Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-19T12:39:48.849Z Has data issue: false hasContentIssue false
  • English
  • Français

Instantaneous pressure fields at a corner associated with vortex impingement

Published online by Cambridge University Press:  20 April 2006

Y.-P. Tang  and
D. Rockwell
Y.-P. Tang
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA Present address: Air Products and Chemicals, Inc., Trexlertown, PA.
D. Rockwell
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA
Get access Rights & Permissions [Opens in a new window]

Abstract

The impingement of concentrations of vorticity upon a corner is studied using simultaneous flow visualization and correlation of pressure fluctuations, revealing the relations between the instantaneous pressure fields along the top and front faces of the corner and the instantaneous distortion of the incident vortex.

By varying the transverse offset of the corner relative to the incident vortex, several distinct and consistent patterns of incident vortex–corner interaction are evident. The corresponding form and phasing of the instantaneous pressure fields are strongly dependent upon the nature of the vortex–corner interaction, though the maximum amplitude on the top and front faces is always of the same order. For certain interactions, there is separation of flow from the edge of the corner, as well as from the front face of the corner, leading to secondary-vortex formation and corresponding peaks in the local pressure fields.

By integrating the instantaneous pressure fields along the top and front faces of the corner, the phasing between the respective forces is shown to exhibit varying degrees of dipole-like behaviour, depending upon the character of the incident vortex–corner interaction. Amplitudes of the corresponding moments of the pressure fields are remarkably insensitive to this interaction.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 126 , January 1983 , pp. 187 - 204
Copyright
© 1983 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Conlisk, T. & Rockwell, D. 1981 Modelling of vortex–corner interaction using point vortices Phys. Fluids 24, 2133–2142.Google Scholar
Fuchs, H. V. 1973 Comments on ‘The pressure and velocity fields of convected vortices’. J. Sound Vib. 30, 249–251.Google Scholar
Knisely, C. & Rockwell, D. 1982 Self-sustained low-frequency components in an impinging shear layer J. Fluid Mech. 116, 157–186.Google Scholar
Lau, J. C., Fisher, M. J. & Fuchs, H. V. 1972 The intrinsic structure of turbulent jets J. Sound Vib. 22, 379–406.Google Scholar
Lush, P. A. 1973 The pressure and velocity fields of convected vortices J. Sound Vib. 27, 266–270.Google Scholar
Michalke, A., 1965 On spatially growing disturbances in an inviscid shear layer J. Fluid Mech. 23, 521–544.Google Scholar
Rockwell, D. 1982 Oscillations of impinging shear layers. Invited lecture at A.I.A.A. 20th Aerospace Sciences Meeting, 11–13 January. Available as A.I.A.A. Preprint 82-0047. A.I.A.A. J. (to be published 1983).Google Scholar
Rockwell, D. & Knisely, C. 1979 The organized nature of flow impingement upon a corner J. Fluid Mech. 93, 413–432.Google Scholar
Rogler, H. 1974 A mechanism of vorticity segregation Bull. Am. Phys. Soc., Ser. II, 19, 1165.Google Scholar
Rogler, H. 1978 The interaction between vortex-array representations of free-stream turbulence and semi-infinite flat plates J. Fluid Mech. 87, 583–606.Google Scholar
Roshko, A. 1976 Structure of turbulent shear flows: a new look. A.I.A.A. J. 14, 1349–1357.Google Scholar
Tang, Y.-P. 1981 Correlation of pressure fluctuations at an impingement corner due to vortex–corner interaction. M.S. thesis, Department of Mechanical Engineering and Mechanics, Lehigh University.
Ziada, S. & Rockwell, D. 1982 Vortex–leading-edge interaction J. Fluid Mech. 118, 79–107.Google Scholar