On the sensitivity of the acoustics of short circular holes to inlet
edge geometries
edge geometries
File(s)
Accepted version
Author(s)
Yang, D
Guzman, Juan
Johnson, Holly
Morgans, Aimee
Type
Conference Paper
Abstract
Short circular holes with a low Mach number mean bias flow passing through them can absorb or generate acoustics. A recent semi-analytical model (Yang & Morgans, Journal of Sound and Vibration, 384 (2016) pp. 294-311 & 393 (2017) pp. 41-61) based on the Green’s function method has been shown to be able to capture both the acoustic absorption and gen-
eration. The model indicates the importance of accurately capturing the path of the shed
vorticity from the hole inlet edge. In the present work, the e
ff
ect of this vorticity path on the
hole acoustics is first studied systematically using the semi-analytical model. As the vorticity
path is sensitive to the sharpness of the hole inlet edge, CFD tools are then used to obtain the
vortex sheet shape after slightly changing the hole inlet edge shape. The acoustic responses of
these modified holes are obtained using the semi-analytical model. A slightly chamfered edge case and a small ellipse edge case are considered to show that a very small change to the shape of the hole inlet edge can give a significant difference in the hole acoustic response.
eration. The model indicates the importance of accurately capturing the path of the shed
vorticity from the hole inlet edge. In the present work, the e
ff
ect of this vorticity path on the
hole acoustics is first studied systematically using the semi-analytical model. As the vorticity
path is sensitive to the sharpness of the hole inlet edge, CFD tools are then used to obtain the
vortex sheet shape after slightly changing the hole inlet edge shape. The acoustic responses of
these modified holes are obtained using the semi-analytical model. A slightly chamfered edge case and a small ellipse edge case are considered to show that a very small change to the shape of the hole inlet edge can give a significant difference in the hole acoustic response.
Date Issued
2018-06-25
Date Acceptance
2018-05-16
Citation
AIAA Aviation Forum, 2018
Publisher
AIAA
Journal / Book Title
AIAA Aviation Forum
Copyright Statement
© 2018 by Dong Yang, Juan Guzmán, Holly G.
Johnson and Aimee S. Morgans. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Johnson and Aimee S. Morgans. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Sponsor
Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Grant Number
FP7 - 305410
EP/P003036/1
Source
AIAA/CEAS Aeroacoustics Conference
Publication Status
Published
Start Date
2018-06-25
Coverage Spatial
Atlanta, Georgia