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transition length
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  转捩区长度
     The author modified the Abu-Ghannam and Shaw Transition Model (AGS Transition Model) with ready test data,set out the concept of calculating the transition length with arc Reynolds number and compared the calculated value with the test value.
     本文作者利用现有的试验数据对Abu -GhannamandShaw〔1〕转捩模型 (AGS转捩模型 )进行了修正 ,提出了利用弧长雷诺数模型确定转捩区长度的思想 ,并对计算结果与试验值进行了比较
短句来源
  过渡段长度
     THE CALCULATION OF THE DEEP-TROUGH BELT CONVEYOR TRANSITION LENGTH
     深槽型胶带输送机过渡段长度的计算
短句来源
     Through the forming analysis of the deep-trough belt conveyor transition section, this paper gives the calculating method of the transition length according to the allowable belt strain and specific elongation.
     通过对深槽型胶带输送机过渡段的成形分析,结合胶带允许伸长率和许用应变,推导出过渡段长度的计算公式。
短句来源
     Computation of Transition Length of Offshore Buried Double-layer Pipeline
     浅海埋地双层管道过渡段长度的计算
短句来源
     Calculating belt-conveyor transition length and determining the roller space
     带式输送机过渡段长度计算及过渡托辊间距的确定
短句来源
     Considering double-layer structure adopted commonly in marine pipeline at present, the transition length of double-layer pipeline is calculated by integral equivalent method in this paper, and calculating equation of transition length is deduced according to the above method.
     考虑到目前浅海海底管道大多采用双层管结构,提出用整体等效法计算双层管结构过渡段的长度,并根据这种方法推导了过渡段长度的计算公式。
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  “transition length”译为未确定词的双语例句
     The theory and method of waves generated by serpent-type wavemakers are described in this paper. The transition length in front of the wave boards is determined by experiments. The properties of the generated waves are studied experimentally and the results of the regular waves are compared with the theoretical values.
     本文叙述了分段式造波机生成波的理论和方法,通过试验确定了造波板前过渡段的长度,研究了分段式造波机生成波浪的特性,并将规则波的试验结果与理论结果进行了比较,给出了有效实验区的范围,可供实际应用时参考。
短句来源
     AN APPROXIMATION OF THE TRANSITION LENGTH FOR LAMINAR FLOW BETWEEN TWO PARALLEL PLATES
     流體在二平行平板間作層流運動時轉化長度的近似計算
短句来源
     For T dies, the effects of the transition length and the number of manifold on exit uniform thickness and flow rate are taken into account.
     对T型机头,考虑了过渡区长度和增加歧管数量对出口均一和流量的影响。
短句来源
     The distance from the entrance required for practically complete transition has been calculated by Boussiuesq and olso by Schiller, and formulas for calculating tle transition length have been proposed.
     由進口處至完全轉化成抛物線形流速分佈所需的距離曾先後經鮑辛尼斯克(Boussinesq)和錫拉(Schiller)進行過研究,他們求得了計算此轉化長度的公式。
短句来源
     An attempt is thus made, in this paper, to calculate this lenqth by applying Schiller's theory; and the result obtained is given by L=0.0259bR in which L is the transition length, b is half the distance between the plates and R is the Reynolds number.
     爲此本文應用錫拉理論對此進行了計算,求得了此轉化長度的公式爲L=0.0259bR,式中,L爲轉化長度,R爲雷諾數,b爲二平板間的距離之半。
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  transition length
Moreover, transition length is correlated with a shape parameter.
      
Small fatigue cracks (≈30-Μm long) were naturally initiated from smooth specimens and grown past the transition length (≈200 Μm), where they exhibited the characteristics of large fatigue cracks.
      
The influence of the transition decreases with decreasing transition length and increasing ratio of the maximum radius to the minimum radius of the transition.
      
The influence of a mechanical obstacle placed at the end of the transition zone on the stabilization of the detonation starting point and the shortening of the transition length is investigated.
      
The transition length for the cases of the plate-wake were shorter than those for the cases of the cylinder-wake as well as the uniform flow.
      
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It has long been realised that for laminar flow through a circuclar pipe, the Poiseulle's velocity distribution exits only at a sufficient distance downstream from the entrance to the pipe. For a well-rounded entrance, the velocily distribution at the entrance is approximately uniform, it then varies gradually with the distance from the entrance until the parabolic distribution is fully developed. The distance from the entrance required for practically complete transition has been calculated by Boussiuesq and...

