浓度水煤浆管道输送搅拌减阻的思想。
More mature drag reduction tools have been developed abroad, but the domestic drag reduction tool research and development is still in its infancy.
国外已有较为成熟的减阻工具，而国内的减阻工具研发工作尚处于起步阶段。
This is the new explanation to mechanism of drag-reduction raised in this paper.
这就是本文提出的关于减阻机理新的解释。
Finally, in addition to developing new surfactant additives, the trends of surfactant drag reduction research in the future are discussed.
最后，在提出开发新的表面活性剂添加剂的同时，对进行表面活性剂减阻的研究趋势进行了展望。
The authors also tested the flat plates with and without the Biblets drag Reduction Film in wind tunnel and compared their fluid drags.
作者在风洞中做了贴及不贴微肋薄膜平板试验对比。
It is an effective way to increase transmission capacity of pipelines by adding drag reduction agent in oil of pipeline.
在管输油品中加入减阻剂是提高管线输送能力的有效方法。
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。
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。
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