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friction drag
相关语句
  摩擦阻力
    Ermakov System and Friction Drag
    Ermakov系统和摩擦阻力
短句来源
    Research on drag reduction mechanism of supercavitation shows that supercavitation can reduce not only the friction drag coefficient but also the pressure drag coefficient.
    超空泡减阻机理的研究表明:超空泡不仅可以减小回转体的摩擦阻力,还可以减小回转体的压差阻力。
短句来源
    This paper is concerned with waverider optimized design,the object function was lift over drag ratio,viscous optimized process was completed by Nelder and Mead's method,Altitude and design length that determined the Reynolds number was discussed in the optimized process of waverider,The result is: Reynolds number is smaller,coefficients of friction drag is larger,and lift over drag ratio is smaller.
    特别是,研究了在高层大气飞行时雷诺数效应与气动特性的关系,从乘波体飞行高度与设计长度两方面探讨雷诺数对乘波体优化的影响,结果表明:给定设计马赫数和圆锥角情况下,对于最大升阻比优化乘波体,其雷诺数越小,摩擦阻力越大,而升阻比越低。
短句来源
  摩阻
    The flight drag of a projectile includes wave,base,friction drag under supersonic speed, and the base drag is about 20 ̄40 percent in total drag. To reduce the flight drag of a projectile is very useful to its trajectory.
    超音速条件下,弹丸的空气阻力包括波阻、底阻和摩阻,其中底阻约占总阻的20%~40%,减小弹丸飞行中的空气阻力对改善其弹道性能是十分有利的。
短句来源
  “friction drag”译为未确定词的双语例句
    THE INFLUENCE OF AIR FRICTION DRAG UPON THE MEASUREMENT OF GRAVITY ACCELERATION MEASUREMENT ON AIR-CUSHIONED GUIDE WAY
    气垫导轨测重力加速度时空气粘滞阻力的影响
短句来源
    The performan ce computation of these waverider configurations such as lift, friction drag,wave drag,lift-to-drag ratio,length,volume,volumetric efficiency,e ct, are presented.
    乘波机的性能计算包括升力、粘性阻力、波阻、升阻比、乘波机长度、体积、容积效率等乘波机的各主要性能指标。
短句来源
    the friction drag occupies the predominant position in the drag when the waverider require high volumetric efficiency,so the beginning design of waverider must take into account the friction drag.
    在乘波机容积效率要求较高的设计要求下,粘性阻力占乘波机阻力的主导地位,其初设计过程也必须考虑粘性的影响。
短句来源
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  friction drag
This is explained by a model that includes pressure drag according to the cross flow principle and friction drag in a new way.
      
The total drag is made up of pressure drag, base drag, and skin-friction drag.
      
Conventionally, solid lubricants have been used to reduce wear damage and friction drag under extreme conditions where liquid lubricants do not function properly.
      
Conventionally, solid lubricants have been used to reduce wear damage and friction drag under extreme conditions where liquid lubricants do not function properly.
      
The results are applied to a translating and spinning sphere and the rotation is found to reduce the friction drag and facilitate flow separation.
      
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The unsteady separated flow around a circular cylinder wassimulated numerically at suction boundary conditions after the periodicvortex shedding appearing in the wake.'The computation was based on thework of Beam,Warming and Steger,using two dimensional unsteady com-pressible Navier-Stokes equation. The results are shown which the totaldrag of a circular cylinder can be decreased under some suction condi-tions. Otherwise, the asymmetry in the wake and induced lift can also bealleviated by suction. But it...

The unsteady separated flow around a circular cylinder wassimulated numerically at suction boundary conditions after the periodicvortex shedding appearing in the wake.'The computation was based on thework of Beam,Warming and Steger,using two dimensional unsteady com-pressible Navier-Stokes equation. The results are shown which the totaldrag of a circular cylinder can be decreased under some suction condi-tions. Otherwise, the asymmetry in the wake and induced lift can also bealleviated by suction. But it is noted that the suction can lead to in-creasing the friction drag due to flow field changing near the suction wall.So it is necessary for decreasing drag by arranging proper suction intens-ty on proper wall surface area because the possibility of total drag in-creasing may be happened due to stronger suction intensity.

本文根据二维可压非定常N-S方程,用基于BeamandWarming及Ste-ger的方法,在圆柱绕流出现周期性分离后,施加吸气条件,研究吸气对于圆柱非定常绕流的影响。计算结果表明,在恰当的区域施加恰当的吸气条件,可以希望通过减小压差阻力来减小总阻力,吸气还有抑制尾迹中非对称流动的作用,从而使圆柱所受的垂直于来流方向的升力的变化幅度减小,变化频率减小。但是吸气会增加摩擦阻力,过份的吸气会导致摩阻增长太多,从而使得圆柱的总阻力不会减小反而增加。

In study of the flow through porous foam media,the geometrical model with the regular cube frame structure,and the relevant theoretical model,which accounts for the inertial effects caused by the matrix form drag as well as the effects coming from surface friction drag,are proposed to formulate a relation of non Darcy flow for porous foam media,including calculation of its coefficients. The permeability of foam media and the coefficient of square term in the nonlinear Forchheimer Ward expression can...

In study of the flow through porous foam media,the geometrical model with the regular cube frame structure,and the relevant theoretical model,which accounts for the inertial effects caused by the matrix form drag as well as the effects coming from surface friction drag,are proposed to formulate a relation of non Darcy flow for porous foam media,including calculation of its coefficients. The permeability of foam media and the coefficient of square term in the nonlinear Forchheimer Ward expression can be directly predicted by the structure parameters. The prediction of flow feature has so better agreement with the experimental results having practical value for application of the foam materials.

该文研究泡沫型多孔介质中的流动特性,提出了一种正立方几何框架模型和相应的数理模型。模型中既考虑了固体介质表面摩擦阻力的作用,也考虑了介质网丝形状阻力引起的惯性效应,得到适用于泡沫型多孔介质的非达西流关系式及主要系数的计算式。直接由结构参数即可求得泡沫材料的渗透率k及非线性F—W流动关系式中二次项系数F,其计算结果与实测值有较好的一致性。在这类多孔介质的应用中对流动特性的理论预测具有工程实用价值。

The flight drag of a projectile includes wave,base,friction drag under supersonic speed, and the base drag is about 20 ̄40 percent in total drag. To reduce the flight drag of a projectile is very useful to its trajectory. A mechanical model about a projectile with base cavity and side holes,which could reduce the base drag in supersonic speed,has been put forward in this paper. Since the comparison between calculations and experimental results is in good agreement,the model could...

The flight drag of a projectile includes wave,base,friction drag under supersonic speed, and the base drag is about 20 ̄40 percent in total drag. To reduce the flight drag of a projectile is very useful to its trajectory. A mechanical model about a projectile with base cavity and side holes,which could reduce the base drag in supersonic speed,has been put forward in this paper. Since the comparison between calculations and experimental results is in good agreement,the model could be taken as a basis for studying the drag reducing effect of side holes and to make an engineering prediction. In the end, the influence of different parameters of side holes on base drag has been discussed.

超音速条件下,弹丸的空气阻力包括波阻、底阻和摩阻,其中底阻约占总阻的20%~40%,减小弹丸飞行中的空气阻力对改善其弹道性能是十分有利的。该文提出了一个底凹弹在超声速条件下侧壁开孔减小底阻的数学力学模型。该模型经计算结果表明,与以往的实验结果相吻合,可作为探索底凹弹侧壁开孔减阻效应和工程计算的基础。文末对侧壁斜孔的不同参数对底阻的影响作了计算分析和讨论。

 
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