涡

According to the understanding of the flow characteristics, a mechanism of formation of vortex streets has been proposed to be the absolute instability of the wake, and several methods of flow control have been developed and shown successful.

根据表面流动及尾流特性的研究结果，从流动稳定性的角度提出了尾流中涡街产生的机理，在于尾流中存在着绝对不稳定的区域。基于对流动特性的理解，从改变流动稳定性的角度，寻求各种流动控制方法。试验结果表明这些方法是成功的。

The absolute/convective instability of incompressible swirling flows and the temporalinstability of compressible swirling flows have been fully explored, whereas the absolute/convectiveinstability of compressible swirling fl.

从N－S方程出发，通过正则模方法，研究了超声速尾涡的绝对／对流不稳定性性质。

The Corinthian capital is more ornate, with carved acanthus leaves and scrolls.

科林斯柱式的柱头装饰更加华丽，刻有爵床叶饰和涡卷。

The Corinthian capital is more ornate, with carve d acanthus leaves and scrolls.

科林斯柱式的柱头装饰更加华丽，刻有爵床叶饰和涡卷。

In the upper troposphere the isentropic potential vorticity advection contributed to the cyclogenesis and its effect was limited.

另外，对流层高层位涡平流也是气旋发展的一个强迫因素，但其影响较小。

A distribution law of aerodynamic force and moment is further developed from the genera formulas cooperating with the Navier-Stokes equation.

利用 Navier-Stokes 方程求出动力学涡量的变化率，进一步把力和力矩表示成一些显式积分。

The effects of magnitude and distribution of the electromagnetic force on the flow around the aerofoil were investigated. The results show that the electromagnetic force with large magnitude and concentrated distribution on the surface of aerofoil is advantageous to eliminate vortex structures and boundary separation, and therefore to increase the lift-drag ratio.

同时对不同电磁力大小和分布影响翼型表面边界层流动的规律进行了探讨，其结果表明，较大的电磁力和更加集中于翼型表面的电磁力分布可以很好地消除涡结构，抑制边界层分离进而达到提高升阻比的效果。

In the experiment, an accelerater is used as sensor to pick up the vibration signal of aerofoil, loudspeakers are used as vibration control sources, the aerodynamic load on the aerofoil is produced by the coupling of sound and vortex.

实验中采用加速度计作为传感器，拾取机翼振动的信号，用扬声器作为振动控制源，通过声—涡的耦合来产生作用在机翼上的气动载荷。

WIG craft ; wingtip vortex ; downwash angle ; induced drag ; numerical simulation ; ideal vortex model

地效飞行器；翼尖涡；下洗角；诱导阻力；数值模拟；理想涡模型

The curves of aerodynamic characteristics are provided for the wings in ground effect with different aspect ratios and endplate, the effects of aspect ratio and endplate on the position of wingtip vortex core and downwash angle are revealed.

计算结果给出不同展弦比和带端板地效翼的气动特性曲线，揭示展弦比和端板对翼尖涡涡核位置和下洗角的影响规律。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