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射流核心
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  jet core
     According to the analysis of the grinding fluid velocity in the jet core,an engineering formula is given to calculate the position limit of nozzle during quick-point grinding, as well as a practical design example for the experimental grinder.
     通过射流核心区速度的分析,建立了磨削液喷嘴极限位置的工程计算公式,并给出了快速点磨削实验机床磨削液供给参数的设计实例.
短句来源
  “射流核心”译为未确定词的双语例句
     The flow field of free jet was measured by PIV. The instantaneous velocity vectors of the core region of jet was studied experimentally.
     利用PIV技术测量了射流流场,得到了自由射流核心区的瞬时速度场,并对实验结果进行了分析总结。
短句来源
     For air and CO 2 jet flow, the peak of energy spectrum is not discovered until the end of potential core, and the Str number is about 0.41. But for H 2 jet flow, the peak of energy spectrum has been discovered even when x
     空气射流和二氧化碳射流核心区的末端 ,能谱上才出现显著的峰值 ,其Strouhal数约为 0 .41。
短句来源
     According to the norm equation and datum, we regress the formual of jet velocity attenuation in core air stem and the formual of velocity in main air stem.
     由此准则方程及实验数据回归出低温送风空调系统的空气射流核心速度衰减公式 ,总结出主流区的速度分布公式。
短句来源
     With the application of Fluent, the jet flow dynamics of a spray gun is simulated and computed, which concludes that the jet field could be characterized by three regions: the core region, the entrainment region, and the fully turbulent region.
     文中运用 CFD 软件 Fluent,对高速电弧喷枪头部及枪外射流进行了模拟计算,通过分析可以看出,枪外射流可以分为射流核心区、射流卷吸区和射流湍流区。
短句来源
     The results show that with the reduction of nozzle diameter,the speed value of the core section is getting bigger,the scattering angle of jet is getting lower and the focus of jet is getting better.
     研究结果表明:随着喷嘴直径的减小,射流核心段速度值越来越大,射流的散射角越来越小,射流的集束性越来越好。
短句来源
  相似匹配句对
     the core essential factors;
     核心要素;
短句来源
     Core Separator
     核心分离器
短句来源
     Insertion fluidic flowrate meter
     插入式射流流速计
短句来源
     A Study of How the Jet Aeration Works
     射流曝气法研究
短句来源
     It is proved experimentally that there is not a steady, laminar core in the jet.
     实验结果表明,射流中不存在一个稳定的、层流的核心区。
短句来源
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  jet core
The sign of the momentum flux above and below the jet further confirms this, indicating that the group velocity of the generated waves is pointing away from the jet core region.
      
The background rotation also causes the co-spectra of the waves high above the jet core to be asymmetric in the spanwise modes, with contributions from modes with negative wavenumbers dominating the co-spectra.
      
The shadowgraph pictures show that the tabs drastically weaken the shock structure in the jet core and disperse the supersonic zone of the flow making them occupy a greater zone of the flow field compared to the plain nozzle.
      
Isobaric contours reveal that the streamwise vortices cause an inward indentation of the entrained mass into the jet core and an outward ejection of core flow.
      
Coherent streamwise structures were present in the jet core for the lower Reynolds number.
      
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The flow field of air through a simplified model of a vaporizing tube combustor has been measured and investigated, because, to the authors' best knownledge, such research has not been reported in open literature. The model combustor is of such a rectangular cross section that measurements made both by a three-hole probe and by a Laser Doppler Anemometer (LDA) can be carried out conveniently. There are only primary holes on the liner wall so as to simplify the flow pattern which is affected only by the jets...

