诱导阻力

根据P－M理论，计算了五种三翼面飞机和试验模型的诱导阻力因子、升阻比以及翼面升力比等。

On the basis of P-M theory , the calculations are made for the induced drag factor , the ratio of lift to drag , and the ratio of lift in surfaces on five kinds of three-surface planes and test models .

DX抗拔桩阻力与承载力现场试验论述阻力有两种：寄生阻力和诱导阻力。

TOPIC OF DX PILE WITH THE STRESS AND THE BEARING CAPACITY There are two kinds of drags , parasite drag and induced drag .

采用Lagrange乘数优化方法，约束升力系数和机翼翼根弯矩，通过修改机翼+翼梢小翼组合体的结构外形，减小机翼的诱导阻力和形状阻力，提高机翼的展向效率和升阻比的大小。

The Lagrange multipliers optimization method is presented for wing + winglet configuration with constraint for lifting coefficient and wing root bending moment . By shaping the wing with winglet , decrease the sum of induced drag and profile drag , increase span efficiency and lift-drag ratio .

本文应用有限基本解法（涡格法）及联合流场概念，计算出CK-1机带翼梢小翼的升力系数及诱导阻力系数。

The lift coefficient and induced drag coeffcient of the CK-1 wing with winglets are calculated in . this paper by the vortex-lattice method and the concept of united flowfield being used .

减小弹性机翼诱导阻力的多控制面优化研究

Induced drag reduction optimization study using multi-control surfaces for elastic wing

这个合升力的水平分力就是诱导阻力。

The aft component of this lift vector is the induced drag .

减阻是飞机设计的主要任务之一，翼梢小翼能有效降低飞机的诱导阻力。

Drag reduction is one of the main goals in aircraft design .

翼梢小翼影响一部分名为诱导阻力的阻力。

Winglets affect the part of drag called induced drag .

详细阐明了地面效应对诱导阻力的影响规律。

The influence of ground effect on induced drag is analyzed in detail .

翼尖涡沿着展向方向向外移动，机翼诱导阻力减小。

Tip vortex goes downstream outward along the span direction , and the induced drag of the wing decreases .

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。

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

双阻板矫治器功能矫形力与磁力的协同作用研究阻力有两种：寄生阻力和诱导阻力。

The Study on Coordinating Functions between Rectifying and Magnetic Forces ; There are two kinds of drags , parasite drag and induced drag .

兼性寄生菌能够象寄生虫或腐生物一样生存。阻力有两种：寄生阻力和诱导阻力。

A facultative parasite can exist as a parasite or a saprophyte . There are two kinds of drags , parasite drag and induced drag .

本文通过风洞吹风试验，找到一种后掠鱼鳍形的翼尖小翼装置能很好地减小其诱导阻力。

Through wind tunnel experiments , it is discovered that a type of sweepback fin-shaped winglet can efficiently reduce the induced drag of this kind of aircraft .

阻力有两种：寄生阻力和诱导阻力。他极力小心翼翼地举着她，唯恐碰坏了她。

There are two kinds of drags , parasite drag and induced drag . He carried her with as much care as if he feared to break her .

联结翼布局与常规布局相比具有结构重量轻、诱导阻力小、升力系数大和稳定性良好的特点。

The joined-wing configuration , as compared with the normal configuration , is characterized by low structural weight , small induced drag , big lift coefficient and good stability .

研究人员发现，此种布局构型除了结构和质量方面的优势，在理论上通过改变2个机翼之间的升力分布可以使得飞机的诱导阻力有较大减少。

In addition to advantages in structure and weight , this configuration can theoretically provides 50 % reduction of induced drag through varying the lift distribution between the two wings .

总面积为3.1%基本翼面积的翼尖帆片对减少诱导阻力具有明显效果，诱导阻力因子减小20%左右。

The wing sails with 3.1 percentage of essential wing area have observable efficiency in reducing induced drag . The factors of the induced drag were reduced by 20 percent .

翼梢小翼可以有效抑制翼尖涡，减小诱导阻力。

Winglets can be used to inhibit wingtip vortex and to reduce the induced drag effectively , which guarantees the reduction of flight cost and improvement of climbing / landing performance .

对带翼梢小翼亚音速矩形翼进行了升力计算，并用联合流场法计算了诱导阻力。

A constant roll-angle method is used to divide spanwise lattices and to determine spanwise locations of control points , and the induced drags are calculated by the combined flow field method .

实验表明，与常规飞机相比连翼机具有如下优点：诱导阻力小，升阻比大且具有较好的失速特性。

The Low-speed wind tunnel tests have shown that the joined wing provides the following advantages over a comparable wing-plus-tail system : lower induced drag , higher lift-to-drag ratio and better stall characteristics .

利用尾迹积分法按阻力产生的物理机制，将阻力分解为熵增阻力和诱导阻力进行数值计算。

Drag was decomposed to entropy drag and induced drag , according to the physical mechanism of drag production , based on the wake integral method , which was very useful for drag reduction design .

在飞行器所在流场的下游一垂直于来流速度的截面上进行积分计算，得到升力、诱导阻力、激波阻力和总阻力。

By doing integral computation on the wake surface that is down from the aircraft and vertical to the velocity of far field , it can get the lift , induced drag , wave drag and the total drag .

采用基于面积比思想的半经验工程算法计算了双三角翼飞机的升力系数曲线斜率、零升阻力系数和诱导阻力因子。

By using the semi experiential engineering arithmetic based on the ideology of area ratio , the slope of lift coefficient curve , the zero lift drag coefficient and the induced drag factor of double delta wing aircraft were calculated .

最后针对本文的实例，目标函数为机翼诱导阻力最小，分别结合拟牛顿法和序列二次规划法，对有/无翼根弯矩约束的两种情况，进行了优化求解，取得满意的优化效果。

In the forth , optimization object is minimum of induced drag for wing , with / without the bending moment constrain at wing root , combined with sequence quadratic programming or quasi Newton methods , respectively . The results show that optimization effect is satisfied .

测试结果表明，该风口的诱导比大，阻力小，噪声低，送风比较均匀，风口没有结露现象，结构简单，造价低。

The results show that the diffuser has such advantages as larger induction ratio , low resistance and noise , relatively even air supply , no condensation , simple in structure and low in costs .