This, the researchers believe, is caused by the surface of the water smoothing out a vortex of air coming off the flying fish and reducing drag.
研究者相信，这源于水面平滑了飞鱼迎面的风涡，降低了阻力。
The surface of propeller and its trailing vortex is divided into a number of small hyperboloidal quadrilateral panels with constant source sink and doublet distributions.
螺旋桨表面和它的尾涡面离散为四边形双曲面元，每个面元上布置等强度偶极子和源汇分布。
The results show that the interaction between a viscous vortex ring and a free surface is different from the inviscid one.
结果表明：由于粘性的存在，使得涡环与自由表面的相互作用与无粘情形相比有许多不同。
Moving path lines, tangential and axial average velocities of particles at the vortex surface are obtained by the photography method.
通过摄像法得出了旋涡表面流体质点的运动轨迹、切向和轴向时均速度。
The leading edge vortex breakdown can be delayed using supplements to change the flow field over upper surface of the wing.
利用附加的小辅助件，改变翼面上方的流场，使机翼前缘肌体涡推迟破裂。
There are bundles of meridians breaking through the surface at the center of this vortex.
在地磁涡流中心处有成束的地磁线穿过表面。
Lifting surface method and non-linear vortex lattice method were used for the calculation of propeller and rudder with additional thrust fins respectively.
对螺旋桨与舵附推力鳍分别采用升力面法和非线性涡格法计算。
The nonlinear free surface boundary condition is considered and the hydrodynamics forces of the hydrofoil near the free surface are calculated by the submerged vortex lattice method.
考虑到非线性的自由液面边界条件，用下潜涡环栅格法求解水翼绕流问题。
The coordinates of grids on the wing surface and dipole strength on the trailing vortex surface were changed with respect to time-stepping.
翼表面网格坐标和尾涡面上的偶极强度随时间步进变化。
The improved vortex lattice method is used to predict the ground effect on wake roll-up behind a lifting surface.
用该方法研究了近地升力面尾涡卷起的地面效应。
When waves act on a vertical cylinder, there are in-line and lift forces. They are caused by the viscous effect, which induces the surface frictional force and flow separation and vortex shedding.
通常将垂直柱体在波浪场中的受力分为正向力(顺流力)与升力，它们是由干粘性流绕钝体产生的摩擦阻力和由于水流绕柱分离产生涡漩而形成柱表面压力分布的不均匀变化而造成的。
This gravity-defying robot can climb walls and even cling to the ceiling, using a vortex vacuum to hug to the surface.
这种挑战重力的机器人利用一台紧抱表面的涡流真空泵能够爬上墙壁，甚至紧贴着天花板。
Based on the vortex theory, lifting surface method is used to establish wind turbine performance prediction model with rigid cylinder wake model, prescribed wake model and free-wake method.
采用基于涡系理论的模型建立刚性圆柱尾迹和预定尾迹模型的升力面法预测程序，对无偏航情况的风力机性能进行了预测。
The experiment of water model has been conducted to study the effect of pouring technical parameters on the surface flow and vortex in the mold of continuous casting of slab.
利用水模拟实验研究连铸浇注操作工艺(参数)对板坯结晶器内液面涡流的影响规律。
Tests and analyses have shown that the shock on the leeside surface has a large influence to the asymmetric vortex pattern.
实验和分析表明，卵柱体背风面上的激波对不对称的旋涡谱有很大的影响。
It has been found that at the jet flow cross-section near the impingement surface accompanied by the appearance of two counter-rotating vortex pairs there emerge two eccentric peak values.
结果发现在冲击面附近的射流横截面上，伴随着两个反向旋转涡对的出现，形成了主流速度的两个偏心峰值。
The ejection from the half slot only blows away the vortex on the slot surface, and has little effect on the flow field near the trailing edge.
半开缝时，喷气的引入仅吹除了附着在开缝处的漩涡，对于尾缘处流场影响不大。
After the vortex distribution is solved according to the boundary condition of no-flow-penetrating through the blade surface, the velocity reduced by the propeller can be calculated.
根据桨叶表面流动不穿透条件解出升力面奇点后，然后再求它们对流场的扰动。
The desingularization smoothing parameter is introduced in calculating the induced velocity on trailing vortex surface.
在诱导速度计算中引入了非奇异光滑参数。
The invention discloses a reinforced heat transfer element of a truncated cylindrical surface wing type vortex generator, belonging to the field of heat transfer parts of heat exchanger.
本发明公开了属于换热器传热零部件领域的一种斜截柱面翼式涡发生器强化传热元件。
The invention discloses a reinforced heat transfer element of a truncated cylindrical surface wing type vortex generator, belonging to the field of heat transfer parts of heat exchanger.
本发明公开了属于换热器传热零部件领域的一种斜截柱面翼式涡发生器强化传热元件。
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