查询词典 surface drag

Originating the water ascends to drag along to take, porterage etc. activity, its development process has something to do with 蛙泳 with free 泳.Appear in 1794 the relevant human body lie on the back the surface, two arms row the water backward in the side, two legs do the 蹬 of the 蛙泳 clips the operative writing jots down, so have the " versa 蛙泳" or" breast-stroke swimming backstroke" at the beginning it call.The 1902 lead the free the technique of 泳 into the backstroke,1912 the United States athlete 赫 cloth 纳 H.

起源于水上拖带、搬运等活动，其发展过程与蛙泳和自由泳有关。1794年出现有关人体仰卧水面，两臂在体侧向后划水，两腿做蛙泳的蹬夹动作的文字记载，故最初有&反蛙泳&或&蛙式仰泳&之称。1902年将自由泳技术引入仰泳，1912年美国运动员赫布纳

On the fingertip drag drill she drags her fingertips right on the surface of the water, close to the mid-line of her body, which makes her think about getting her elbows up on the recovery, and she's trying to keep her body in alignment so that her hips don't go out of line.

在指尖拉水训练中，她的指尖在水面划过，靠近身体的中线，这使得她高肘移臂。她努力调直身体，使臀部不会与身体脱节。

On the fingertip drag drill she drags her fingertips right on the surface of the water, close to the mid-line of her body, which makes her think about getting her elbows up on the recovery, and she's trying to keep her body in alignment so that her hips don't go out of line.

在指尖拉水训练中，她的指尖在水面划过，靠近身体的中线，这使得她高肘移臂。她努力调直身体，使臀部不会与身体脱节。6、锚钩训练

Experimental study and numerical simulation about turbulent boundary layer drag reduction of riblets surface were carried out for increasing voyage and speed of vehicle.

针对航行器提高航程和航速的需要，开展脊状表面湍流边界层减阻的实验和数值仿真研究。

Numerical simulations of fully developed turbulent flow over triangle,scallop and blade riblets biomimetics non-smooth surface were performed to educe the reason of different drag reduction by different riblets,which can provide guide for design optimization riblets.

分析了三种沟槽非光滑表面的流场特性，对计算域中心Z=3mm平面的速度场和湍流统计量进行了研究，分析了不同沟槽形状对减阻效果的影响，为最佳减阻沟槽设计提供了理论依据。

The experimental velocities cover subsonic,transonic and supersonic flows,and the content includes:(1) flow over flat plate,revolution body and wing with riblets surface at zero angle of attack;(2) the effect of pressure gradient,angle of attack and slide angle;(3) the burst characteristics,characteristics of turbulence,the streak structure in the near wall region and the drag reduction mechanism.

内容涉及沟槽面平板、旋成体、机翼等在压、跨、超音速流动情况下的实验研究成果；压力梯度、攻角、侧滑角等的影响；湍流猝发特性、紊动特性、近壁区带条结构的特征及减阻机理等方面的工作。

When flying the hulls eliminate parasite drag and add their area to the wing surface area.

当飞行船壳消除寄生虫拖动和添加其面积机翼表面积。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