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Floquet instability of a large density ratio liquid-gas coaxial jet with periodic fluctuation

Applied Mathematics and Mechanics(English Edition) 2008年第8期29卷 975-984页

作者：李振胡国辉周哲玮 Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering Shanghai University

By numerical simulation of basic flow, this paper extends Floquet stability analysis of interracial flow with periodic fluctuation into large density ratio range. stability of a liquid aluminum jet in a coaxial nitrogen stream with velocity fluctuation is investigated by Chebyshev collocation method and the Floquet theory. Parametric resonance of the jet and the influences of different physical parameters on the instability are discussed. The results show qualitative agreement with the available experimental data.

关键词： jet stability Chebyshev collocation Floquet theory parametric resonance large density ratio

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A STUDY ON THE FLOW BEHAVIOR OF AN AXISYMMETRIC LAMINAR jet

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Journal of Hydrodynamics 1993年第3期5卷 112-115页

作者： Chen Yuan Supervisor Prof.Lin Tong-ji,E Xue-quan Institute of Mechanics,Chinese Academy of Sciences,Beijing 100080,P.R.China

It is of great practical and theoretical importance to study the properties and flow behavior of laminar jet,because it tightly links the physical phenomena of nonlinerity such as flow stability and transition and so ***,many problems and differences exist in ba- sic concepts and in understanding of stable and transitional properties and flow patterns of ax- isymmetric laminar ***,a further study on this subject is needed to evaluate the exist- ing understandings and to find out the mechanism governing the behavior of actual axisymmetric laminar jet flow. In this thesis,the flow behavior of axisymmetric laminar jet issuing from nozzles of several diameters in the direction of gravity was studied experimentally using flow visualization tech- nique in the range of Reynolds number from tens to *** unstable and transitional processes in the laminar jet were *** influence on the jet flow of different geometry contours of jet chamber boundary was *** new flow phenomena were discovered which gave deeper understanding of flow patterns and their dependent factors in low Reynolds number axisymmetric laminar jet.A theoretical model to describe the variation of the axisym- metric laminar jet length influenced by the weak density difference is proposed based on the ex- perimental observation,which will be helpful in recognizing the flow behavior of axisymmetric laminar jet of low Reynolds numbers.

关键词： axisymmetric laminar jet jet stability flow visualization

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