音速

Locked himself in his room and built a sonic death ray.

sonic：音波的，音速的 ray：光束，光线把自己锁在屋里做了个音速死亡放射线仪。

Taking the continuity equation of air-powder flow into consideration, the apparent sonic velocity of two-phase flow can be given.

考虑两相流连续方程确定出两相流的实际表观音速，并且与两相平衡流理论计算所得的理论音速进行了比较，仅为其0.5~0.7倍。

Hypersonic aircraft refers to the speed of sound, at least 5 times more than the aircraft.

高超音速飞机是指超过音速至少5倍的飞机。

In order to grasp the hypersonic vehicle models complex dynamic characteristics,a new hypersonic vehicle model method was proposed.

为了掌握高超音速飞机复杂的动态特性，提出了一种研究高超音速飞机模型的新方法。

In the computation of aerodynamic forces, the present work is based on the work of Morino et al., but the following aspects are improved:(1) In computing the steady transonic aerodynamic load, the steady transonic nonlinear integral equation is solved by relaxation-iteration method in this thesis, instead of solving the time dependent transonic nonlinear integral equation, so that the computing time is saved greatly;(2) The influence coeifficients represented by volume integral are transformed to surface integral by using the Gaussian Theorem, so the analytical form of these coeifficients can be obtained and this leads to be more convenient to analyse and compile computer program;(3) The shock capturing method is used in every time step in present work, no shock moving term is added in the integral equation, so that it is more convenient and simpler to treat.

在气动力计算方面，本文基于Morino等人的工作，作了如下几方面的改进：（1）在计算定常跨音速流场（作为非定常绕流计算的初场）时，本文采用松驰迭代法直接求解跨音速定常非线性积分方程，而不是采用时间相关法求解非定常非线性积分方程，这样大大节省了计算机时；（2）将以体积分形式出现的影响系数化为面积分，并获得解析公式，这样便于分析和编写程序；（3）对运动的激波，本文通过在每一个时间步长上采用激波捕捉法而得到，而不是在积分方程中附加激波运动项，因而处理起来简单方便得多。

In this thesis, we apply the equations of motion of steady Mach reflections and the oblique shock theory to derive polynomial expressions of the forms of f(r,Mo,P1) of downstream sonic and strong/weak separating conditions of reflected shocks of perfect-gas steady Mach reflections. We then obtain polynomial expressions of the forms of f(r,M0) for the limiting Mach angle condition of the above two expressions.

本论文首先应用稳态马赫反射流场运动方程式及斜震波关系式，推导出理想气体稳态马赫反射流场之反射震波下游之音速条件与反射震波之强弱分界条件之曲线解公式，并应用该曲线解公式来推导反射震波俱音速性质於Mach angle条件及反射震波俱强弱分界性质於Mach angle条件之公式。

The scramjet, which is the propulsion of hypersonic vehicle, has become the focus in many military developed countries.

高超音速飞行器的动力装置一超音速燃烧冲压发动机的研究已成为当前各军事强国研究的热点。

Of, relating to, or capable of speed equal to or exceeding five times the speed of sound .

超波音速的等于或超过音速五倍的速度的，与这种速度有关的，或能达到这速度的

Parameters, a new method was developed with the relationships of the second virial coefficient , the second acoustical virial coefficient and the intermolecular potential function.

利用工质的音速与第二维里系数的关系，推导出第二音速维里系数与分子间势能函数的关系式，提出了一种新的拟合分子间势能模型参数方法。

The free water in wood is very closely related to the density change of wood during drying, so that the sound speed measured by tap tone completely obeys the physical law relating sound speed and properties of solid materials. 2. When moisture contents are higher than the fiber saturation point, the weight changes or the moisture content changes of the wood can be estimated with high accuracy by measuring the changes of sound speed using the tap tone method.

试验结果显示：木材中之自由水分在打音时完全表现在生材之密度变化上，因此打音音速完全遵守音速与材质关系之基本物理定律，故在含水率高於纤维饱和点之生材状态，利用音速变化来推定木材重量变化或含水率变化具有相当高的精度，是合理可行的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。