查询词典 hum reduction factor

Fuel gas, produced by the reduction of coal and peat, was used for heating as early as 1840 in Europe and by 1884 had been adapted to fuel engines in England.

燃料气体，所产生的减少煤和泥炭，用于取暖早在1840年在欧洲和1884年已适应燃料发动机在英格兰。

These results have very important referenced values to simulative calculations and experimental researches on drag and noise reduction with riblets under water.

本文的研究内容对随行波表面水下减阻降噪的仿真模拟计算和实验研究具有重要的参考价值。

In this paper, a theoretical investigation of the drag and noise reduction by riblets is carried out, and these numerical results are compared with those obtained from experiments with riblets in water tunnel, and it is found that they agree with each other in tendency and numerical value.

本文从理论上分析了条纹表面的减阻降噪特性，并将计算结果与水洞模型贴膜实验进行了对比，两者在趋势和数值上基本一致。

Experimental study and numerical simulation about turbulent boundary layer drag reduction of riblets surface were carried out for increasing voyage and speed of vehicle.

针对航行器提高航程和航速的需要，开展脊状表面湍流边界层减阻的实验和数值仿真研究。

In order to reduce the skin friction efficiently,more research works should be done on the characteristics of turbulent boundary layer,turbulent coherent structures and the mechanism of turbulent drag reduction for flow over riblets surfaces.

为更有效地减少表面摩阻，必须深入开展对沟槽面湍流边界层特性、湍流拟序结构及湍流减阻机理等方面的研究。

Based upon the new explanation of the structure of turbulent boundary layer and the fact that specially designed non-smooth surface can reduce fluid drag,the authors have designed and fabricated the Riblets Drag Reduction Film.

作者根据湍流附面层结构新的解释及非光滑特殊造型表面可以减小流体阻力的事实，作者研制了微肋条减阻薄膜，贴在赛船上参加比赛，获得好成绩[1、2 ] 。

Results of simulation indicate that a series of "second-vortex" are produced in the riblets structure, turbulent kinetic energy and turbulent burst intensities are debased, which reveals reasonably turbulent drag reduction mechanism.

数值仿真结果则发现，在脊状结构内形成了稳定的&二次涡&，边界层内湍动能和湍流猝发强度降低，很好地揭示了减阻机理。

Numerical simulations of fully developed turbulent flow over triangle,scallop and blade riblets biomimetics non-smooth surface were performed to educe the reason of different drag reduction by different riblets,which can provide guide for design optimization riblets.

分析了三种沟槽非光滑表面的流场特性，对计算域中心Z=3mm平面的速度场和湍流统计量进行了研究，分析了不同沟槽形状对减阻效果的影响，为最佳减阻沟槽设计提供了理论依据。

The results of simulation show that a series of "second-vortex" are produced when streamwise "reverse-vortices" are effected by riblets. They weaken intensities of "reverse-vortices", and restrain the productions and developments of low-flow strips, so turbulent drag reduction is obtained.

仿真结果表明，沟槽表面与顺流的&反向旋转涡对&相互作用，产生&二次涡&，削弱了&反向旋转涡对&的强度，进而抑制了低速条带的形成和发展，从而降低湍流猝发强度，实现湍流减阻。

The experimental velocities cover subsonic,transonic and supersonic flows,and the content includes:(1) flow over flat plate,revolution body and wing with riblets surface at zero angle of attack;(2) the effect of pressure gradient,angle of attack and slide angle;(3) the burst characteristics,characteristics of turbulence,the streak structure in the near wall region and the drag reduction mechanism.

内容涉及沟槽面平板、旋成体、机翼等在压、跨、超音速流动情况下的实验研究成果；压力梯度、攻角、侧滑角等的影响；湍流猝发特性、紊动特性、近壁区带条结构的特征及减阻机理等方面的工作。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。