查询词典 tip speed

Generally,C p curve can be regarded as a nonlinear function of pitch angle and tip speed.

通常情况下，功率曲线与桨距角和叶尖速比有关，可以看成是它们的非线性函数，一般由气动性能计算得到。

The agitation power consumptions in boiling systems decrease uniformly with the increase of agitation speed, whereas the relative power demand (RPD-the ratio of agitation power input of HEDT for gassed system to that for ungassed system and under the same agitation speed) can maintain at a high level for high gas loadings even when the impeller is operating with a high impeller tip speed. The gas hold-up in the boiling system is much lower than that in the cold gassed system, and the gas hold-up in boiling system increases at first and then decreases with the increase of the agitation power consumption per liquid mass P(subscript m. It implies that the boiling three-phase system has a maximum gas hold-up point. The changes of nucleation site of vapour bubble and the character of suspension of the solid particles with the rotational speed of the impeller are responsible for those behaviors mentioned.

在沸腾条件下，搅拌功率消耗随着搅拌转速的增加有所下降，但HEDT桨具有较高的载气能力，即使在高叶端线速度下，相对功率消耗仍能保持在较高的水平；沸腾体系的气含率随单位质量流体输入功率的增加表现出先增后减的规律，即存在气含率的极大值，蒸汽成核位置和固体颗粒悬浮特性随搅拌功率增加而改变是造成上述行为的主要原因；沸腾体系中的气含率远远低于常温通空气体系。

The objectives of this paper were to investigate the simulation and design of continuous multiple-station rolling forming process for a U-Section Steel Bar by CAE software-DEFORMTM Due to the limitation of elements number using a short strip 120mm went through all the stations to simulate the real continuous rolling forming on factory The roller gap was fixed as 0 30mm roll speed was 20 rad/sec and progressive angles were all equal for each rolling process which were the formed angle divided by by the number of station Three rolling processes were selected with 6 9 and 12 stations respectively During simulation processes two cases occurred Case A the strip was through a single station Case B the strip across two stations Because the strip laterals side was stretched and twisted during the process The model of case B closer to the practical process than case A and the calculated stress and strain on the tip of U section for case A were lower than these for case B by up to 15% From the result of case B for each process the stress for 12-station process was smallest 9-station process second and 6-station process next Because less-station can save larger cost and forming time but the bigger stress and strain for 6-station caused wrinkles on lateral sides not found on 9-station and 12-station Therefore 9-station process was a more suitable design than 12-station process smaller stretched and twisted and stress The progressive angles for 12-station was 7 5?

本文主要是以DEFORMTM有限元素软体模拟U型钢片连续道次成型与单一道次成型以确认单一道次模拟的是否可取代连续道次模拟之研究。因DEFORMTM 软体对於网格元素上的限制故使用较短素材120mm通过所有的成型站以模拟工厂实际连续成形方法。辊轮间隙固定为0 3mm；辊轮转速为20 rad/sec；弯曲角度的方法为将成型角度平均除以成型站数。有三种辊轮成型方式被选择分别为6站，9站，与12站。在模拟的过程中有两种现象会产生 Case A，素材通过单一成型站。Case B，素材会通过两个成型站。因为在模拟过程中素材的两端会有拉应力与扭力。Case B的模拟比Case A像实际的制程，并计算应力与应变在U型断面的Tip部中可发现Case A比Case B低约15%。从Case B的每站的结果可以得知，12站的成型应力最小，9站次之，6站最后。

The tip speed limit is for controlling the tip vortex cavitation energy, which is a function of tip speed to the sixth power.

尖端的车速限制是为了控制尖端涡穴蚀的能源，这是一个功能提示的速度向第六权力。

With the inlet diameter selected, the shaft speed is selected to limit the inducer tip speed to approximately 550 ft/sec.

与进气道直径选定，轴的速度是选定的限制诱导提示的速度大约550英尺/秒。

Titanium, which has a higher strength- to-weight ratio than the high-strength nickel-base alloys, was required for the high tip speed.

钛，它具有较高的强度-重量比，比的高强度镍基合金，需要高尖端的速度。

The tip speed structural limit is based on the centrifugal pull that can be carried at the base of the blade airfoil for the selected material and is generally expressed as allowable annulus area x N2 versus temperature.

尖端的速度结构的限制是基于离心拉，可以进行在该基地的叶片翼型为选定的材料，并普遍表示允许环区x氮气随温度的。

Blade tip diameter is selected to optimize the U/C for efficiency within the blade height-to- diameter performance limits and within the tip speed structural limits.

叶尖直径是选定的优化美国/ C的效率与叶片高度到直径的性能界限和尖端的速度结构的限制。

The double entry back-to-back pump was selected for the HPOTP in the SSME in order to increase the shaft speed by 2 and stay within the tip speed limit, while maintaining the required total inlet flow area.

双入境背对背泵被选定为hpotp ，在ssme ，以增加轴的速度 2和留在尖端的车速限制，同时保持所需总入口流量面积。

Because shockwaves might disturb regular airflow at fans with a high tip-speed (axial speed at the tip of a fan blade), fans are developed to keep to tip-speed as low as possible, not more than two or three times the local axial velocity.

因为冲击波可能会以高度的扇叶速扰乱来自风扇的常规气流，风扇被改进成保持扇叶速尽可能的低，至多2或3倍于开始的轴向速度。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失