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圆柱模型
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  cylinder model
     NUMERICAL STUDY OF ION TRANSPORT IN ECR MICROWAVE PLASMA WITH A CYLINDER MODEL
     圆柱模型下电子回旋共振微波等离子体离子输运过程的数值研究
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     In this paper, using a cylinder model of space charge, the formulae of self-energyand emittance growth for a bunched beam with Gaussian type density distribution inboth ongitudinal and transverse directions in linac are derived.
     采用直线加速器中的空间电荷束团的有限圆柱模型,并假设该有限圆柱体电荷密度分布在横向r和纵向z都满足高期分布,推导得到了该电荷束团的自场能与发射度增长公式;
短句来源
     The solution of the simplified line source model is compared with that of the cylinder model, which demonstrates that the solution of line source model is fine to simulate the heat transfer of the vertical bore in larger Fourier number. But in small Fourier number, it has bigger error comparing with the cylinder model.
     将该解析解与目前常用的线源模型解做了比较 ,指明当傅里叶数较大时 ,线热源的解趋向于圆柱孔的解 ,可以较好的模拟地下传热过程 ,而在傅里叶数较小时 ,线源模型解相比于圆柱模型解 ,有一定的时间延迟 ,误差较大 ;
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  “圆柱模型”译为未确定词的双语例句
     :Detailed heat transfer distributions within a deep g ap were measured with both a sharp leading edge flat plate and a flat cylinder at free stream Ma ch numbers of 9.85,12.0,15.5 and corresponding unit Reynolds numbers of (1.0×10 7,6.4×105,3.2×105)/m in CAS impulse tunnels.
     在脉冲风洞中M∞=9.85,12.0,和15.5,相应雷诺数Re∞=(1.0×107, 6.4×105和3.2×105)/m的来流条件下,分别用平板和平头圆柱模型测量了狭窄缝隙内的详细热流分布。
短句来源
     On these experimental conditions of M_∞=16,P_0=1500Kpa,T_0=923K,α=0°,30°, convective heat-transfer coefficient distributions on lifting body model as well as semisphere-cylinder model were obtained respectively. Infrared experimental data on semisphere-cylinder model was compared with Lees data, which indicated that there was a good agreement between them.
     在M∞=16,P0=1500kPa,T0=923K,α=0°、30°迎角的试验条件下,获得了半球圆柱模型、升力体模型表面对流换热系数分布,并把半球圆柱模型的红外测热结果与Lees分布结果进行了分析比较,结果表明当40°<θ<80°时,半球圆柱模型红外测热结果与Lees分布结果符合得比较好。
短句来源
     Through various correlation analysis between soil moisture content and ma-trix suction on the Flood Plain of the Yellow River,the results indicate thatthe relationship between soil moisture content(θ)and soil matrix suction(ψ)isθ=aψ~(-b)The correlation coefficient is about -0.98.This relationship can be explainedby using the model of soil pore-cylinders.
     对黄泛平原不同质地土壤持水曲线的研究,结果表明,土壤吸力(ψ)与含水量(θ)之间有乘幂关系:θ=aψ~(-b)相关系数为0.98,均高于其它模式。 这种模式可以在理论上用土壤孔隙圆柱模型加以圆满解释.
短句来源
     The flowfield around a hemisp here and a flatnosed cylinder in the shock tube is simulated numerically by using nonequilibrium NavierStokes equations with a n air chemical model of 5 species 17 reactions, and the catalytic rate constant of surface materials such as Pt, SiO2, Ni and a flight vehicle materials is de termined by using the heat transfer rate of testing in the shock tube and the di stribution of heat transfer rate along with the catalytic rate constants.
     用5组分17个化学反应DunnKang空气化学模型和轴对称热化学非平衡NavierStokes方程,对激波管中球头和平头圆柱模型绕流流场进行了数值模拟,给出了驻点热流随催化速率常数变化的分布,并根据激波管实验测量的热流值确定了表面材料Pt、SiO2、Ni和某种飞船材料的催化速率常数,建立了数值分析高焓流动边界层催化特性的软件。
短句来源
     the two-dimensioncylinder model with consideration of radial and axis temperature change is more feasibilitywhen compared with the one-dimension sphere model with consideration of radialtemperature changes;
     考虑径向和轴向温度均变化的二维圆柱模型,比只考虑径向温度变化的球模型更符合实际情况;
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  相似匹配句对
     S. models have been found.
     S.模型
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     Obviously, EVA model turns out a scientific appraisals to motivate the managers.
     该模型为:
短句来源
     A Dynamic Model of Explosive Driving of the Cylindrical Charge
     圆柱装药爆轰驱动的动力学模型
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     Thermal Analysis Models of High Speed Cylindrical Roller Bearing
     高速圆柱滚子轴承的热分析模型
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  cylinder model
The results indicate that cylinder model is preferable to the other two, and epicentroids obtained by the cylinder model separate from the epicenters by a range of 0-40 km.
      
