查询词典 vortex sheet

Secondly, conception of vortex board was introduced, the numerical simulation was implemented on vortex tube, numerical simulation method was verified of valid by compared with experiment results.

其次，引入涡流板概念，对涡流管进行数值模拟，对比数值模拟和试验结果，验证了数值模拟方法的可靠性。

Corresponding to simulation results, middle flow shows more regular because vortex separation from upstream tube bundles suppress the vortex generation in downstream.

由于多个拟序的涡结构在下游不断的相互作用使得尾迹中的涡结构越来越混乱。

Author analysis the theory of the refrigerating of vortex tube, and give the idea of industry cooling using vortex tube, just because abundant compressed air can be provided in industrialization manufacture.

正因为如此涡流管在科学研究和工业的很多部门具有广阔的实际应用前景。

Jet aircraft, including the vortex theory of jet and fan jet vortex.

喷气式飞机，包括涡论喷气式和涡论风扇喷气式飞机。

Based on theory analysis and numerical calculations, some valuable conclusions are put forward, and some problems in early investigations are found out. Therefore, the results enrich the helical vortex theory and also clear the way from the helical vortex theory to its engineering application.

通过本文的理论分析和数值计算，获得了一系列有价值的研究结果，完善了螺旋涡理论，奠定了该理论工程应用基础，同时发现并解决了早期研究中存在的若干问题。

As mentioned above, by systematic research on helical vortex theory in the present paper, the primary theory with features of static state, single filament and core radius vanished have been developed into new one with motion, multi-vortex and finite-core.

在本文应用研究中，给出了三个实际工程流场解析解和数值计算结果，这些结果在进一步分析装置中的螺旋涡形成机理、分析被诱导流场的进出口边界条件、指导转轮叶片的优化设计、达到产生或消除螺旋涡目的等方面都具有重要意义。

In an admirable error bound, the numerical simulation had the close results with experiment by the characteristic curve of cold mass flow fraction, as well as Thermodynamics model of vortex tube, So Thermodynamic theory hypothesis was available to explain Ranque-Hilsch effect of vortex tube.

在误差允许的范围内，涡流管冷流率特征曲线描述的结果与涡流管热力学理论给出的结果非常相近，说明涡流管热力学理论假设能够描述Ranque-Hilsch效应。

In present paper a three-dimensional discrete vortex filament method is put forward to simulate the motion and bubble entrainment of an inviscid,incompressible vortex ring .

本文发展了三维离散涡模型用于模拟无粘不可压缩涡环的发展及其与气泡的相互作用，涡环被离散为平均分布在其中心线上的球形涡元，由Biot-Sarvart定律叠加每个涡元的诱导速度得到涡环的运动速度。

The numerical results were in good agreement with the measured results. The experimental and numerical results show that the vortex ring was induced by baroclinic effect and Helmholtz instability in the vicinity of the thruster exit after the donation wave exhausted the tube. The intensity, shape and location of the suspended shock varied when the shape of the vortex ring changed.

爆轰波溢出爆轰管后，斜压效应和Helmholtz不稳定导致涡环的产生，同时在流场中形成止于涡环的悬吊激波，涡环形状的变化又引起悬吊激波的强度、形状和位置的变化。

The analysis shows that with given grid size higher accurate difference scheme can give higher resolutions with wider range of scales, or with given accuracy large grid size can be used for the higher accurate difference scheme. The second part is the numerical simulation of two-dimensional axisymmetric jet. The simulation results show the structure in the near field and the initial transition. In the near field, Kelvin-Helmholtz instability leads to the formation of vortex ring, and nonlinear growth leads to the merging of vortex ring. This is the main instability form. Under the assumption of axisymmetry and two-dimensional computing conditions, the results are applicable only in the near field.

第二部分采用高精度的差分格式对二维轴对称射流进行了数值模拟，模拟结果显示了射流流场结构和涡结构的发展过程，在射流流场近区，K-H失稳导致涡环的产生以及非线性效应的增长导致涡环的对并是射流失稳的主要形式；分析指出在轴对称假设下的射流数值模拟只适用于射流近区的分析。

My father is over 60 years old, and he lifts weights every day.

我爸爸六十多岁了，他每天都练习举重。

Then in a serious tone she declared:"It doesn't pay, dear boy, to look like a ninny with one's wife the first night."

两眼湿润了，她把身子蜷得很小，这样似乎可以更好地闻闻自己。