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  detonation wave
An evaluation formula of the detonation wave pressure in the system of laser, energy transferring-medium and sheet metal is built according to the theory of detonation wave and blasting gas-dynamics.
      
Two methods were used to determine the induction length of two-phase detonation wave through the pressure history.
      
Transition of plane overdriven detonation wave to the Chapman-Jouguet regime
      
The solution of the problem for the case in which the thickness of the heat release zone is neglected (the infinitely thin detonation wave model) was obtained in [1-3].
      
Study of the attenuation of a detonation wave with a two-front structure by the boundary (shock) layer method
      
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  detonation
An evaluation formula of the detonation wave pressure in the system of laser, energy transferring-medium and sheet metal is built according to the theory of detonation wave and blasting gas-dynamics.
      
multicycle pulse detonation engine (PDE) model, and liquid fuel (gasoline) was used.
      
The average of pressure peak, as measured by piezoelectricity pressure transducer, increased versus distance to thrust wall before fully-developed detonation came into being.
      
According to the pressure history, the pressure in detonation tube would not rise abruptly until the flame front advanced a certain distance downstream the spark.
      
One was enforced by combustion and became detonation rapidly.
      
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  detonation waves
Inhibition of stationary detonation waves in hydrogen-air mixtures
      
In recent years considerable interest has developed in the problems of steady-state supersonic flow of a mixture of gases about bodies with the formation of detonation waves and slow combustion fronts.
      
The recently initiated study of steady-state supersonic flows of combustible gaseous mixtures with the occurrence of detonation waves and slow-combustion fronts is the result of several factors.
      
We shall consider the problem of fuel combustion in a supersonic stream, and also the utilization of stationary detonation waves for certain processes in chemical technology and for the study of the kinetics of chemical reactions at high temperature.
      
Relaxation of overdriven detonation waves with finite reaction rate
      
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  gaseous detonation
Initiation of Gaseous Detonation by a Traveling Forced Ignition Pulse
      
Initiation of gaseous detonation in tubes with sharp U-bends
      
The computational analysis included the interactions of the gaseous detonation products and the sand ejecta with the vehicle and the transient non-linear dynamics response of the vehicle.
      
They are governed neither by diffusion of matter or heat (as in combustion processes) nor by a travelling shock wave (as in gaseous detonation).
      
The concept of a shock tunnel with gaseous detonation driver is discussed.
      
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  其他


Steady slant shock wave polar carves and related rarefraction wave relations are given.On the basis of the figures of refractive shock waves in gases and above mentioned relations,the author calculated the problems of refractive detonation waves on the surfaces between condensed explosives and typical five metals and alloy-W,steel,Al,Al-Mg alloy and Be.Various figures of normal and anorraalous refraction are discussed and resultant curves are drawn.

本文中给出了定常斜冲击波极曲线及相应的稀疏波关系式。利用这些关系式并根据气体中冲击波折射图象,计算了凝聚炸药中的爆轰波在钨、钢、铝-镁合金和铍等五种具有代表性的金属表面上的折射问题。讨论了各种正规折射以及非正规折射的图象并给出了结果曲线。

critical detonation stability for two-dimensional perturbations is discus-ed by meansof thermodynamic theory of dissipative structures and perturbs tion method.Except viscosity,transport properties (such as heat conduction,diffusion,radiation etc.) are neglected.The stability criteria of detonation combustion zones is given for viscid fluids and inviscid fluids respectively.We use Arrhenius reaction rate law and consider exothermic chemical reactions.The rate increases when the temperature raises.In the case...

critical detonation stability for two-dimensional perturbations is discus-ed by meansof thermodynamic theory of dissipative structures and perturbs tion method.Except viscosity,transport properties (such as heat conduction,diffusion,radiation etc.) are neglected.The stability criteria of detonation combustion zones is given for viscid fluids and inviscid fluids respectively.We use Arrhenius reaction rate law and consider exothermic chemical reactions.The rate increases when the temperature raises.In the case without viscosity,when activation energy E is greater than a certain critical value EC,the critical detonation is unstable for the two-dimensional perturbations.The amplitudes grow exponentially in the detonation reaction zone until perturbations leave the reaction zone for the region of detonation products.When we consider viscosity effects,the variations of the perturbation amplitudes depend upon the frequences of the perturbation.When reaction activation energy is greater than the critical value EC,and chemical reactionenergy released exceeds the critical value Qc,the less frequence of perturbation (the longer wavelength of perturbation) is,the faster the amplitude increases.Then,the longest perturbation may cover the others,in other words,only longest perturbation wavelength can remain its amplitude unchanged or growed.Finally,it will develop and form a regular spining detonation wave.When the small influences of chemical reaction and viscosity on perturbation phase velocity are neglected,the results obtained here are in agreement with the results of acoustic theory worked by N.Monson and J.A.Fay,and may explain some experimental phenomena of spin detonation successfully.

本文应用耗散结构热力学理论和微扰的方法,研究临界爆轰波对二维扰动的稳定性问题。在忽略粘性、热传导、浓度扩散、外力和交叉效应的情况下,作出了扰动在爆轰波结构内传播的稳定性判据。对Arrhenius反应率,当化学反应活化能E大于某一临界值E_c之后,对反应率随温度增加而增加的放热反应,临界爆轰波对二维扰动是不稳定的,扰动的振幅在反应燃烧区内随时间的增加而增长,直至扰动最后离开爆轰波结构进入波后产物区。当考虑了粘性的影响之后,扰动振幅的增长和衰减依赖于扰动本身的频率,在反应放热量超过某临界值后,频率愈小亦即扰动波长愈长的扰动振幅,随时间增长愈快,以致最长波长的扰动增长掩盖了其它波长的扰动,或者只有最长波长的扰动振幅维持不变,其它波长的扰动振幅都逐渐衰减,最后形成有规则的螺旋爆轰波。所得结果当忽略化学反应以及粘性对扰动传播相速度的微小影响之后,结论与N.Monson和J.A.Fay等所作的声波理论结果相一致,比较成功地解释了螺旋爆轰的一些实验现象。

In numerical modeling of steady detonation,generally an artificial visi-cosity and a function of initiation is introduced . The problem of an artificial structure of detonation due to the addition of the artificial visicosity and function of initiation is discussed .Some exam ples of calculated detonation structures are illustrated.

稳定爆轰波数值模拟时,常引入人工粘性和点火函数,文中讨论了由于加入人工粘性和点火函数引起的爆轰波结构问题,计算了几种爆轰波的结构作为例子。

 
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