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

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。

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。

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。

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；

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；

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；

The simulation jet tip velocity with reverse initiation is 8.78 km/ s, while with normal initiation it is only 4.86 km/ s.

计算的逆向起爆形成射流头部速度为8.78km/s，而正向起爆形成的射流头部速度为4.86km/s。

With increasing in the environment density, the spray penetration and spray tip velocity decrease more rapidly, and the spray angle becomes larger.

环境密度增大时，喷雾破碎期缩短，贯穿距减小、锥角增大；

It is a very important approach to increase the tip velocity of rotor for the high pressure ratio.

提高单级压比的重要途径之一，就是提高动叶的叶尖速度，这同时就会造成叶尖的超音速。

Tip clearance of the turbine plays an important role on the aeroengine performance. Dimension conversion from hot state to cold state of the turbine components is an important content of tip clearance research.

涡轮叶尖间隙影响着发动机的性能，涡轮典型部件的冷热态尺寸换算是间隙设计的重要内容。

The results show that the parameters chosen are reasonable and the tip vanes on wind turbine blade improve the start performance and obviously enlarge the working range of the unit.

试验表明：机组的总体参数选择合理，叶片上的小翼对改善机组低风速下的起动性能和加大全机工作范围有明显好处。

A commercial N-S solver has been employed for simulation and investigation of the unsteady flow field inside the tip clearance of a turbine rotor.

商用N S求解器已经被用于透平动叶顶部空隙的非定常流场的模拟和研究。

Counter rotating turbine Effects of endwall relative motion on tip clearance flow in turbine rotors

正反转双转子涡轮机机匣相对转动对涡轮叶顶间隙流动的影响

A model for estimating tip clearances in gas turbine engine transients

燃气轮机过渡过程中叶尖间隙估算及间隙变化对加速过程的影响

Contrasts and analyses of flow fields in turbine stage with different slotting types are made to investigate the impact of slot at rotor tip on the turbine efficiency and secondary flow loss.

本文对几种形式开槽的涡轮级流场进行了对比分析，分析了动叶顶部开槽对涡轮级效率和二次流损失的影响。