叶尖

桂花叶尖皱缩病病原的鉴定

Identification of Pathogen of Wrinkling on Sweet Osmanthus Leaf Apex Legionnaires ' disease

叶基部气孔数占全部气孔数的比例最大，叶尖最小，但随着种植密度的增大，气孔在叶片上的分布趋向均匀。

The maximum stomatal density was found in the leaf base , while the minimum in the leaf apex . Stomatal distribution became more symmetrical with the increase of planting densities .

CAD技术在磨叶片叶尖工具中的应用

Application of CAD in Blade Tip Grounding Tool Design

开式轴流风扇叶尖流动的PIV实验研究

PIV investigation of blade tip flow in open axial fan

本文数值求解N&S方程和Euler方程对比分析单转子轴流压气机内部流场、计算较好地预测了压气机的平均流场及叶尖泄漏涡的生成演化过程。

Internal flow in an isolated axial compressor is numerically studied by solving NavierStokes equations and Euler equations in this paper .

蚕豆（Viciafaba）叶尖微核监测技术在开顶式熏气臭氧上的应用

The MCN Technique of Leaf Apex of Vicia faba Applied to Ozone in Appn-to Field Chamber

这里基于CFD数值计算的结果，对5种工程上常用的涡轮叶尖间隙流动损失模型进行了全面的分析比较。

Five turbine tip clearance loss models , widely used in engineering practice , were analyzed and compared comprehensively on the basis of the CFD numerical simulation .

本文利用计算流体软件FLUENT对风力机叶尖加与不加V型平板或S型平板小翼的动力放大特性进行了研究。

By utilizing CFD software Fluent , the paper investigates the power augmentation rules of the wind turbine with and without V type tip vane or S type tip vane .

仿真结果表明，在额定风速以下风力机能够有效地保持最佳叶尖速比运行，所提出的分数阶PIλ控制方案具有更好的控制效果。

The simulation results show that , the wind turbine operates with the best tip ratio speed under rated wind speed . The proposed control method has better control performance .

根据传感器叶尖定时信号同步转换理论分析，光纤光栅解调仪解调出光纤光栅中心波长λB（t）的最大值所对应的时间信号即为所求的叶片端部到达叶尖定时传感器的时间脉冲信号。

According to the synchronized conversion theory of tip timing sensor signal , the time signal corresponding to the maximum of the fiber Bragg grating center wavelength fiber grating is the time impulse signal demanded when blade reaches the tip-timing sensor .

为了分析某发动机高压压气机Ⅳ级工作叶片叶尖掉角故障，采用ANSYS有限元软件对该级叶片进行了相对振动应力及振动特性计算分析。

To analyze blade tip exhaust edge fracture failure in stage ⅳ rotor-blade of an engine HP compressor , relative vibration stress and vibration characteristics are calculated by using the finite element software ANSYS .

使用三维数值模拟软件NUMECA（NumericalMechanicsApplication）对双涵道风扇/增压级带转子叶尖间隙的粘性流场进行了三维定常流动数值模拟，获得了其设计转速下的流场特性。

A three dimension numerical simulation software named NUMECA ( numerical mechanics application ) was used to calculate the tip clearance flow of fan / compressor . The flow field performance under design speed condition was obtained .

实验结果结合三维CFD数值模拟研究了部分管道式轴流风扇系统叶尖涡、尾缘涡特征，及其在室外机内部的流动变化。

With help of experiment and CFD simulations , character of tip vortex and trailing edge vortex of partly-ducted axial flow fan is studied , with flow change in outdoor units also analyzed . 2 .

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。

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 .

此方法的损失计算中叶型损失采用S1流面数值模拟方法得到，叶栅端部区域附近的二次流损失以及动叶叶尖漏气损失采用经验数据的方法估算。

Profile loss is calculated by numerical method on several S1 flow surfaces . Secondary loss and tip-leadage loss are empirically estimated with pitch-wide average losses along the cascade blades .