Numerical results are presented for a hollow cylinder model and a membrane with a hole model to validate the proposed DSA method.
      
Electrotonic transients were matched to a somatic shunt equivalent cylinder model adjusted with the generalized correction factor (Fdga) that constrains the parameters for neuronal anatomy.
      
Using a hinged-cylinder model, we can identify the change in rotational diffusion coefficient with a permanent bend of 13-16° per helix turn for the sequences studied.
      
The method was demonstrated by its application to a supersonic flow over a spherically blunted nose cone/cylinder model.
      
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Wind effects on a single cooling tower and a group of towers have been measured in a modelled neutral stratification atmospheric-boundary -layer in a low-speed wind tunnel. Since circumferential pressure distri-butions in the middle part of the cooling tower in the range of ζ = 0.5-0.8 are quite similar, it is reasonable to simulate towers with circular cylinders for studying the mutual interference between them. An incoming flow with strong turbulence is used for simulating the flow in the wall region of the...

Wind effects on a single cooling tower and a group of towers have been measured in a modelled neutral stratification atmospheric-boundary -layer in a low-speed wind tunnel. Since circumferential pressure distri-butions in the middle part of the cooling tower in the range of ζ = 0.5-0.8 are quite similar, it is reasonable to simulate towers with circular cylinders for studying the mutual interference between them. An incoming flow with strong turbulence is used for simulating the flow in the wall region of the neutral stratification atmospheric-boundary-layer, and an incoming flow with weak turbulance for simulating the flow by strong stable stratification. The result of this experiment demonstrates that large eddies in wake of the upstream cylinder generate serious effects on the downstream cylinder in the flow with weak turbulance at the situation of L/D=2-3 and α = 5°-10°, causing the stagnation point of the downstream cylinder a shift to 60° from the leading edge, decreasing the value of the minimum pressure coefficient to a value lower than -1. 75 and switching the negative lift coefficient value a change between 0 to 1.

本实验在1/1000的中性大气边界层模型中系统地测量了在各种状态下的冷却塔和塔群的风荷载。由于冷却塔中间部分(ξ=0.5~0.8)的周向压力分布十分接近,在研究塔群布局时采用圆柱模型:以强湍流度均匀来流来模拟中性大气边界层底部的气流,以弱湍流度均匀来流来模拟强稳定层结时气流中的湍流特性。实验结果表明,当中心距L/D=2~3和方位角α=5°~10°的斜列双柱在弱湍流度均匀来流中时,前柱混合层中的大涡对后柱的压力分布有很大的影响,使后柱驻点偏转60°以上,最小压力系数降到-1.75以下,负升力系数在-1.0左右,风荷载比单柱时有明显的增加。

From the middle sixties, the flow round the body in a density stratified fluid has been intensively studied by experiments. In 1967, Mowbray and Rarity published three schlieren photographs. In these photographs, the vortx structure is invisible. In that period many investigators studied internal waves produced by a horizontally moving body. In 1977, Pao and Kao first reported the closed-end double helical structure of the vortex tube in the wake of a sphere in homogeneous fluid, The phenomenon was revealed...

