This paper studied the velocity field of a forward swept axial-flow fan with no casing configuration by means of PIV technology, and a tip vortex phenomenon is observed.

The numerical results indicate that the process of the tip vortex formation is delayed with the decreasing of the tip clearance. Its strength weakens rapidly.

结果表明，叶顶间隙的减小使间隙涡产生过程延缓，强度的衰减速度增大，作用范围减小；

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An analytical method for predicting rotor vortex wake in low speed and hovering flight is described to investigate the motion of the helical tip vortex.

以重点考察旋翼尖涡的运动为目标来构想一种悬停和前飞旋翼涡尾流的理论计算方法。

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An investigation made on the rotor blade tip vortex through use of a Three Dimensional Laser Doppler Velocimetry ( 3D LDV) is described.

利用三维多谱勒激光测速仪，对悬停状态下模型旋翼桨叶附近的流场进行了实验测量。

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When axial flow fan is included in outdoor units, blade tip vortex further develops mid span at meridional plane.

当轴流风扇置于室外机内部时，叶尖涡在子午面上的轨迹愈发向中部叶高方向发展。

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The analytical method for predicting the hovering rotor wake is described to investigate the motion of the helical tip vortex.

用文中描述的尾流分析方法研究了螺旋尖涡的运动。

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Tip vortex goes downstream outward along the span direction, and the induced drag of the wing decreases.

翼尖涡沿着展向方向向外移动，机翼诱导阻力减小。

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3D LDV measurements of rotor blade tip vortex in hover

利用三维激光测速方法研究悬停状态下的桨尖涡

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Investigation of Tip Vortex in Compressor at Near Stall Condition

近失速状态下压气机转子叶尖旋涡流动研究

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Research on rotor tip vortex model and the method for determining its parameter

旋翼桨尖涡模型及其参数确定方法研究

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The Rankine vortex model is traditionally used for modelling tip vortex.

Rankine圆旋涡模型传统地被用来模化梢涡。

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Experimental results indicate that the variation of ambient pressure not only significantly affects the spray tip penetration and the velocity characteristics of spray field, but also affects the droplet size obviously.

结果表明：环境压力的变化不仅可以明显改变喷雾体积大小和喷雾场的速度特性，同时对粒径特征也有显著影响。

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Result indicates that short-fiber can reduce energy release rate in crack tip, reduce the velocity of the crack growth, improve the stability.

结果表明：层间短纤维能够减小分层尖端的能量释放率，有效的减小裂纹的开裂速率，提高开裂稳定性。

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Closing to the impeller tip, the radial velocity is higher than other parts.

在桨叶附近，径向流动速度高。

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As the engine noise is caused largely due to the fan, and fan noise is proportional to the 4th power of the blade tip tangential velocity.

发动机噪音很大部分是由于风扇造成的，而风扇的噪声又与叶尖切线速度的4次方成正比。

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The experiment results show that the influence of tip linear velocity, working density, repeated level and their reciprocities on the cutter's working quality is remarkable.

试验结果表明，甩刀末端线速度、甩刀工作密度、甩刀重复度及其交互作用对切碎机工作质量影响显著。

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The mathematical models related tip linear velocity, working density, repeated level of chopper knife to straw chopped rate established.

并且建立了甩刀末端线速度、甩刀工作密度、甩刀重复度和切碎率的回归数学模型。

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Hence, jet tip velocity produced by direct annular initiation is higher than that of plane initiation, and plane initiation higher than point initiation. It is also concluded that the jet tip velocity of plane and annular initiation increases as the initiation radius increases.

环形起爆形成的射流头部速度高于面起爆的，面起爆高于点起爆的，并且随着起爆直径的增大，面起爆与环形起爆所形成的射流头部速度逐渐增大。

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The amplitude of the fluctuation a has an important effect on interface morphology, when appropriate value is assigned to a, noise can enhance the emergence of side-branches, and form cellular dendrites, the tip velocity must be influenced at the same time;

热扰动幅值α对界面形态也有重要影响，当α取值适当时，便引发侧向分支，形成胞状枝晶；

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The anisotropy is smaller, smaller the tip velocity is, the side-branches are prone to grow, and form cellular dendrites;

各向异性系数γ越小，尖端生长速度越小，越易于侧向分支的生长，形成胞状枝晶；

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The results indicate that, with increase in undercooling, a small nuclei will grow developed dendritic, the tip velocity at steady state is become faster;

结果表明，随着过冷度值的增加，晶核由一圆核逐渐发展为发达的枝晶，相应的枝晶稳态尖端速度明显加快；

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