图书馆订阅: Guest
机械过程图像显示

每年出版 4 

ISSN 在线: 2152-209X

INFLUENCE OF INITIAL CONDITIONS AT THE NOZZLE EXIT AND ACOUSTICAL ACTION ON THE STRUCTURE AND STABILITY OF A PLANE JET

卷 2, 册 3, 2012,
DOI: 10.1615/VisMechProc.2013005162
Get accessGet access

摘要

The results of experimental investigations of the influence of the initial conditions at the nozzle exit and acoustical action on the structure of a plane jet, the characteristics of its evolution and stability are presented in this work. Peculiarities of the development of laminar and turbulent plane jets are shown for the same Reynolds number. Patterns of smoke visualization of the jet upon variation of the initial conditions of jet formation and acoustical action, and during the interaction of streaky structures with vortices of the laminar plane jet vortex street are discussed. Laminar and turbulent jets at the exit of a two-dimensional Hagen–Poiseuille channel are found to experience longitudinal sinusoidal oscillatory motion considered as a whole. Peculiarities of evolution of both laminar and turbulent jets under acoustical action are revealed. It is found that the generated symmetrical mode of instability of a laminar plane jet is suppressed by the asymmetrical mode of instability. The interaction of the streaky structures, generated on one side of a plane nozzle, with the vortices of a laminar plane jet with a parabolic mean velocity profile is shown to lead to the generation of Λ- or Ω-like vortices on both the left and right vortices of the vortex street. The results of the investigations are valid for jet flows with small Reynolds numbers.

Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集 订购及政策 Begell House 联系我们 Language English 中文 Русский Português German French Spain