the ratio of the speed of a moving body to the speed of sound

the dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and mach number to induced nonlinear characteristics.

采用自由振蕩法数值模拟了平头、钝头外形的超声速俯仰振蕩时间历程，并应用奇异分解线性最小二乘法辨识稳定性导数，得到动导数随马赫数和攻角非线性变化的规律。

the test results showed that the free stream mach number and nozzle pressure rat io getting 100% simulated, the flux coefficient realizing 89% simulated .

试验结果表明：来流马赫数和排气落压比达到1 0 0 %模拟，进气流量系数实现89%的模拟。

c/sic thermal protection scheme works well up to flight mach number not exceeding 8, and only gas jet thermal protection scheme can protect strut leading edge from destruction up to mach 8 and higher.

耐烧蚀材料方案可以在飞行马赫数8以下起到很好的热防护效果；而当马赫数大于8时，则只有气体喷射方案可以实现有效的热防护。

this method is used to design a series of nozzles. their mach number profiles are satisfied for the users.

利用该法设计的一系列喷管，其m数分布满足用户需要。

pilots must therefore ensure that any required corrections to indicated mach are taken into account when complying with the true mach number specified in the atc clearance.

因此，当按照atc许可指定的真马赫数时，飞行员需要对分配到的马赫数修正为指示马赫数。

pressure contours, density contours, mach number contours and pressure coefficient on the cone are obtained. conical shock wave position is geometrically determined.

获得波后流场的等压力线、等密度线、等马赫线和圆锥表面的压力系数，确定了锥激波的几何位置。

speed feedback of yaw angle was realized through adding mode damping ratio of dutch roll and adjusting mach number by height.

偏航角速率反馈以增加荷兰滚模态阻尼比，按高度及马赫数调参数实现。

fl-7 is a continuous transonic wind tunnel, which is powered by three engines. mach number is adjusted by the rotating speed of engines, the flexible wall nozzle and the by-pass valve.

fl-7风洞是以三台航空发动机为动力的跨音速风洞，通过调节发动机转速、柔壁及旁路活门开度来实现对m数的控制。

considering the friction choke phenomenon of gas particle flow, and using mach number checkout method, the critical duct length of gas particle flow in combined duct has been determined.

考虑气粉流摩擦壅塞现象，用马赫数检验法确定了组合管的临界管长。

moreover, the smaller entrance mach number means the better effect of reducing mass of leakage flow;

进口马赫数越小，涡流器对泄漏流量的减小效果越好；

the mach number clicks up real fast even above mach 1.0.

即便在超出1马赫之后马赫数的跳动还是很快。

the results indicate that passive control technique can reduce peak mach number on the surface of the airfoil and reduce the adverse pressure gradient, shock is also weakened.

结果表明，被动控制使得沿模型表面的马赫数峰值及过压力梯度明显减小，激波减弱。

the critical mach number is influenced by the initial pressure and temperature, but the temperature is the main factor.

可燃气体初始温度和压力对起爆临界马赫数都有影响，但是初始温度的影响大得多。

increasing exit flow angle and mach number are two ways to reduce swr.

增加高压转叶出口气流角和马赫数是降低出功比的两条现实途径。

moreover, the law governing the influence of the outlet mach number on the unsteady flow under various modes is found to be not always identical.

且不同模态下出口马赫数对非定常流动的影响规律表现不尽相同。

this paper presents the surface characteristics of the inter-action between shock wave and turbulent boundary layer induced by sharp fin with emphasis on mach number effects.

本文介绍了尖前缘翼诱导激波和湍流边界层干扰流场壁面特性，着重强调马赫数影响。

the results show that the entry vehicle is aerodynamically stable when the mach number is more than1.2.

分析结果表明，在马赫数大于1.2时，探测器处于一个比较稳定的状态。

the results indicate that the inlet mach number and incidence have significant effects on the starting and ending positions of the viscous flow transition.

结果表明：来流马赫数和沖角对转捩起始点和结束点的位置，即转捩所占区域的大小有重要影响。

the investigation indicates that isolator tend to resist higher back pressure and provide exit airflow with better quality under conditions of high mach number and low distortion.

研究结果表明隔离段进口在马赫数高，畸变小的情况下承受反压能力强，流场出口品质好。

results show that the effects of incoming mach number and the nozzle geometry are pronounced, while the jet-momentum ratio has little affects on the gains defined here.

结果表明，马赫数和喷口布局对增益特性均有显着影响，但本文定义的增益因子却基本与动量比无关。

it is necessary to simulate the high enthalpy, high pressure, mach number and the same concentration of oxygen species as air in hypersonic flight.

地面实验设备必须要模拟高超音速飞行状态下气流的焓、压力、m数和空气中氧气的组分。