The flow field of air through a simplified model of a vaporizing tube combustor has been measured and investigated, because, to the authors' best knownledge, such research has not been reported in open literature. The model combustor is of such a rectangular cross section that measurements made both by a three-hole probe and by a Laser Doppler Anemometer (LDA) can be carried out conveniently. There are only primary holes on the liner wall so as to simplify the flow pattern which is affected only by the jets ejected from the vaporizing tubes and from the primary holes. Some of the results obtained are presented in this paper. The principal finding is that the features of the flow pattern that can be clearly seen are as follows: the jets ejected from the tubes decay rapidly in the regions near the front wall of the liner, thus in the primary zone of this type of combustor, the suggestion that some authors have made for describing the flow field as a free jet pattern must be treated very cautiously; the recir- culation zones are formed as a result of the interaction between the primary tube jet entrainments and the secondary hole jet entrainments, and, because of the collision effects of one jet with other jets and/or with the wall, the flow pattern is especially complex; it can be seen that the recirculation zone occupies up to 50-60% of the total primary area in the vertical section passing through the centerline of a vaporizing tube, and the swirling speed of the vortex in the recirculation zone is estimated to be more than 2000 rpm. An important observation can be made from the comparison of measure- ments obtained by the two-dimensional LDA. Since the comparison shows that they are coincident with each other on the whole, it appears to be correct to suggest that a mini three-hole probe can still be employed for measuring even a complex flow field under such particularly restrictive conditions. Some experience in using a three-hole probe to determine the local flow directions is also presented.

本文叙述了利用常规三孔测针对一种矩形截面的模型蒸发管式燃烧室的头部冷态流场所进行的部分实验研究工作。从测得的流谱图中可以发现这类燃烧室火焰筒头部流场具有如下明显特征:蒸发管射流的核心部分在接近前壁时衰减得很快,不能简单地按照自由射流的概念处理;回流区的形成是一次和二次进气射流对周围气体卷吸作用的结果,由于进气射流相互之间和进气射流与壁面之间的碰撞作用,使流场变得十分复杂。文中还对用三孔测针得到的结果和用二维多普勒激光风速仪测得的结果进行了对比,结果表明两者基本一致。可见,在一定条件下,利用三孔测针测量复杂流场仍然是一种可行的手段,并得出了一些有益的使用经验。

With the analye of air-flow pressure distribution measurement and air jet in the air-inner hole of the interlace nozzles. It can be concluded that in the nozzle:the stronger flow makes filaments turn and false-twist texturing and the weaker flow makes filaments forward and form interlace node. The length of the air jet flow is about 4.7 times of the diameter of feeding of air hole. And it can be recommand that the cross section shape of yarn path be peachlike, the diameter of air jet nozzle be the length of...

With the analye of air-flow pressure distribution measurement and air jet in the air-inner hole of the interlace nozzles. It can be concluded that in the nozzle:the stronger flow makes filaments turn and false-twist texturing and the weaker flow makes filaments forward and form interlace node. The length of the air jet flow is about 4.7 times of the diameter of feeding of air hole. And it can be recommand that the cross section shape of yarn path be peachlike, the diameter of air jet nozzle be the length of yarn path be 20~45mm,the tention of yarn in be 10%~20% lower than that of yarn out.

通过网络喷嘴流场测定和进气孔射流的分析,得知在射流区内可分为较强的周向气流速度分量,使丝束假捻,旋转,同时有稍弱的轴向气流速度分量,使丝束前移形成网络结,其射流核心区长度约为进气孔直径的4.7倍。丝道截面形状推荐为桃形,喷嘴进气孔直径一般为1.1~2.2mm,丝道长度一般在20~45mm,丝束张力以进丝张力稍低于出丝张力10%~20%为宜。

The flow field of free jet was measured by PIV. The instantaneous velocity vectors of the core region of jet was studied experimentally. The measurement results in different Reynolds numbers 2300,and 3500 are compared. The thickness of boundary layer is thin and the spanwise size of jet is smaller in the core region of jet at the lower Reynolds number. The growth of thickness of boundary layer obviously depends on the Reynolds number. The spanwise size of jet are more rapidly growing.

利用PIV技术测量了射流流场,得到了自由射流核心区的瞬时速度场,并对实验结果进行了分析总结。比较了射流出口雷诺数分别为2300及3500时流场的实验结果。在低雷诺数情况下,射流的边界层较薄,展向尺寸较小,随着出口雷诺数的增高,射流边界层明显增厚,展向尺寸也更快地增大。

 
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