The results showed that, the tip vortex at the blade's leading edge near the suction surface tip region is generated by the rolling up effects between the main flow fluid along the meridian surface and the outer fluid of the blade's outer region.

According to distribution of pressure of blade surface at different time of outdoor units, it is shown that interaction between tip vortex and bellmouth is the major factor of unsteady fluctuation of blade surface and has large effect on discrete frequency noise of outdoor units.

室外机不同时刻叶片表面压力分布表明，叶尖涡与导风罩干涉是室外机中叶片表面非定常力脉动的主要原因，影响室外机离散频率噪声。

In partly-ducted axial flow fan system with bellmouth, blade tip vortex formed at blade leading edge is generated by pressure gradient between suction side and pressure side, it develops downstream and into flow passages as blades rotate.

含导风罩的部分管道式轴流风扇系统，在叶轮前缘由于吸力面和压力面压差产生叶尖涡，随叶轮旋转往下游和流道内部发展。

Then, complex three-dimensional turbulent flow field inside flow passage of partly-ducted axial flow fan are analyzed, characteristics of tip vortex with its formation, development, stretched and broken down by the interaction with bellmouth are discussed.

分析了部分管道式轴流风扇内部复杂三维湍流流场，特别是叶顶区域叶尖涡的形成、发展，及其与导风罩干涉后的拉伸和破裂现象。

The measurements of hovering blade tip vortex and rotor wake were conducted to investigate the blade tip vortex formation and evolution, and its relationship with the rotor test states.

为了详细研究悬停旋翼桨尖涡的形成与发展过程，以及旋翼状态参数与桨尖涡及其尾迹的关系，开展了桨尖涡及其尾迹的测量和研究。

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.

本文利用对开式前缘弯掠轴流风扇进行PIV实验，捕捉到了开式轴流风扇的叶尖涡。

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；

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。

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。

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。

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。

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。

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

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

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

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。

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。

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。

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。

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。

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。