Planar Doppler Velocimetry for Aircraft Exhausts

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$149,868.00
Award Year:
2011
Program:
STTR
Phase:
Phase I
Contract:
N68335-11-C-0435
Agency Tracking Number:
N11A-004-0265
Solicitation Year:
2011
Solicitation Topic Code:
N11A-T004
Solicitation Number:
2011.A
Small Business Information
MetroLaser, Inc.
CA, Irvine, CA, 92618-2008
Hubzone Owned:
N
Socially and Economically Disadvantaged:
Y
Woman Owned:
N
Duns:
188465819
Principal Investigator:
Thomas Jenkins
Senior Scientist
(949) 553-0688
tjenkins@metrolaserinc.com
Business Contact:
Cecil Hess
President
(949) 553-0688
cecilh@metrolaserinc.com
Research Institution:
Georgia Institute of Technology
R. P Hart, Esq.
Office of Sponsored Research
505 Tenth Street, NW
Atlanta, GA, 30332-0150
(404) 894-6929
Nonprofit college or university
Abstract
A diagnostic is proposed for aircraft engine exhausts that provides three velocity components at each point in an image of a slice through the plume. The method measures the Doppler shift of laser light scattered from soot particles naturally present in the exhaust, and may also be useful for measuring non-combustion flows outside the exhaust using naturally occurring environmental aerosols. An image processing filter that employs iodine vapor absorption transforms frequency variations in the scattered light to variations in image intensity. The technique can provide two-dimensional instantaneous velocity profiles over an area large enough to cover the cross-section of a typical aircraft engine exhaust. A laser system that is insensitive to vibration effects makes it suitable for field measurements on a full-scale aircraft. Velocity uncertainties are dependent on signal level, and thus on the level of soot particles present in the flow. However, the method should be capable of operating over a large range of particle loading levels and is capable of measuring supersonic as well as subsonic velocities.

* information listed above is at the time of submission.

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