You are here

Planar Doppler Velocimetry for Aircraft Exhausts

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-13-C-0232
Agency Tracking Number: N11A-004-0265
Amount: $749,934.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: N11A-T004
Solicitation Number: 2011.1
Solicitation Year: 2011
Award Year: 2013
Award Start Date (Proposal Award Date): 2013-04-22
Award End Date (Contract End Date): 2016-05-16
Small Business Information
8 Chrysler
Irvine, CA 92618
United States
DUNS: 000000000
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: Yes
Principal Investigator
 Thomas Jenkins
 Senior Scientist
 (949) 553-0688
Business Contact
 Cecil Hess
Title: President
Phone: (949) 553-0688
Research Institution
 Georgia Tech Research Corporation
 Joel Kennedy
Georgia Institute of Technolog 505 Tenth Street
Atlanta, GA 30332-0420
United States

 (404) 385-6697
 Nonprofit College or University

A diagnostic is being developed for aircraft engine exhausts that measures three velocity components in a slice through the plume. The method measures the Doppler shift of laser light scattered from particles naturally present in the flow, such as soot or dust. Two key areas of uncertainty were investigated in the Phase I study: 1) scattered light intensity from soot particles of sizes and concentrations that are representative of jet exhaust flows, and 2) image registration limitations that determine how accurately Doppler images can be normalized by reference images. Predictions were performed using a mathematical model that showed signal levels would be high enough in a typical aircraft engine exhaust to enable single shot measurements with uncertainties as low as 2 m/s. Experiments were conducted using a soot generator that showed uncertainties in Doppler shifts corresponding to about 6 m/s. Planned improvements in image registration should lead to even lower uncertainties. Photon fluxes were measured in a small turbojet engine, and were found to be on the same order of those measured in the soot generator. Scattering from dust was observed in regions outside the plume that may provide an opportunity for velocity measurements in these regions as well.

* Information listed above is at the time of submission. *

US Flag An Official Website of the United States Government