亚声速

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。

Numerical experiments,including supersonic flow,subsonic flow and low speed flow,show that the al...

验证算例包括超声速、亚声速以及极低速情形的化学反应流场，计算结果表明基于预处理AUSM+格式发展的算法能够有效地用于全速域范围内化学反应流动问题的模拟。

With the bell-type soliton movement in supersonic speed and the kink-type soliton movement in subsonic speed the two types of the soliton bound states appear to situate at the bottom and the top of the exciton energy band respectively.

对Bell一型孤子以亚声速＜运动，而Kink一型孤子以超声速运动，它们分别出现在激子能带底部和顶部。

Infrared radiation features of water jet were extracted in two and three dimensional configuration.

现代高压水射流技术的喷嘴直径一般在2mm以下，最小可达到0.2mm左右，流速为高亚声速至高超声速。

A multiminate layer vapor screen technique and force measurement technique for an unsteady flow in the intermitted wind tunnel is presented in this paper.

本文介绍在暂冲式三声速风洞中实现了非定常流动的多片光蒸汽屏显示技术和测力技术，并用这两项技术研究了亚声速时70°后掠三角翼模型俯仰振动的非定常流动现象，探讨了由于三角翼模型俯仰振动产生的涡结构与纵向气动力特性之间的相关关

An air-breathing valveless PDE model was designed and manufactured,which was made up of subsonic inlet,mixing chamber,ignition chamber,detonation chamber and nozzle.

设计制造了完整的吸气式无阀脉冲爆震模型机，包括亚声速进气道，混合室，点火室，爆震室和喷管。

Finally, the pressure become very high immediately and a unstart phenomena appears.

当马赫数减小到一定数值时，在等直隔离段入口出现喉道截面，进一步减小来流马赫数，流量队塞，引起压力升高，波系向进口方向移动，波后出现亚声速流场，进气道不起动。

This paper presents the diagnosed results for argon nitronitrogen mixture jet as the second part for spectroscopic diagnosis method on non equilibrium arc boated jet .

本文是非平衡电弧加热射流光谱学诊断方法实验研究工作的第二部分，给出了氩，氮混合射流的结果，证明亚声速射流中确有非平衡囊兜现象存在

The W-shaped tailless aircraft has not stabilizer and vertical tail,and it is based on the design of forward-swept wing and the integrated design of blended wing-fuselage.

W型无尾飞机基于前掠翼及翼身融合的一体化设计，取消了平尾和垂尾，可大幅降低雷达反射截面积，减轻结构重量；同时具有亚声速气动效率高、横航向操纵面效率高的优势。

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。