风洞

A multiminate layer vapor screen technique and force measurement technique for an unsteady flow in the intermitted wind tunnel is presented in this paper.

本文介绍在暂冲式三声速风洞中实现了非定常流动的多片光蒸汽屏显示技术和测力技术，并用这两项技术研究了亚声速时70°后掠三角翼模型俯仰振动的非定常流动现象，探讨了由于三角翼模型俯仰振动产生的涡结构与纵向气动力特性之间的相关关

The key elements and techniques of the numerical wind tunnel are studied and analyzed.The basic idea of CFD is expatiated and the whole working process is presented.Discrete methods of the control equations based on the finite volume method and the PISO algorithm about the fluid numerical computation are researched also.

对基于CFD的数值风洞关键基础和技术进行研究分析，阐述了CFD的基本思想，研究了基于有限体积法的控制方程的离散方法以及流场的数值求解的PISO算法。

A full-scale measurement of wind pressure distributionon a group of two 120m high,ribless hyperbolic natural draft coolingtowers in Beijing area is described in this paper.

在对两座高120米双曲线型自然通风冷却塔群的风压分布的全尺寸测量，特别是风压测量系统及其参考压力的测量方法介绍之后，分析了冷却塔运行方式及来流方向对塔面风压分布的影响；并将全尺寸测量与风洞实验及单塔实测结果进行了比较。

Flight behavior of the oriental armyworm Mythimna separata moth in airflow was studied systematically using wind tunnel and scanning entomological radar.

通过改进悬吊测飞技术、室内风洞和野外雷达相结合的观测方法，研究了粘虫在气流场中的飞行行为特征及其与气流的关系。

Based on the principle of heat mass analogy,the convective heat transfer coefficient on rolling tire surface was simulatively investigated with a linearly moving rotary disc in a wind tunnel by using naphthalene sublimation technology.

根据热质比拟的基本原理，采用萘升华技术，在风洞中利用直线运动的旋转圆盘模拟研究了滚动轮胎表面的对流换热系数。

At this time the test took place in the transonic tunnel T-128. What worked out?

到目前为止，在近音速风洞T128 中的测试，得到了啥子结果了么？

The wind Tunnel/flight Correlation panel discussed the validation of the National transonic Facility in the following order.

风洞与飞行相关性小组按下列顺序讨论了国家跨声速设备的鉴定工作。

Results indicate:(1) The newly developed simulation technology can form fairly average and easily controllable back pressure downstream the inlet, so it can he used to investigate the back pressure characteristics of hypersonic inlets.(2) By regulating the valve of injection pipe, the simulation technology can realize the switch of hypersonic inlet started state and unstarted state in about 8 milliseconds, so it is suitable to investigate the starting/unstarting/resarting problem of hypersonic inlets.

结果表明：(1)所提出的凹腔喷流技术可在进气道下游形成较为均匀的、可控的背压环境，因此可用于进气道的反压特性研究；(2)适当调节凹腔的喷流总压，并在实验中实时控制阀门的开度，凹腔喷流技术能够在较短的风洞实验时间内（约8s）实现进气道起动、不起动、再起动流态之间的切换，因此可用于进气道的不起动／再起动特性研究。

About the experiment, these experiments were conducted in the free stream wind tunnel, and vitiated air heater was used to simulate the high altitude flow condition.

试验方面：本文试验在自由射流风洞中进行，利用空气加热器模拟高空飞行条件。

That decelerates a stream of gas or liquid from a high to a low velocity.

扩散道风洞中的气流变迁，将会调整度的气体或液体流降到低速

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％。