音速

Airplanes can fly at the velocity of sound.

飞机能以音速飞行。

With the design method described and design standard proposed in this thesis, a transonic NLF wing has been designed. Calculation shows that this NLF wing has, even in case of full turbulent boundary layer flow, good transonic aerodynamic characteristics.

本文结合民机预研项目，根据后掠机翼层流流动的特点和已有的经验提出了自然层流机翼的设计准则，用本文的三维机翼设计方法设计了一个跨音速自然层流机翼。

In airplane design, structural nonlinearities cannot be avoided. The structuralnonlinearities arise from worn hinges of control surfaces, loose control linkages,material behavior and various other sources. In the flighting, the aerodynamicnonlinearities also cannot be avoided. The aerodynamic nonlinearities can benegligible when the speed of the plan is not very high;but when the speed of the planis supersonic or highly supersonic, it cannot be negligible.

在飞机设计中，结构非线性是不可避免的，结构非线性源于控制其表面的旧铰链，松散的控制器联动装置，材料性能和其它的来源；在飞机的飞行中，气动的非线性也是不可避免的，对于飞行速度不是很高的情况，气动的非线性是可以忽略的，而对于超音速以及超高音速的飞机来说，气动的非线性是不可以忽略的。

The isentropic efficiency of the optimum design has 1.59% higher than that of the reference design.

完成了小展弦比跨音速透平级的气动优化设计。

Thermal cracking and catalytic cracking of lab prepared endothermic hydrocarbon fuel NNJ 150 over USHY, HZSM 5 and SAPO 34 catalysts were studied.

吸热型碳氢燃料是为解决高超音速飞行器的冷却问题而立题研究的。

In this paper, The delta wing of Mach number 0.8 at an attack angle of 21. 8 degree is simulated by our program. Then, using the visualizing program, we map the figures of space streamlines, cross streamlines near the vortex axis, three dimensional vortex lines, cloud atlas for pressure and vortex and targer of particles.

在这一章里，我们先用所建立的计算软件数值模拟了来流马赫数为0.8、攻角为21.8°的三角翼的流场，之后以拓扑分析结果做指导，研制了一套数值显示流场、旋涡结构的软件，用该软件我们绘制了跨音速三角翼背风区涡轴附近截面流线、空间流线、三维涡量线、压力和涡量云图以及粒子屏痕图。

A design for an advanced body shape for transonic flow is one of the key problems in research, in and out of China.

跨音速先进气动外形的设计是国内外研究人员都十分重视的问题之一。

A design for an advanced body shape for transonic flow is one of the key problems in research, in and out of Chin...

跨音速先进气动外形的设计是国内外研究人员都十分重视的问题之一。

A study on the effects of aspect ratio is presented for a transonic fan by numerical method.

摘 要：使用数值模拟方法，对比研究了三个采用不同大小动叶展弦比设计得到的高负荷跨音速风扇的性能。

An effective aerodynamic optimization design method of transonic airfoil is given.

提出了一种有效的跨音速翼型气动优化设计方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。