涡

The Large eddy Simulation is used to simulate the flow field and cavitation on an Orifice Energy dissipator. The characteristics of cavitation was analyzed. The calculated and the measured pressure distribution and the cavitation were in agreement.

采用大涡模拟方法对消能孔板流场及空化现象进行了数值模拟，研究分析了消能孔板空化特性，计算所得的压力分布及空化特性与减压模型实验结果进行了比较，二者符合良好。

Orifice energy dissipator ; Large Eddy Simulation; cavitation

孔板；大涡模拟；空化特性；压力分布

Validation of the method is presented by calculating the Taylor's vortex array and a double layer flow problem.

并以Taylor涡和流体的初始流场为双层速度分布的问题为例，得到了很好的结果。

In the vortex-ring gait, lift is produced only during the downstroke, providing positive upward force and forward thrust.

在涡环的步态，升降机，是生产只有在downstroke ，提供积极向上的力量和前进推力。

As the insect wing continues on its downstroke, a leading edge vortex develops along the top of the wing, significantly contributing to lift.

由于昆虫翅膀继续就其downstroke ，前缘涡的发展沿上方的机翼，显着贡献的升降机。

The medium duty trimmers cut through aluminum, cardboard, drafting film, illustration board, laminating film, leather, mat board, newsprint, paper, photo film, polyester film, tissue, tracing paper, vellum, and vinyl.

中期削减关税微调器通过铝，纸板，起草电影，说明板，复合薄膜，皮革，垫子板，新闻纸，纸张，胶卷，聚酯薄膜，组织，描图纸，涡卷形，以及乙烯。

Per clamp or 100 sheets of drafting vellum or tracing paper.

每钳或100张起草涡卷形或描图纸。

The control effect of electromagnetic force on cylinder wake, lift force and drag force, which was caused by alternating current, is related to its frequency.

而交流电所产生的电磁力对于绕流涡街、升力、阻力的控制作用，则与所使用的频率有关。

It is wonderful with what elaborateness this simple fact is advertised ——this piscine murder will out —— and from my distant perch I distinguish the circling undulations when they are half a dozen rods in diameter.

真是神奇，这简简单单的一件事，却可以这么精巧地显现，——这水族界的谋杀案会暴露出来——我站在远远的高处，看到了那水的扩大的圆涡，它们的直径有五六杆长。

The general forms of the conservation of momentum, t emperature and potential vorticity of coastal ocean are obtained in the xz pla ne for the nonlinear ocean circulation of Boussinesq fluid, and a elliptic type partial differential equations of second order are derived. Solution of the part ial differential equations are obtained under the conditions that the fluid move s along the topography.

在考虑了陆架地形后，在垂直海岸的xz剖面上，对Boussinesq流体的非线性海洋运动方程求得了总动量守恒、温度守恒和位势涡度守恒的普适形式，进而得到流函数所满足的椭圆型二阶偏微分方程，在给定流体沿地形运动的条件下，算出问题的解。

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