Study of the near-wake structure of asubsonic base cavity flowfield using PIV

M. J. Molezzi; J. C. Dutton

doi:10.2514/6.1993-3040

Study of the near-wake structure of asubsonic base cavity flowfield using PIV

M. J. Molezzi, J. C. Dutton

Aerospace Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

A new particle image velocimetry (PIV) system has been used to study the near-wake structure of a two dimensional base in subsonic flow in order to determine the fluid dynamic mechanisms of observed base drag reduction in the presence of a base cavity. Experiments were done over a range of freestream Mach numbers up to 0.8, including local flowfield velocities over 300 m/s. Effects of the base cavity on the von Kármán vortex street wake were found to be related to the expansion and diffusion of vortices near the cavity, although the effects are of small magnitude and no significant change in the vortex formation location or path was observed. The base cavity effects are also less significant at higher freestream velocities due to the formation of vortices further downstream from the base. The base cavity drag reduction was found to be mainly due to the displacement of the base surface to a location upstream of the low-pressure wake vortices, with only a slight modification in the vortex street itself.

Original language	English (US)
DOIs	https://doi.org/10.2514/6.1993-3040
State	Published - 1993
Event	AIAA 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993 - Orlando, United States Duration: Jul 6 1993 → Jul 9 1993

Other

Other	AIAA 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993
Country/Territory	United States
City	Orlando
Period	7/6/93 → 7/9/93

ASJC Scopus subject areas

Aerospace Engineering
Condensed Matter Physics
Electrical and Electronic Engineering
Engineering (miscellaneous)

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10.2514/6.1993-3040

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title = "Study of the near-wake structure of asubsonic base cavity flowfield using PIV",

abstract = "A new particle image velocimetry (PIV) system has been used to study the near-wake structure of a two dimensional base in subsonic flow in order to determine the fluid dynamic mechanisms of observed base drag reduction in the presence of a base cavity. Experiments were done over a range of freestream Mach numbers up to 0.8, including local flowfield velocities over 300 m/s. Effects of the base cavity on the von K{\'a}rm{\'a}n vortex street wake were found to be related to the expansion and diffusion of vortices near the cavity, although the effects are of small magnitude and no significant change in the vortex formation location or path was observed. The base cavity effects are also less significant at higher freestream velocities due to the formation of vortices further downstream from the base. The base cavity drag reduction was found to be mainly due to the displacement of the base surface to a location upstream of the low-pressure wake vortices, with only a slight modification in the vortex street itself.",

author = "Molezzi, {M. J.} and Dutton, {J. C.}",

note = "Funding Information: Acknowledgement. This work (2010-0027654) was supported by Mid-career Researcher Program through NRF grant funded by the MEST. Publisher Copyright: {\textcopyright} 1993 American Institute of Aeronautics and Aerodynamics, Inc. All rights reserved.; AIAA 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993 ; Conference date: 06-07-1993 Through 09-07-1993",

year = "1993",

doi = "10.2514/6.1993-3040",

language = "English (US)",

}

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T1 - Study of the near-wake structure of asubsonic base cavity flowfield using PIV

AU - Molezzi, M. J.

AU - Dutton, J. C.

N1 - Funding Information: Acknowledgement. This work (2010-0027654) was supported by Mid-career Researcher Program through NRF grant funded by the MEST. Publisher Copyright: © 1993 American Institute of Aeronautics and Aerodynamics, Inc. All rights reserved.

PY - 1993

Y1 - 1993

N2 - A new particle image velocimetry (PIV) system has been used to study the near-wake structure of a two dimensional base in subsonic flow in order to determine the fluid dynamic mechanisms of observed base drag reduction in the presence of a base cavity. Experiments were done over a range of freestream Mach numbers up to 0.8, including local flowfield velocities over 300 m/s. Effects of the base cavity on the von Kármán vortex street wake were found to be related to the expansion and diffusion of vortices near the cavity, although the effects are of small magnitude and no significant change in the vortex formation location or path was observed. The base cavity effects are also less significant at higher freestream velocities due to the formation of vortices further downstream from the base. The base cavity drag reduction was found to be mainly due to the displacement of the base surface to a location upstream of the low-pressure wake vortices, with only a slight modification in the vortex street itself.

AB - A new particle image velocimetry (PIV) system has been used to study the near-wake structure of a two dimensional base in subsonic flow in order to determine the fluid dynamic mechanisms of observed base drag reduction in the presence of a base cavity. Experiments were done over a range of freestream Mach numbers up to 0.8, including local flowfield velocities over 300 m/s. Effects of the base cavity on the von Kármán vortex street wake were found to be related to the expansion and diffusion of vortices near the cavity, although the effects are of small magnitude and no significant change in the vortex formation location or path was observed. The base cavity effects are also less significant at higher freestream velocities due to the formation of vortices further downstream from the base. The base cavity drag reduction was found to be mainly due to the displacement of the base surface to a location upstream of the low-pressure wake vortices, with only a slight modification in the vortex street itself.

UR - http://www.scopus.com/inward/record.url?scp=85006371360&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006371360&partnerID=8YFLogxK

U2 - 10.2514/6.1993-3040

DO - 10.2514/6.1993-3040

M3 - Paper

AN - SCOPUS:85006371360

T2 - AIAA 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993

Y2 - 6 July 1993 through 9 July 1993

ER -

Study of the near-wake structure of asubsonic base cavity flowfield using PIV

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