音速

The speed of propagation for mechanical waves, the speed of sound , is defined by the mechanical properties of the medium.

速度传播的机械波，音速，是由机械性能的介质。

Concorde flies at twice the speed of sound.

空客的飞行速度是音速的两倍。

"Plateau Eagle" advanced trainer adopts the aerodynamic arrangement of double delta wings with high lift-drag ratio, the leading edge of outside wing rotated conically and air inlet beneath both sides ribs, and has a good take-off/landing performance and subsonic/transonic speed performance in medium-low altitude.

"山鹰"高级教练机采用高升阻比双三角机翼气动布局，外翼前缘锥形扭转以及两侧肋下进气道，具有良好的起降性能和中低空亚跨音速性能。

The Conservator's Sonic Pulse Battery is ideally suited for dog fighting enemy aircraft.

管理员的音速脉冲密集炮是近乎理想的空中缠斗武器。

Deflagration is combustion wave propagating at a velocity less than the speed of sound.

爆燃过程是一种以低于音速而传播的燃烧波。

Two forms of implicit TVD schemes are proposed in this paper for the simulation of nonequilibrium flows past hypersonic re entry vehicle, which are derived from the diagonal form of an approximate factorization algorithm and lower upper scheme applied to the implicit part of Harten Yee's TVD scheme respectively.

针对高超音速化学非平衡流提出了两种隐式格式。一种是近似因子分解算法对角化形式在隐式TVD格式上的推广，另一种可视为隐式TVD格式的LU分解形式。

And with this method, an implicit difference equation for solving the unsteady transonic flow with Euler equations is established.

在此基础上建立了可用于跨音速非定常流动的Euler方程隐式求解法。

In this paper,the transonic two dimensional airfoil integral equation given by Nixon [1,2,3] has been extended to three dimensional thin wing case.

本文将Nixon[1，2，3]对二维薄翼型所建立的跨音速积分方程推广到三维薄机翼情况。

Through solving the Navier-Stokes equation, three dimensional transonic unsteady flow in isolated rotor blade was simulated.

本文通过数值求解Navier-Stokes方程，计算了跨音速压气机转子叶排内三维非定常粘性流动。

Using the directional derivative formula, the governing equation is discreted in the physical domain in which a nonorthogonal grid system is used. Two kinds of AF2 schemes, i. e. AF2-plane relaxation and full implicit AF2, for the TSD equation are proposed. Numerical results show that the full implicit AF2 scheme converges faster than AF2plane relaxation scheme. For the rectangular wing and swept wing, the results of the present method are compared with FP results, and the agreement is good.

采用适合于梯形机翼和后掠机翼的斜网格，利用方向导数公式直接在物理空间对主管方程进行离散；将近似因式分解方法应用于绕机翼的跨音速小扰动势流问题，提出AF2—面松弛和AF2全隐式两种迭代格式，并对它们的收敛速度进行比较，结果表明后者明显快于前者；直机翼和后掠机翼的算例表明，本文方法的结果与精确势流方法的结果吻合良好。

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。