采用固定频率脉冲填充方法，并基于CPLD、FIFO、EPP的融合技术，实现10ns的叶尖定时分辩力。

The fixed frequency pulse filling method , and the combination of CPLD , FIFO and EPP are adopted to realize 10 ns tip-timing accuracy .

本方法是基于对FW-H方程的准确求解，并限制螺旋桨叶尖相对速度为亚音速。

The blade tip speed is limited to subsonic . The formulation is based on the FW-H equation .

与背风面相比，由于受到盐雾影响，迎风面叶片的叶缘或/和叶尖出现枯焦，叶绿素、含水量下降，积累更多Na和更少的Ca、Mg，而K差别不大。

In contrast with leeward , windward leaves faded at the top end and around , following with contents of chlorophyll and water descended , while accumulated more sodium and less calcium and magnesium but potassium contents changed little , due to the spoondrift effect .

最后应用ANSYS有限元软件利用循环对称的方法分析了某型发动机高压涡轮在温度场及离心力作用下的叶尖间隙在发动机工作过程中变化情况，并分析了计算中的接触热阻的处理问题。

Finally , ANSYS software is used to analyzed the variation of tip clearance with the method of cyclic symmetry analysis when engine works under the conditions of temperature and rotational speed , AM using a new method to deal with thermal contact resistance in the calculation .

为表明方法的有效性，分别以UH－1和H－34两种直升机旋翼为算例，计算了不同前飞状态的自由尾迹形状，展示出小速度时尾迹畸变和叶尖涡卷绕的重要特征。

As examples , the calculations on free wake of UH 1 and H 34 rotors are performed for different advance ratios , and the feature of highly distorted free wake shapes and the strong tendency toward a rapid wake roll up for low speed case are exhibited .

介绍了利用激光多普勒测速仪（LDA）和激光片光流场显示技术在一轴流风扇转子叶尖附近流场测量得到的结果。

An experimental investigation associated with the basic fluid mechanics in an axial flow fan is described in this paper . The flow field in the tip region has been studied by laser Doppler anemometer ( LDA ) and flow visualization technique .

采用优化Glauert方法，对上述3种叶片的推力系数、扭矩系数、功率系数与叶尖速比之间的关系进行了计算。

The relationships among thrust coefficient , torque coefficient , power coefficient and blade top speed ratio of the blade s mentioned above are calculated by optimum Glauert method .

利用自行开发的叶轮机三维数值模拟软件对高负荷跨音压气机ATS-2转子进行了带叶尖间隙的三维流动数值模拟，并与实验的结果进行了比较。

A 3D numerical simulation software was developed to calculate the tip-clearance flow of ATS-2 , a high-loading transonic compressor , and the results were compared with the experiments .

叶尖定时传感器采用单根光纤发射、多光纤接收的Y型结构，并用高性能专用集成芯片完成弱光信号的放大检测，使传感器信噪比大于500，信号带宽大于50MHz。

With the Y type structure of single fiber transmitting and fiber bundles receiving , the tip-timing sensor can realize detecting faint light signals by using high performance integrated chip . This design makes the SNR bigger than 500 and the bandwidth bigger than 50 MHz .

叶尖间隙对轴流压缩系统稳定性的影响

The Effects of Tip Clearance on Stability of Axial Compression System

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

A model for estimating tip clearances in gas turbine engine transients

弯掠动叶旋转失速工况下气动声学的实验分析与计算弯掠动叶叶尖径向间隙对气动&声学性能的影响

Influence of tip clearance on AERODYNAMIC-AEROACOUSTIC performance of Skewed-Swept rotating blades

风力发电系统中一种最佳叶尖速比控制策略的研究

Research on Optimal Tip-Speed Ratio Control Strategy in Wind Generation System

拿第二张叶子，把中间的叶尖折下。

Take a second leaf and fold the center point down .

风轮特性测试的叶尖速调节系统

A Blade Speed Control System Used for Wind Turbine Features Test