查询词典 prolate cycloid

In experimental research, structures of the skin friction lines appearing on a prolate spheroid in laminar and turbulent flows were investigated and compared by using an improved oil-flow visualisation technique.

在实验研究中，用改进的油流显示法研究和对比了层流和湍流状态下绕椭球流动的表面摩擦力线结构。

Thus the distribution of surface field and near field can be obtained..Numerical results for sphere and prolate spheroid are in excellent agreement with thos...

本文给出的球体及长椭球体的数值计算结果表明，这种方法可获得与本征函数级数解相当吻合的结果，优于OSRC方法的结果，说明这种方法可能成为一种对现有解析或数值方法的有效替代方法。

It is found that span-wise TKEDC is nearly 1/3 for a fully developed turbulent flow, based on processing the experimental data of flat-plate boundary layer and the flow past prolate a spheroid according to the new idea.

使用新的思想处理平板边界层及椭球绕流的实验数据后发现，在充分发展的湍流区，流动展向的湍动能分配系数接近1/3。

The general equation of heat transfer in the stationary state is solved for four special forms of bodies, namely, plane, circular cylinder, sphere, and prolate spheroid.

接着详细研究了在稳定的情形下普遍传热方程在四种特殊形状的物体中的解，这四种特殊形状是，平面、圆柱体、球体、和长椭球。

Turbulent flow about a 4:1 prolate spheroid was measured on cross sections using the PIV technique for validating turbulence models.

为了检验湍流模型，用PIV方法测量了绕4：1椭球湍流流场的几个剖面。

Structures of the skin friction lines appearing on a prolate spheroid in l aminar and turbulent flows were investigated and compared by using an improved o il-flow visualization technique.

用改进的油流显示法研究和对比了层流和湍流状态下绕椭球流动的表面摩擦力线结构。实验中观察到，椭球表面摩擦力线在层流和湍流状态下具有不同的拓扑结构。

The effects of small grains set on the surface of prolate spheroid on SFL were also observed and analysed. In laminar flow, Re=1. 4×10〓, the shape of separation line is affected prominently by the nearby grains.

层流状态下，雷诺数为1.4×10〓时，分离线附近的颗粒状突起会显著影响分离线的形状，当雷诺数减为0.9×10〓时，颗粒对分离线只有微弱的影响。

Based on the reciprocity theorem, the analytic solutions of electric field induced by time-varying magnetic field were obtained when the boundary of volume conductor is infinity, semi-infinity and prolate spheroid respectively.

根据互易定律，给出了容积导体为无限大、半无限大及边界为长球面三种情况下，时变磁场产生的感应电场空间分布的解析表达式，它是进行磁刺激理论及试验研究的基础。

The effect of Reynolds number on rudder hydrodynamic performance is also analyzed. Up to the stall angle the computed lift and drag agree well with measurements and other author's calculations, whereas stall angle, lift and drag beyond the stall angle are slightly under-predicted. The solver is used to investigate laminar and turbulent separated flows around a 6: 1 prolate spheroid at high incidence angles and their effects on hydrodynamic forces. The second separation flows are successfully identified in both laminar and turbulent flow simulations.

应用所开发的求解器，以6：1长椭球体为算例计算了回转体在大攻角下定常斜航运动时的三维粘性流场及水动力，对层流流动和湍流流动分别进行了计算，分析了层流与湍流分离流动和涡旋产生的特点及其对水动力的影响；计算结果与他人的试验和计算数据比较，吻合程度良好，表明应用本求解器能够正确模拟这种以层流／湍流分离流为主的复杂粘性流动，得到相当精确的水动力，检验和验证了该求解器精确模拟回转体在大攻角下的粘性分离流动和计算水动力的能力。

The solver is used to investigate laminar and turbulent separated flows around a 6:1 prolate spheroid at high incidence angles and their effects on hydrodynamic forces. The second separation flows are successfully identified in both laminar and turbulent flow simulations. The computations are shown to agree well with available experimental and numerical data and the physics of 3D large-scale flow separations and vortex shedding are confirmed.

应用所开发的求解器，以6：1长椭球体为算例计算了回转体在大攻角下定常斜航运动时的三维粘性流场及水动力，对层流流动和湍流流动分别进行了计算，分析了层流与湍流分离流动和涡旋产生的特点及其对水动力的影响；计算结果与他人的试验和计算数据比较，吻合程度良好，表明应用本求解器能够正确模拟这种以层流/湍流分离流为主的复杂粘性流动，得到相当精确的水动力，检验和验证了该求解器精确模拟回转体在大攻角下的粘性分离流动和计算水动力的能力。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。