风洞

Aeolian grain transport on the soil-like surface composed of fine sand and silt is measured in a wind tunnel.

通过风洞实验研究了由细沙粒和粗粉粒组成的类土壤颗粒的风力输运过程。

In this paper, the problems mentioned above are studied by both wind tunnel experiment and numerical simulation to improve the knowledge about aeolian grain transport, and impel the development of this subject.

因此，本文通过风洞实验和数值模拟对以上问题加以深入研究，以深化对风成地表颗粒物输运规律的认识，推进学科的发展。

Results predicted by this method are compared with experimental data and the accuracy of this method is found to be very good within the constraints of slender body theory. This method can quickly and accurately provide aerodynamic force coefficient for percept and preliminary design of the non-circular cross section missile.

经过对大量风洞实验模型的预测结果和实验结果的比较，表明该方法在细长体理论的范围内具有较好的精度，易于实现，可以为非圆截面导弹总体方案论证和初步设计阶段提供空气动力特性。

Wind tunnels in general are used for testing purposes and aerodynamical optimization.

译文风洞大体上讲是用来得到测试试验结果和空气动力的最佳化。

Base on the systematically geological investigation and study, we choose to use aremote sensing data source,the geography control data source(1:50,000relief map of Qiaojia and measured GPS ) as the data source of this research, adopt"Digital Landslide"processing image data, and carry on time-space analysiscombining geological investigation and related data. Application aerodynamicist theories, some important conclusions that obtained from the wind-tunnel experiment,and according to the time –space analysis result, we analyzed the landslide dammingmovement mechanism, presumed the movement format of this high-speed landslide,studied the formation mechanism and the movement characteristic of this landslide ,calculated it's movement equation, applied VC language to write calculationprocedure of each stage of the landslide, computed movement speed and displacement,and made sure its possible stop district.

本文在前人研究的基础上，选用遥感数据源、地理控制数据源(1：5万巧家幅地形图及实测GPS点)为本研究的数据源，采用"数字滑坡"技术处理图像数据，结合野外实地考察及相关资料对石膏地滑坡进行了时空分析；运用空气动力学理论，采用胡厚田等人在风洞实验中得出的许多重要结论，根据时空分析结果分析滑坡的运动机理，推测高速滑坡的运动模式；研究石膏地滑坡的形成机理、运动特征及运动方程，并用C++语言在VC开发环境中编写滑坡各阶段的计算程序，计算滑坡的流动速度及运动位移，确定其可能的停止区域。

Using the methods and software of this thesis some flow regulations, design principles and criteria are developed to give more accurate and credible aerodynamic coefficients of ailerons.

模拟了舵面在不同缝隙、不同舵面偏角及来流迎角下的复杂流动问题；结合对舵面气动特性的风洞试验结果的分析，归纳总结出舵面铰链力矩随缝隙、舵面偏角、来流迎角、马赫数的变化规律，探讨了如何将数值计算与风洞试验相结合为飞机设计提供准确、可信的舵面气动特性参数的方法。

Hot-humid climatic wind tunnel paper introduced can simulate above natural climate environmental elements according to the variant velocity of flow and simulated solar radiant intensity regulation.

介绍的动态热湿气候动态风洞实验台，在传统风洞风速模拟与控制实验技术基础之上，通过增加太阳辐射模拟和空气温湿度控制，初步实现了对室外自然气候中太阳辐射、风速及温、湿度环境的模拟控制。

At first, the wind tunnel test and test data process of this study are introduced in detail. A method to calculate expected extreme values of time series with a long time interval is then proposed with its sub-sections based on the classical Gumbel theory for extreme values and the independence of observed extreme values. At last, the extreme values of the wind pressure coefficients of the present wind tunnel test are calculated with the proposed method and methods used widely at present, such as peak factor method, improved peak factor method and Sadek-Simiu method.

首先 介绍了风洞试验及试验数据处理的基本概况；然后在阐述经典Gumbel极值理论的基础上，根据观察极值的相互独立性推导了短时距下极值分布参数和长时距下极值分布参数的关系式，给出了一种由短时距样本推算长时距下的极值估算方法；最后基于风洞试验数据，将常用极值估算方法(峰值因子法、改进峰值因子法和Sadek-Simiu法)和该方法的计算结果进行了比较。

The running quality of the wind tunnel power shaft system has a decisive influence on the efficiency and performance. With increase of the runtime of the shafting, rotor parts have inevitable mass eccentricity, which obviously strengthens the coupling function of torsional and bending vibration.

风洞动力轴系的运行品质对风洞的效率和性能有决定性的影响，随着轴系在役运行时间的增加，转动部分多数会有质量偏心现象出现，这使得轴系的扭转振动与弯曲振动的耦合作用明显增强。

The low speed institute of CARIA has developed the new technology through which the low speed wind tunnel force measurement test for civil airplanes are carried out. In order to reach the international standard, we have sequentially designated the special strain ganged balance, and improved the model support and the steady wind speed's controlled system. At last, we prove it validity by the test of CRJ which is the civil airplane's model.

民机低速风洞测力试验技术是中国航空工业空气动力研究院低速所新研制的一项试验技术，为了达到国际先进测量水平，该项技术先后成功研制了专用的应变天平，改进了模型支撑和稳风速控制系统，用CRJ民机模型进行了风洞试验验证。

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％。