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Dependences of the lift coefficient and the cavern length on the cavitation number are presented for rectangular wings for 0.25≤λ≤4.


Nonmonotonic relationship between the Reynolds number and the lift coefficient of a plate in a hypersonic rarefied gas flow


The problem of profiling optimal airfoils at small incidence in a supersonic stream in order to achieve the minimum wave drag coefficient for given chord, longitudinal section area, and lift coefficient is studied.


Solutions of the problem of the optimal shape of a waverider constructed on plane shocks are derived for given lift coefficient and specific volume, both with and without constraints on the waverider dimensions.


For calculating the lift coefficient the assumption of a thin jetlet flowing between the horizontal region of the airfoil contour and the ground surface is introduced.

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Dependences of the lift coefficient and the cavern length on the cavitation number are presented for rectangular wings for 0.25≤λ≤4.


Nonmonotonic relationship between the Reynolds number and the lift coefficient of a plate in a hypersonic rarefied gas flow


The problem of profiling optimal airfoils at small incidence in a supersonic stream in order to achieve the minimum wave drag coefficient for given chord, longitudinal section area, and lift coefficient is studied.


Solutions of the problem of the optimal shape of a waverider constructed on plane shocks are derived for given lift coefficient and specific volume, both with and without constraints on the waverider dimensions.


For calculating the lift coefficient the assumption of a thin jetlet flowing between the horizontal region of the airfoil contour and the ground surface is introduced.

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Data are presented on the drag and lift coefficients of prismatic bodies with an aspect ratio of λ=0.151.0 near a screen.


For small lift coefficients, the hodograph domain covers two Riemann sheets and a finitedifference method is used to solve the boundaryvalue problem on this domain.


Curves for drag and lift coefficients are provided and compared with previous numerical studies.


The surfacepressure distributions of two spheres were measured for the various relative positions of two spheres and the drag, sideforce, and lift coefficients were determined from surfacepressure distributions.


Drag and lift coefficients evolution of a Savonius rotor

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We estimate the lift force coefficient for touching spheres to be 0.577771, compared to the most accurate earlier estimate of 0.51435 by Miloh (1977).




 Aiming at the YZ_ 22 vehicle and the 16 m simply supported beambridge in crosswind,based on the numerical simulation,the conclusion that both the drag coefficients of the vehicle and the 16 m freebeam bridge with different angle of attack become obviously large is presented when the YZ_ 22 vehicle is running on the 16 m freebeam bridge,compared with those only considering the vehicle or the bridge;Correspondingly,wind loads on both of the 16 m freebeam bridge and YZ_ 22 vehide should be adjusted.  采用数值模拟技术 ,分别计算了横风中不同来流攻角下 YZ2 2型车辆单体、铁路 1 6m预应力 T形简支梁桥单体、YZ2 2 型车辆和铁路 1 6m预应力 T型简支梁桥组合体的阻力系数和升力系数 .研究表明 ,当 YZ2 2 型车辆通过铁路 1 6m T形简支梁桥时 ,YZ2 2 型车辆和 T形简支梁桥所受风荷载均比各自单独存在时明显增大 ,认为在桥梁设计时 ,应考虑车辆过桥对桥梁风荷载的影响 .  The aerodynamic characteristic of deck section is one of the most concerned aspects by the bridge designers in long span bridge design. It is common that the attack angles of the coming wind and the structure or outline of the deck are paid more attentions than others in wind tunnel tests. Nowadays, a bridge deck with a slot in the middle is popular in engineering design because of the improvement in aerodynamic characteristics and in the steadiness of the whole bridge. But it is a pity that the research work... The aerodynamic characteristic of deck section is one of the most concerned aspects by the bridge designers in long span bridge design. It is common that the attack angles of the coming wind and the structure or outline of the deck are paid more attentions than others in wind tunnel tests. Nowadays, a bridge deck with a slot in the middle is popular in engineering design because of the improvement in aerodynamic characteristics and in the steadiness of the whole bridge. But it is a pity that the research work is seldom done in such a particular field. In this article such a problem concerning about the influence of the various widths of the slot on the aerodynamic characteristics of the deck section was discussed based on the results of the timeaverage pressure on the deck surface from the wind tunnel tests. The corresponding lift, drag and moment coefficients were calculated in order to demonstrate the aerodynamic effects of the existence of the slot and the various widths. The aerodynamic effects by a barrier in the middle of a slot were also discussed. It is found that the variations of the width of the slot play an important role in affecting the surface pressure while the existence of the barrier does not.  大跨度斜拉桥或悬索桥的桥梁主梁断面的气动外形是桥梁设计者们很关心的问题之一。对主梁节段模型气动力的风洞实验研究一般都只考虑了来流攻角以及模型本身结构外形的影响,而现今不少大桥在双向来回车道的中间开有槽缝,工程上可以用来改善桥面的空气动力特性以及桥梁本身的稳定性,对于这方面的实验研究进行得不多。本文拟通过风洞实验对某大桥桥梁主梁断面在各种开槽情况下的静态压力分布进行研究,进而对断面各测点的压力分布进行矢量求和获得升力系数、阻力系数和升力矩系数,由此来研究开槽与否以及开槽大小对该桥梁主梁断面的气动力的影响,同时也研究了槽中央隔板的存在对气动力系数的影响。研究表明,隔板的有无对气动力并无明显的影响,而开槽与否以及槽宽的大小对压力分布、升阻力系数以及升力矩系数有明显的影响。  The drag, lift and moment of box beam deck sections with different ratios of width to height (B/H) in TJ2 wind tunnel are measured in this paper. The Reynolds number effect of the mean aerodynamic force coefficient and the influence of ratio of bridge deck width to its height on three mean coefficients are studied. The results show that: (1) The mean drag and lift coefficients of box shape bridge deck section have considerable Reynolds number effect; (2) the ratio of width to height(B/H) affects on Reynolds... The drag, lift and moment of box beam deck sections with different ratios of width to height (B/H) in TJ2 wind tunnel are measured in this paper. The Reynolds number effect of the mean aerodynamic force coefficient and the influence of ratio of bridge deck width to its height on three mean coefficients are studied. The results show that: (1) The mean drag and lift coefficients of box shape bridge deck section have considerable Reynolds number effect; (2) the ratio of width to height(B/H) affects on Reynolds number effect of the mean aerodynamic force coefficient obviously. The result given by low Reynolds number wind tunnel test is conservative.  在较大的雷诺数范围内测量了不同宽高比箱形桥梁断面的三分力系数 ,研究了三分力系数雷诺数效应以及宽高比对断面三分力系数雷诺数效应的影响。流线型桥梁断面的阻力系数、升力系数都有明显的雷诺数效应。宽高比对断面的三分力系数雷诺数效应有明显的影响。低雷诺数风洞试验得到的三分力系数用于实桥分析时偏于保守   << 更多相关文摘 
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