声速

The effect of low Reynolds number on the flow instability mechanism of transonic compressor was studied numerically.

数值模拟了低雷诺数下跨声速压气机设计转速下内部流场特性。

The precision of the traditional ultrasonic localization method is limited due to unsufficiently precise estimation of the sound velocity and the time of flight, therefore, a new method, the special fusion method for redundancy ultrasonic information was proposed to solve the precision problem.

针对常规的超声波定位方法存在对决定定位精度的声速与渡越时间估算不准，导致定位精度有限的问题，提出了一种新的超声波绝对定位方法，即冗余超声波信息特殊融合法。

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。

The second part of this paper presents a CFD-simulation of the performance of straight-walled and curved-walled micro nozzle/diffuser by FLUENT software. Such nozzle/diffusers are mainly used in micro venturi and also applied to valveless micropumps.

而在速度分布部分，当流量为5.338 mg/min时，宽度为150微米的喉部区流速已经高於声速，随后因速度不断增加，空气黏滞力影响了速度分布而产生了速度冲击现象。

To research the ways of relieving inlet unstart phenomenon, the flow of a typical hypersonic 2-D inlet with different suction positions was analyzed in this paper.

对某典型二元高超声速进气道流场进行了二维数值模拟，研究了抽吸位置及抽吸流量对进气道性能的影响。

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。

The results for the distributions of species, temperature, pressure and other parameters are obtained. In addition, the mixing process of atomized kerosene injected transversely into the supersonic flow with hydrogen pilot flame has also been calculated.

本文还对具有氢引导火焰的煤油雾化颗粒在超声速气流中的混合流场进行了的数值模拟，为进一步的两相超燃的数值模拟打下了基础。

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

It was just as I had conjectured.

第一次测量声速是在什么时候？

This is the first step for H〓 pilot flame igniting the combustible, two phase flow of hydrocarbon.

目的是为了弄清燃料的混合机理，为以后两相超声速燃烧的数值模拟打下基础。

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。