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

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。

The flow near the tip region and heat transfer characteristics of the blade was analyzed. Numerical results showed that the blade can be well protected by the air-cooled configurations.

对具有复杂冷却结构的原型空气冷却动叶进行了整体气热耦合计算，分析了叶片叶顶附近的流动和叶片的换热特性，表明原型气冷结构基本能够为该叶片提供较好的保护。

Effects of squealer tips on blade aerodynamic performances and tip heat transfer in a gas turbine were investigated.

应用数值方法研究了燃气透平动叶顶部凹槽对动叶气动性能及叶顶传热的影响。

Mechanical model for atomic force microscopy tip sliding on the surface of sample

原子力显微镜针尖在试样表面滑动的力学模型

The aim of this dissertation is to make theoretical analysis and experimental research on the field emission current generated between tip and sample surface, analyzing the effect of fabrication parameters on the results of weak current during the process of dots and lines fabrication.

本课题对AFM电场诱导氧化加工中探针与样品之间产生的场发射电流进行了理论分析和实验研究，通过实验分析了加工参数对氧化点、氧化线加工过程中检测出的微弱电流的影响。