风洞

The along-wind vibration and across-wind vibration , icing situations of Guyed Mast are also studied, furthermore, the parametric vibration, the phenomenon of jump and chaos of the Guyed Mast are investigated; also, the wind tunnel experiment of Guyed Mast first made in China is finished and the test result, along with measurement of the real structure, are examined, which provide the reasonable theory and reliable experimental data for the revision of the high-rise structure code.

本文系统地研究了桅杆的顺风、横风以及在裹冰下的风效应，并进一步分析了桅杆的参激振动、跳跃及混沌现象等，完成了国内首次桅杆结构的风洞试验，分析了桅杆实测和试验结果，为今后高耸结构规范的修订提供了的合理的理论依据和可靠试验数据。

It is, by now, standard practice at Boeing to design aerodynamic surfaces such as the wings, engine nacelles, and fuselage using CFD instead of relying on expensive wind tunnel and flight tests.

这是现在，标准的做法波音公司设计的空气动力学表面如机翼，引擎舱，与机身采用计算流体力学而不是依赖昂贵的风洞试验和飞行试验。

Furthermore, it is verified that the peak suctions are highly correlated with the conical vortices by coherence functions of fluctuating pressures.

通过综合一些典型大跨度平屋面结构的风洞试验结果，分析了这种结构风敏感方向的风压分布特征及其产生机理。

Wind tunnel experiments were conducted to test anti-wind erosion capacity of different crop stubbles in Horqin Sandy Land. The main influential factors of wind erosion were analyzed in the field condition.

利用野外风洞设备，以翻耕地为对照，对科尔沁沙地东部农田的4种不同作物茬地抗风蚀效果进行了测试，对风蚀主要影响因子进行了分析。

The technology of oil flow and silk thread can reflect effect of the vertex generators controlling the boundary layer separation of the wing truly.6 The single hot line doesnt fit for the measure of the three-dimensional boundary layer downstream of the vertex generators, according to the result of the flow visualization.

油流和丝线流动显示技术可真实反映涡流发生器对机翼附面层分离的控制效果。 6根据流动显示结果，指出单丝热线不适合用于涡流发生器下游具有较强_维流动的附面层测量。关键词：涡流发生器，超临界机翼，附面层分离，控制，风洞实验

With fuels of hydrogen and hydrogen-ethylene mixture in the wind tunnel heater, experiments to study hydrogen combustion in scramjets were carried out.

本文选择氢气及氢气－乙烯混合气体两种燃料在风洞加热器中加热空气来开展氢气燃烧的研究实验。

The simulation results of the model are consistent with the results of wind tunnel experiments. It shows macroscopically the rationality of the distribution function of lift-off velocity of saltating sand grain.

数值计算结果显示，风沙流垂向质量百分浓度与风洞实验结果符合得较好，这在宏观上说明沙粒起跳初速度分布函数的合理性。

By analyzing the results of wind tunnel experiments,we thought that the PIV techniques have many advantages against the traditional measurement methods especially in measuring the velocity and concentration of saltating sand clo.

通过分析一系列的风洞实验结果，我们认为，在风沙流中颗粒速度分布、浓度分布、风沙地貌形成演化、防沙工程原理及应用方面，粒子图像测速技术具有一定优势，可以克服传统测量手段的某些不足。

Parameters of movement process of saltating sand grains The thesis studies some motion parameters of saltating sand grains by using wind tunnel experiment and computer simulation.

沙粒跃移运动参数利用风洞实验与计算机数值模拟技术，研究了跃移沙粒运动参数。

It would also help to obtain integrity trajectories of saltating sand grains by extending bitty saltating trajectories grained from wind tunnel experiment in order to understand deep sand grain saltating motion.

这项研究为跃移沙粒运动参数分布函数研究提供了一条新思路，有助于将风洞实验获得的沙粒跃移运动的片断轨迹拓展，进而获得沙粒跃移运动的整个轨迹，以便深入理解沙粒跃移运动。

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％。