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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。

By analyzing phases velocity profiles and resistance lawv resulted from gas slug in the pipe center,the condition that the secondary flow occurs,phases velocity profiles,formula of drag reduction and a curve of drag reduction have been obtained.

以流体力学基本方程为基础，通过对气体在管道中心形成段塞流的相速度分布和阻力规律分析，得到了二次流发生的条件、各相流体速度分布、减阻率关系式以及减阻率曲线。

Inadvertently, I am in the room watching "Three Kingdoms", you rub it out again and again wiping the desktop, drag the floor again and again drag, and does not Xianlei, approximate overnice.

无意间，我在房间内看《三国演义》时，你却在外面把桌面擦了又擦，把地板拖了又拖，一点也不嫌累，近似洁癖。

Ice/ridge geometric parameters is established, and from computational analysis it is found that the unmonotonous variations of drag coefficient with ice concentration that frequently observed in sea ice field investigation mostly result from the influence of form drag from ice edge.

通过将原型条件下的冰-水总拖曳力考虑成表面摩拖曳力、冰侧形拖曳力和冰脊形拖曳力三部分，建立了冰-水总拖曳系数同海冰和冰脊几何形态参数之间的定量关系，并由计算分析发现现场观测到的拖曳系数随密集度的非单调变化就是冰侧形拖曳力分量作用的重要体现。

This paper described the mechanism of the aero-engine windmilling drag, and theoretically deduced the formula for determining it in the simulated altitude test, and finally the experimental method for determining the engine windmilling drag was introduced.

本文分析了航空发动机风车阻力的产生机理，推导了发动机高空台试验中风车阻力确定的计算公式，介绍了航空发动机风车阻力确定的试验方法。

Firstly, the change of lift, drag and moment, applied on the insect or other animals with flapping-wing, was calculated and analyzed in the case of the coming flow which has different direction and constant velocity. It is found that the lift, drag and moment, applied on the insect, would change, when the flow velocity increases.

来流速度的方向相同、大小不同时，对模型翼扑动过程中产生的的升力、阻力和矩等气动力参数进行了分析计算，计算结果表明：来流速度增加，会使得昆虫等扑翼飞行动物所受升力、阻力发生变化。

According to the drag scraper and scooptram ore removal way in spontaneous caving of Tongkuangyu Mine, the advantages, disadvantages and suitable conditions of drag scraper and scooptram are elaborated.

根据铜矿峪矿自然崩落法电耙出矿与铲运机出矿应用实践，阐明电耙与铲运机出矿的优缺点及适用条件，论述自然崩落法出矿方式的选择依据，并指出出矿过程中应注意的问题。

Through the processes of grinding bastnaesite ore concentrate, mixing the ore powder with NaCO3 in the ratio of 1 to 0.1-0.4, roasting the mixture at 400-800 deg.c for 1-6 hr, elution of the roasted sand with hot water to obtain NaF, drying filtered drag after eluting NaF and mixing the dried drag with ammonium chloride, roasting the mixture at 300-600 deg.c for 1-3 hr, hot water soaking to obtain rare earth chloride solution, extraction with 20% kerosine solution of naphthenic acid, and hydrochloric acid counter extraction to obtain rare earth chloride product.

本发明涉及一种氯化铵法从氟碳铈精矿提取氯化稀土的方法，首先将氟碳铈原精矿磨细，并与NaCO 3 混合，其比例为原矿∶NaCO 3 ＝1∶0.1～0.4，混合均匀后在400℃～800℃焙烧1～6小时，焙砂用热水洗出NaF，洗出NaF的滤渣干燥后与氯化铵混合，于300℃～600℃焙烧1～3小时，再用热水浸取得到氯化稀土溶液，用20％的环烷酸煤油液萃取，再采用盐酸反萃得到氯化稀土产品。

In theory, oblique elliptic wing with an elliptic load has the minimum wave drag due to lift and induced drag.

理论分析表明，具有椭圆载荷分布的斜置椭圆机翼有最小的升致波阻和诱导阻力。

By solving the linearized atmospheric dynamic equation system including turbulent dissipation, the analytical solutions of wave drag and form drag over small scale terrain in a nocturnal stable boundary layer are obtained.

通过求解含有摩擦耗散的线性化大气动力学方程组，得到了在夜间稳定大气边界层中小尺度地形产生的波动阻力和形式阻力的解析解。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。