背风面

迎角大于33°，分离涡保持在机翼的背风面，形成驻涡现象。

While at angles larger than 33 °, the primary separation vortices stay above the wing lee side , forming a stationary vortex .

在山脊位于背风面，这些都是灰丰富的物质可能类似存款，再吹出来的火山口。

Located on the lee side of ridges , these are probably similar deposits of ash-rich material , again blown out of the crater .

与背风面相比，由于受到盐雾影响，迎风面叶片的叶缘或/和叶尖出现枯焦，叶绿素、含水量下降，积累更多Na和更少的Ca、Mg，而K差别不大。

In contrast with leeward , windward leaves faded at the top end and around , following with contents of chlorophyll and water descended , while accumulated more sodium and less calcium and magnesium but potassium contents changed little , due to the spoondrift effect .

林带背风面湍流谱特征的初步分析

A preliminary spectrum analysis on turbulence in leeside of windbreaks

尖顶襟翼／涡襟翼干扰对三角翼背风面流动的影响

Effect of Apex-Flap / Vortex-Flap interaction on Lee-Surface Flow over Delta Wing

超声速细长梯形翼背风面流型

Types of Flow over Leeside of a Slender Tapered Wing at Supersonic Speeds

通过数值方法研究了高速气流中细长三角翼作匀速上仰机动飞行时的背风面分离流与涡破裂特性和气动力特性。

The transonic separated flows around a pitching delta wing and vortex breakdown and aerodynamics characteristics are studied numerically .

研究结果表明：换热管翅片迎风面换热效果明显高于背风面；

The simulation result shows : the windward of pipe have a better heat exchange effect than the leeward ;

在一定吸气强度下吸气可使翼型背风面上涡的非定常脱落现象消失从而起到驻涡作用；

If suction pressure is strong enough , the unsteady vortex shedding phenomenon can be eliminated and steady flow formed .

结果表明：车体迎风面及背风面表面压力分布规律基本一致，验证了数值模拟计算模型的准确性；

The results show that the pressure distribution on external surface at both windward and leeward is basically the same .

但增加了热压作用后，可明显改善庭院式建筑背风面和侧面房间的自然透风效果；

The natural ventilation efficiencies of the leeward and side rooms can be improved when the hot pressure is increased .

除油流结果外，其它结果都表明椭球体模型背风面上的流动是不对称的。

Except oil flow patterns , all other results indicate that flows are asymmetric on the leeside of the ellipsoid model .

把石头堆成一道堤坝发现在丁坝的上游会形成马蹄涡，在丁坝的背风面会形成卡门涡。

Heap stones to form a dam There are horse shoe vortex around spur dikes and Karman vortices behind spur dikes .

实验和分析表明，卵柱体背风面上的激波对不对称的旋涡谱有很大的影响。

Tests and analyses have shown that the shock on the leeside surface has a large influence to the asymmetric vortex pattern .

由颗粒运动轨迹可以看出，动态驻极体的背风面有带电颗粒的沉积，这是由静电力的作用而造成的。

As can be seen from the particle trajectory , the particles are deposited on the back of dynamic electret filter fiber because of the electrostatic force .

本文根据湍流统计理论和野外观测数据，详细分析了林带背风面湍流自相关、空间相关和湍流积分尺度特征。

In this paper , autocorrelation , space correlation , and integral scale of turbulence were discussed , using theory of turbulence statistics and field observation data .

结果表明，林带背风面2.5~19H范围内形成的风速降低区，是林带主要保护区和作用范围。

The results show that , the whole protection area is composed of primary area leeward shelterbelt from 2.5H to 19H and second area windward shelterbelt within 3.5H .

给出了前缘后掠65°、双弧形剖面的细长梯形翼背风面流动显示结果。

This paper describes a flow visualization experiment over the leeside of a slender tapered wing with a leading edge sweepback angle of 65 ° and a biconvex section .

本文应用湍流谱分析的方法研究了林带背风面湍涡运动的周期、频率和振幅等谱特征。

The spectrum characteristics of turbulence such as period of fluctuation , frequncy , and amplitude of oscillation were discussed by using the method of spectral analysis of turbulence in this paper .

随着叶龄的增加，迎风面叶片与背风面叶片元素含量、叶绿素、含水量变化趋势相近。

As the results showed , with the augment of leaf age , the changing trend of contents of ions , chlorophyl , and water in windward leaves were similar with leeward 's.

涡结构对小颗粒在圆管背风面碰撞分布的影响

Using AFS algebra and AFS structure , any human ordinary fuzzy concept can be represented . Influences of vortices on impaction and distribution of small ash particles on rear side surface of boiler tube

结果表明，激波对三维物体与山坡的接合部、物体背风面及其拐角位置的影响是最大的；

The test results indicate that the effect in the flow field of shock wave is the largest at the copulation of3 D object and hill , the object leeward surface and its corner .

在台风中心相对于中央山脉在不同位置时，气流的入流角近垂直于中央山脉的情况下，最有利于高地形背风面诱生出地形低压。

Experiments of the different relative location of typhoon and Central Mountain Range show that the wind is most propitious to cause the terrain depression when the wind approximatively upright with Central Mountain Range .

分别采用数值方法和实验方法研究了大后掠角三角翼大攻角条件下，背风面开缝吸气对流场结构和气动力特性所造成的影响。

The numerical method and experiment technique were conducted to investigate what effect will be produced on the flow structure and aerodynamics over the highly swept delta wing with suction technique in the Lee Side at high angle of attack .

比较了车-桥系统中不同梁高情况下列车位于迎风面、背风面、并行时的三分力系数，评估了列车不同运行位置情况下列车的行车安全性。

Compare the mean aerodynamic force coefficient of the train which is on the windward side , leeward side and parallel condition in different beam heights in the train-bridge system , assess the traffic safety when the train running in the different position . 4 .