From the middle sixties, the flow round the body in a density stratified fluid has been intensively studied by experiments. In 1967, Mowbray and Rarity published three schlieren photographs. In these photographs, the vortx structure is invisible. In that period many investigators studied internal waves produced by a horizontally moving body. In 1977, Pao and Kao first reported the closed-end double helical structure of the vortex tube in the wake of a sphere in homogeneous fluid, The phenomenon was revealed by means of a weak stratification for small Richardson number (Ri = 0.215) and Reynolds numbers Re = 4×103 - 2×104. By optical technique Merzkirch and his student obtained clear photographs of wave pattern of internal wave field. Recently, new progresses in studies on the streamsurface bifurcation and vortex skeletons in the three-dimensional separation flow have be made. In order to clarify the vortex structure, the relation between internal waves and vortex in the wake and the mechanism of internal waves, we have built a stratification tank equipment in 1983. In the experiments we detected that for relatively low Reynolds numbers Re = 102 in the flow round a circular cylinder in a stratified fluid the vortices in the wake have a double-helical structure, and two branches of the double helix unwind continuously in an opposite sense from the formation region. This phenomenon is similar to the vortex structure in the wake of the horizontal motion of a sphere, published by Pao and Kao. In case of existence of an inclination, the vortex tube deforms in the motion.We believe that the experimental results may be helpful in studying the phenomena in sheared flow and in understanding the mechanism of production, development and attenuation of turbulence correctly.The cylindrical model used in the experiments was made of stainless steel, 20mm in diameter and 70mm in length, which was hung horizontally to the frame of the stratification tank. The cylinder was set in motion upwards and downwards under the inclination of 45° and 90°.For =0.718 (N is the Vaisala frequency), and Ri =N2D2/V2=2.062.As indicated by Daily and Harleman, there exist molecule diffusion and mass transport in the nonhomogeneous fluids. We shall neglect the end effects. According to our observations and analysis. A density stratified fluid in the wake region may be considered as a mixture of different constituents with different densities. In this way, in the wake region of the stratified fluid, besides the mass transport caused by the local velocity of the mixture- fluid, there exists additional mass transport caused by the relative velocity of different constituents. Due to the buoyancy effect, the fluid particles tend to return to their original equilibrium positions. It may be clearly seen in the experiment that the fluid particles in the wake region are set into oscillations. The oscillations accelerate the dissipation. As the cylinder moves forwards with constant velocity, in the region close to the cylinder, new helical vortices are continuously generated, and the unwound closed end of the vortex tube becomes looser and looser and is continuously dissipated to have a sawtooth boundary, which sets the fluid particles nearby in oscillations affecting the crests and troughs. The propagation of internal waves must satisfy certain dispersion relation which determines the spatial change of the phase. The wave pattern can be experimentally visualized by means of optical technique and theoretically calculated by use of the method of asymptotic expansion. The comparison of the theoretical and experimentalresults was published. The mathematical solution of internal waves in the stretified flow will be published separately.

密度分层流体中物体统流的实验研究从六十年代中期起蓬勃开展起来。在1967年Mowbray和Rarity发表了三张纹影照片,但是没有涉及到尾涡结构。在这期间,不少学者研究了水平运动产生的内波,到了1977年Pao和Kao首先报导了用弱分层的方法揭示了在小Richardson数R_i=0.215和雷诺数Re=4×10~3~2×10~4情况下在均匀流中圆球的尾涡具有封闭末端双螺旋结构。Merzkirch和他的学生用光学技术得到清晰的内波波型照片,对圆柱垂直运动实验和理论结果作了比较。近些年来,稳定性研究和三维分离流动中流面分叉及涡构架研究有新进展。为了搞清楚密度分层流体中的尾涡结构、内波和尾涡的关系、内波产生的机理,在1983年我们建立了分层流水箱设备。从实验中我们发现:在低雷诺数Re≈10~2情况下,分层流体中圆柱绕流的尾涡具有双螺旋结构,双螺旋的二支以相反的方向连续地缠绕在一起。这与Pao和Kao水平运动圆球尾流中涡结构有类似的现象。在有倾角情况下,涡管在运动中发生变形。可以认为,实验结果有助于剪切流动现象的研究以及对湍流的发生、发展和衰变机制的进一步理解。 本实验使用直径D=20mm,长度70mm的不锈钢##...

