查询词典 Mach

For gas flow past cylinder, the characters of flow field in different Mach number and Knudsen number condition were investigated, and especially for low Knudsen number cases, the results were compared with calculating results of Euler's equation. It showed that they are correspondent by comparing the characters of bow shock and wake. The convergence rates of different high resolution and implicit schemes were also investigated. The convergence behavior of the implicit WENO scheme developed in this paper is better than others. For gas flow past NACA 0012 airfoil, the calculating results were compared with results of experiment. It showed that the results of WENO scheme are of higher accuracy for the case with angle of attack.

在圆柱流场时，我们探讨不同马赫数且不同纽森数时的流场特性，并在低纽森数时，与那维尔-史托克方程式的计算结果比较，我们比较了弓形震波及尾流附近的特性，其结果是相当符合的，同时我们也比较不同高解析隐式算则的收敛历程，从收敛历程图可得到，本文发展出来的隐式WENO算则有较佳的收敛效果；在NACA 0012翼形的流场中，我们将与实验结果做比较，发现利用WENO算则计算的结果，对於具有攻角的流场，亦有相当高的准确度。

In a steady internal flow the Mach number can only reach 1 at a minimum in the cross-sectional area.

在一个稳定的内部流动马赫数只能达到一在最低限度，在截面积。

The Concorde's delta wing made the plane's sustained cruising speed of Mach 2 possible.

协和飞机的三角翼飞机作出的持续巡航速度2马赫的可能。

Capable of Mach 2.35, it has variable sweep wings which can be set to 16 degrees of sweep during takeoff and landing, 72 degrees for high speed flight, and 45 degrees for mid-range operation; the dogtooth you can see in the outer wing section fits in to the inner wing section when in the 16 degree position.

他能够达到2.35马赫，拥有可变后掠翼，在起飞和降落的时候保持16度，高速飞行保持72度，中距离任务保持45度。外部的机翼尖端在16度时恰好能嵌入机翼内段。

Such a larger collection is certainly implied in the words II Mach., ii, 13, and the prologue of Ecclesiasticus.

这样一个较大的收藏当然是隐含在词二马赫。

Mach-Zehnder Optical fiber space interferometer is an optical instrument in which the traditional optical interferometer arms are substituted by two fibers. It uses a visible light, and the interference of beams from fibers will be observed in the screen.

光纤Mach-Zehnder干涉仪是利用光纤代替常规M-Z干涉仪传输光路的一种仪器，使用在可见波段，由光纤出射的光在空间进行干涉，在干涉屏上出现可见的干涉条纹。

At first, numerical simulation are made on the temporal developing gas-phase mixing layer where the convective mach number is in the region of subsonic(0.5) and transonic(0.8). For the temporal problem where Mc is 0.5, researches where the computational field contains different numbers of initial disturbances(so-called n period problem) are made respectively, and vortex's types of evolution in mixing layer including different numbers of initial disturbances are investigated; For the temporal problem where Mc is 0.8, the distinct shock let structure is obtained, and its mechanism is analyzed at the same time.

文中首先对对流马赫数为亚声速(0.5)、跨声速(0.8)的时间发展单气相混合层作了数值研究，对Mc为亚声速单气相时间发展混合层，分别研究了计算域包含不同数目的初始扰动周期问题，考查了不同周期数的混合层中涡的不同演化方式；对Mc为跨声速的单气相时间发展混合层，得到了清晰的小激波结构，同时分析了小激波的形成机理。

The results show that the flow-field boundary augments with increase of flight altitude at the same flight Mach number and the same mass flow rate, and augments with the increase of mass flow rate at the same flight. At the same time, the combustion gas injection flow-field structures change greatly with the variety of flight status parameters.

结果表明，在发动机排气质量流率相同的情况下，高空时燃气射流流场的边界比低空大；相同飞行高度时，随着发动机排气质量流率的增加，燃气射流流场边界随之增大，同时射流流场的结构也有很大的不同。

The Mach number in the outlet of the choke is calculated,and the flowage can be decided.

计算出口处的马赫数的值，判别节流嘴内的流态，进而逆向求节流嘴上游的各参数。

The design point (Ma=4.5) is the optimization basis for the waverider forebody, and the problem of the best flow turning angle under various flight Mach numbers is comprehensively taken into consideration.

乘波体前体以设计点（Ma=4.5）为优化基础，综合考虑在各个飞行马赫数下的最佳气流转角问题。

World War II: Battle of Saipan - Americans take Saipan.

1944年的今天，美国在塞班战役中拿下塞班岛。

When the scorner, the rejecter of truth, has become presumptuous; when the routine of work in the various money-making lines is carried on without regard to principle; when the student is eagerly seeking knowledge of everything but his Bible, Christ comes as a thief.{DA 635.3

当讥诮和拒绝真理的人，到了任意妄为时，当追求财利者罔顾按道义经营谋利时，当学人正在兢兢业业地研究各种知识，而单把圣经丢在一边时，基督要像贼一样来临。