查询词典 wind tunnel

A detailed investigation was conducted in this paper on the flow asymmetry and its influencing factors over an ogive slender body model, incorporated with surface pressure measurement, skin oil flow pattern visualization, hot wire dynamic signal acquasition and other relevant approaches, in a low turbulence wind tunnel.

现代先进战斗机和战木导弹常具有细长前体，大攻角条件下前体背风面会形成非对称涡结构，从而产生很大的侧向力和偏航力矩，这会严重影响飞行器的可操纵性和飞行安全。

A detailed investigation was conducted in this paper on the flow asymmetry and its influencing factors over an ogive slender body model, incorporated with surface pressure measurement, skin oil flow pattern visualization, hot wire dynamic signal acquasition and other relevant approaches, in a low turbulence wind tunnel.The obtained test results demonstrate good accordance with those published abroad in the behavior, tendency of the flow asymmetry and the effects due to Reynolds number, incoming turbulence and model geometry etc.

本文通过模型表面压力分布测量、表面油流图谱显示和流场热线信号采集分析等手段，在低湍流度风洞中对细长拱柱体模型的大攻角流动非对称性及其影响因素进行了较为深入的研究，试验获得的细长体大攻角流动非对称性的特征、趋势以及Re数、湍流度和模型构型等因素对大攻角流动非对称性的影响规律，与国外资料上发表的结果是一致的。

To understand the properties of the transfer function of parallel tube-manifold system in wind tunnel test,an analysis is made of several parameters related to the transfer function on the basis of the dissipative model with some qualitative rules on perallel tube-manifold system obtained.

风洞刚性模型测压试验是获得建筑结构风荷载的重要方法。刚性模型的测压管路系统一般包括模型表面的金属短管及连接金属管和传感器的PVC管等管道元件。为了得到结构风压的完整信息，应在模型表面布置尽可能密集的测点。

The experiments are conducted with small parallelepiped samples vertically placed in a wind tunnel.

试验中，我们把呈平行六面体的样品竖向放置在风道中。

March 1960 AEDC report on wind tunnel tests of Pye Wacket lenticular configurations at supersonic speeds.

960年3月a edc报告对风洞试验的p yew acket透镜状配置在超音速的速度。

Wind-tunnel teds are reported of fire 3-blade 10-foot propellers operating in front of a radial and a liquid cooled engine nacelle.

EARTMAN 有报道指出测控的火3-blade 3米操作前推进器径向和液体冷却发动机实现。

The paper expresses aerodynamic optimization design of lower Reynold number high-lift airfoils using genetic algorithm,wind-tunnel experimental of design airfoil tests correctness of design.

利用遗传算法进行了低雷诺数高升力翼型的气动优化设计，并利用风洞实验检查了设计的正确性。

Riblet surface' flow field were tested separately in low speed wind tunnel and distribution of turbulent boundary layer flow parameters was obtained.

在低速风洞中对制备的脊状表面进行流场测试，获得了其湍流边界层内流动参数的分布情况。

Riblet ; turbulent drag ; reduction wind tunnel test

沟纹薄膜；湍流减阻；风洞实验

The mean velocity distributions in turbulent boundary layers of smooth surface and two different riblet surfaces are measured with IFA300 constant-temperature anemometer in low-speed wind tunnel to validate the full development of turbulent boundary laye. Friction velocity and wall friction stress of turbulent boundary layer are obtained with the least-squares fitted curve of the sublayer velocity distribution based on Spalding formula, and virtual origin position of riblet surface can be acquired accurately.

在低速风洞中来流速度一定的情况下使用IFA300恒温热线风速仪测量了光滑表面和两种不同尺寸的脊状表面湍流边界层平均速度分布剖面，并验证了试验段湍流发展的充分性；通过应用Spalding壁面公式使用最小二乘法精准拟合了实验测量的边界层内层速度分布曲线，得到了湍流边界层壁面摩擦速度并进一步求得湍流壁面摩擦应力，较准确地计算出脊状表面的虚拟原点位置，并通过与对数律公式拟合结果比较分析，证实了该方法更加准确有效。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。