捩转

As is well known, the problem of laminar-turbulent transition in a boundary layer is very important from practical application point of view.

从层流到湍流的转捩问题有很重要的应用背景。

At appropriate conditions they can also give quantitative information of the surface boundary layer transition position.

红外热像仪技术和液晶显示技术研究在应用时受到环境条件的影响，在合适的条件下也能给出模型表面边界层转捩位置的定量结果。

The transition process for oscillating circular cylinder is also simulated.

对振动圆柱尾流的转捩过程也作了数值模拟。

This paper presents a numerical simulation and study of the transition to chaos of the flow past a two-dimensional circular cylinder.

本文数值模拟并研究了二维圆柱绕流向混沌转捩的情形。

The fast Fourier transform and wavelet transformation were used to process the experimental data in a transitional boundary layer.

引言平板边界层转捩研究一直受到人们的广泛关注，关注的焦点之一是如何从低频演化到高频。

The improved e-N method can also yield results well agree with those obtained by DNS.4 The transition prediction for boundary layers on cones with different key parameters such as angle of attack, cone half angle and the Mach number of the coming flow, have been made, to show the reliability of the modified e-N method.5 For the calculation of base flow, boundary layer equations can be used in the case of small angle of attack.

但是它要依赖于对初始扰动的正确预估，这显然又取决于更多飞行数据的积累和分析。e-N方法的转捩预测结果与直接数值模拟得到的结果也吻合较好。4通过对不同来流攻角、不同半锥角和不同马赫数的三维圆锥边界层的转捩位置进行预测，证实了改进的e-N方法对于三维边界层转捩预测是可靠的。5对于基本流的计算，边界层方程可以用于小攻角的情况，其计算量远远小于直接数值模拟，但背风面的剖面不可靠。

A new idea of using the parabolized stability equation method to predict the laminar- turbulent transition is proposed.

提出了用抛物化稳定性方程预测层流－湍流转捩的一种新的概念。

Firstly, stability of a hypersonic boundary layer on a blunt cone with small nose bluntness at zero angle of attack has been investigated and the transition location was predicted by the e-N method.

本文研究零攻角和小攻角、超音速和高超音速、尖锥和小钝头锥边界层的转捩预测问题。

For the boundary layer with adiabatic wall, transition happens about 60% further downstream from the nose of the cone, as compared with boundary layer with isothermal wall.2 ZARF is not unique in three-dimensional boundary layer.

壁面温度边界条件对转捩影响很大，绝热边界层和等温边界层相比，转捩位置靠后将近60%。2三维边界层中的ZARF曲线不是唯一的。

Finally, be based on mode of Gao-Yong compressible onflow the mechanism with agglutinant onflow of each opposite sex, preliminary put forward a kind to forecast turn turn the method of position of rest.

最后，基于Gao-Yong可压缩湍流模式各项异性湍流粘性的机理，初步提出一种猜测转捩起始位置的方法。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。