密度分层流体中物体统流的实验研究从六十年代中期起蓬勃开展起来。在1967年Mowbray和Rarity发表了三张纹影照片,但是没有涉及到尾涡结构。在这期间,不少学者研究了水平运动产生的内波,到了1977年Pao和Kao首先报导了用弱分层的方法揭示了在小Richardson数R_i=0.215和雷诺数Re=4×10~3~2×10~4情况下在均匀流中圆球的尾涡具有封闭末端双螺旋结构。Merzkirch和他的学生用光学技术得到清晰的内波波型照片,对圆柱垂直运动实验和理论结果作了比较。近些年来,稳定性研究和三维分离流动中流面分叉及涡构架研究有新进展。为了搞清楚密度分层流体中的尾涡结构、内波和尾涡的关系、内波产生的机理,在1983年我们建立了分层流水箱设备。从实验中我们发现:在低雷诺数Re≈10~2情况下,分层流体中圆柱绕流的尾涡具有双螺旋结构,双螺旋的二支以相反的方向连续地缠绕在一起。这与Pao和Kao水平运动圆球尾流中涡结构有类似的现象。在有倾角情况下,涡管在运动中发生变形。可以认为,实验结果有助于剪切流动现象的研究以及对湍流的发生、发展和衰变机制的进一步理解。 本实验使用直径D=20mm,长度70mm的不锈钢圆柱模型,该模型水平地悬挂在分层流水箱框架中的带有滚珠轴承滑块上。圆柱与水平轴成45°和90°倾角向上和向下被拖着?

Through various correlation analysis between soil moisture content and ma-trix suction on the Flood Plain of the Yellow River,the results indicate thatthe relationship between soil moisture content(θ)and soil matrix suction(ψ)isθ=aψ~(-b)The correlation coefficient is about -0.98.This relationship can be explainedby using the model of soil pore-cylinders.Soil water retention parametres aand b depend on soil texture,specific surface area and other properties.A increasesand b decreases when soil texture gets clayey.In...

Through various correlation analysis between soil moisture content and ma-trix suction on the Flood Plain of the Yellow River,the results indicate thatthe relationship between soil moisture content(θ)and soil matrix suction(ψ)isθ=aψ~(-b)The correlation coefficient is about -0.98.This relationship can be explainedby using the model of soil pore-cylinders.Soil water retention parametres aand b depend on soil texture,specific surface area and other properties.A increasesand b decreases when soil texture gets clayey.In different soils,the modelof soil specific water capacityC_θ=abψ~(-(b+1)) is about the same at distinct texture soil.The correlation analysis betweenspecific surface area and soil water reteh-tion parametres shows that the te-ndency is the same as that of the texture.The model is also suitable to the soilsin the northeast of China.In mineral soil,the organic matter influencesthe soil water retention by improving the soil structure,not by the waterretention of organic matter itself.In other soils,the model has a strong co-rrelation in low suction of soil.The homogenity analysis in different kindsof soil proves that the influence of soil texture on water retention propertieshas no distinct difference on all kinds of soil.

对黄泛平原不同质地土壤持水曲线的研究,结果表明,土壤吸力(ψ)与含水量(θ)之间有乘幂关系:θ=aψ~(-b)相关系数为0.98,均高于其它模式。这种模式可以在理论上用土壤孔隙圆柱模型加以圆满解释.对不同质地土壤的研究表明模式中的参数a、b 与土壤质地、比表面积等性质有关,a 随土壤质地变细增大,而b 减小,不同质地土壤的比水容量模式为:C_θ=abψ~(?)(b+1)基本趋于一致,并与土壤物理性粘粒含量、比表面积无关,而与土壤中的中粉砂粒含量有一定的相关性.对土壤持水性与表面积的相关性分析,结果与质地有相同的趋势。应用该种模式对东北几种主要土壤验证时发现,该种模式也适用东北地区,同时发现,有机质含量对非原状土测定的土壤持水性影响甚微,说明有机质对土壤持水性的影响只能通过改善土壤的结构状况来表现,不是其本身的亲水性对土壤的影响。对其它土壤的验证还表明,在低吸力范围内该种模式仍具有很强的相关性。对不同土壤类型的同质性分析指出:在各种类型的土壤上,土壤质地对土壤持水性的影响没有显著差异。

 
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