It has long been realised that for laminar flow through a circuclar pipe, the Poiseulle's velocity distribution exits only at a sufficient distance downstream from the entrance to the pipe. For a well-rounded entrance, the velocily distribution at the entrance is approximately uniform, it then varies gradually with the distance from the entrance until the parabolic distribution is fully developed. The distance from the entrance required for practically complete transition has been calculated by Boussiuesq and olso by Schiller, and formulas for calculating tle transition length have been proposed. For laminar flow between parallel plates, however, no information for the length of transition appears to be available. An attempt is thus made, in this paper, to calculate this lenqth by applying Schiller's theory; and the result obtained is given by L=0.0259bR in which L is the transition length, b is half the distance between the plates and R is the Reynolds number.

我們很早就知道流體在圓管中作層流運動時,泊西里(Poiseulle)的流速分佈只是在距進口處相當長的一段距離處才能實現。如管子進口是圓滑的,則在進口處斷面上的流速是均匀分佈的,此後流速分佈即逐漸轉變直至抛物線形的流速分佈完全形成爲止。由進口處至完全轉化成抛物線形流速分佈所需的距離曾先後經鮑辛尼斯克(Boussinesq)和錫拉(Schiller)進行過研究,他們求得了計算此轉化長度的公式。但是對於在二平行平板間的層流運動,其轉化長度的計算尚無公式可資利用。爲此本文應用錫拉理論對此進行了計算,求得了此轉化長度的公式爲L=0.0259bR,式中,L爲轉化長度,R爲雷諾數,b爲二平板間的距離之半。

A novel finline transition structure is presented in this paper. The basic configuration takes the form of a wedge-shaped notch cut in the finline substrate along the finline longitudinal axis. The wedge-shaped notch together with the finline taper provides a impedance match between the air-filled waveguide and finline. The optimal depths of the wedge-shaped notch for different tapered transition lengths have been determined by trial and error. About a 10-dB improvement in return loss has been obtained...

A novel finline transition structure is presented in this paper. The basic configuration takes the form of a wedge-shaped notch cut in the finline substrate along the finline longitudinal axis. The wedge-shaped notch together with the finline taper provides a impedance match between the air-filled waveguide and finline. The optimal depths of the wedge-shaped notch for different tapered transition lengths have been determined by trial and error. About a 10-dB improvement in return loss has been obtained over most of the X-band as compared with the ordinary tapered transition structure.

本文提出了一种新型鳍线过渡段结构。这种结构是沿鳍线纵向轴线在基片上切一楔形凹槽,该凹槽与金属鳍渐变段一起提供空气填充波导和鳍线之间的阻抗匹配。对于不同渐变过渡段长度,其最佳楔形凹槽深度由实验试凑法得到。与普通渐变过渡段结构相比较,在X波段的大部分范围内,这种新型结构可使回波衰耗降低约10分贝。

Several problems involved in the prediction of heat transfer coefficient on the turbine blade profiles without film cooling are studied in this paper for the purpose of improving the accuracy.These problems are:heat transfer in the vicinity of stagnation point,the location of boundary layer transition,heat transfer of transitional boundary layer and the influence of free stream turbulence intensity.Cebeci Smith method is used to solve the ...

Several problems involved in the prediction of heat transfer coefficient on the turbine blade profiles without film cooling are studied in this paper for the purpose of improving the accuracy.These problems are:heat transfer in the vicinity of stagnation point,the location of boundary layer transition,heat transfer of transitional boundary layer and the influence of free stream turbulence intensity.Cebeci Smith method is used to solve the boundary layer equations obtaining the similar solution in the vicinity of stagnation point.It is assumed that the free stream velocities near the leading edge of a blade can approximately be expressed as that for a cylinder,the radius of which equals to that of leading edge circle or to the radius of a“equivalent cylinder”,the solution obtained by this method in the vicinity of stagnation point is used as a initial profiles of velocity and enthalpy for the computation of boundary layer along the blade surface.STANS [9] with some modifications is used to calculate heat transfer coefficient on the rest part of the blade surface.Transition origin and transition length are predicted by using the models suggested by Seyb [5] and Dhawn at el. [12] respectively.In order to take the free stream turbulence intensities into account,a turbulence viscosity is introdued as a part of effective viscosity of the fluid.Several numerical examples obtained by the proposed method in this paper indicate better agreement with the experimental data than by original STAN 5.

本文用数值方法计算了无气膜冷却涡轮叶片上包括前驻点的整个型面上的换热系数。驻点区采用相似方程计算 ,并用圆柱绕流近似表示驻点附近流场。较成功地模拟了边界层转捩和过渡区的换热情况。计算中考虑了来流湍流度的影响。所计算的三种涡轮叶型在不同工况下的换热系数与实验结果符合较好

 
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