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THE CALCULATION OF THE density field FROM AXISYMMETRIC SCHLIEREN INTERFEROGRAMS BY THE IMAGE PROCESSING TECHNIQUES

Acta Mechanica Sinica 1993年第1期9卷 22-26页

作者：姜宗林刘杰克倪刚陈耀松 Mechanics Department Peking University Beijing China 100871 Beijing Institute of Aerodynamics Beijing China 100074

The schlieren interferograms used to be analyzed in a qualitative way. In this paper, by means of the powerful computational ability and the large memory of computer; the image processing method is investigated for the digitalization of an axisymmetric schlieren interferogram and the determination of the density field. This method includes the 2-D low-pass filtering, the thinning of interferometric fringes, the extraction of physical information and the numerical integration of the density field. The image processing results show that the accuracy of the quantitative analysis of the schlieren interferogram can be improved and a lot of time can be saved in dealing with optical experimental results. Therefore, the algorithm used here is useful and efficient.

关键词： flow visualization schlieren interferogram image processing density field

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density distribution in a heavy-medium cyclone

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Mining Science and Technology 2011年第2期21卷 175-179页

作者： Wang Yuling Zhao Yuemin Yang Jianguo School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221008 China

Heavy-medium cyclones are widely used to upgrade run-of-mine *** the understanding of flow in a cyclone containing a dense medium is still *** introducing turbulent diffusion into calculations of centrifugal settling a theoretical distribution function giving the density field can be *** analysis of the density field in every part of a cylindrical cyclone suggests an optimum design that has exhibited good separation effectiveness and anti-wear performance when in commercial operation.

关键词： Heavy-medium cyclone density field density flow model Optimization

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Equivalent lenses of supersonic seeker's outflow refractive index field obtained by simulation and experiment

Equivalent lenses of supersonic seeker's outflow refractive ...

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2008 International Conference on Optical Instruments and Technology

作者： Qun WEI~(*a,b),Hongguang JIA~a,Ming XUAN~a a Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130033,China b Graduate University of Chinese Academy of Sciences,Beijing 100039,China

In order to decrease the aerodynamic drag of supersonic image guide missile and design a non-spherical dome,the outflow field of the missile’s dome is simulated using *** on the simulated results,the accurate density field of the outflow field at all kinds of flight conditions is obtained,and then the refractive index field of the outflow field is gotten according to the Gladstone-Dale *** results show that the shock wave induces the heterogeneity of the refractive index field and the turbulent causes *** outflow field is divided into several zones which are taken as equivalent lenses for aberration analysis.

关键词： outflow field refractive index field dome density field FLUENT equivalent lens

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