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Precursor Detection of Combustion Instability

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-04-M-0118
Agency Tracking Number: N041-126-0198
Amount: $69,998.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N04-126
Solicitation Number: 2004.1
Solicitation Year: 2004
Award Year: 2004
Award Start Date (Proposal Award Date): 2004-04-05
Award End Date (Contract End Date): 2004-10-05
Small Business Information
10070 Barnes Canyon Road
San Diego, CA 92121
United States
DUNS: 107928806
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Michael Larsen
 Reseaech Engineer
 (858) 535-9680
Business Contact
 Richard Miller
Title: Division Manager
Phone: (858) 535-9680
Research Institution

Combustor blowout instability develops under lean operating conditions displaying complex, low frequency thermo-acoustic fluctuations. In thermal pulse combustors, these oscillations can become chaotic. Detecting these changes in combustion dynamics prior to blowout has the potential to yield useful monitoring information and feedback for active control of instability. As the fuel/air ratio at which blowout occurs is uncertain, understanding how these precursors to combustion instability change with fuel composition, ambient conditions, pulsation amplitude, and combustor age is of fundamental performance. The traditional approach taken by combustor designers is to build sufficient margin into the design to prevent blowout under worst case operating conditions. Rather than suppress or avoid possible nonlinear behavior, we will investigate the possibility of exploiting the nonlinear nature of the combustion around blowout to reduce operating margins while maintaining stability or extend the limit of lean operability. Recent advances in nonlinear dynamics have led to the development of analysis techniques that are useful for gaining insight into the behavior of complex physical processes. These techniques will be used to analyze acoustic, chemiluminescence, and temperature oscillations measured in a thermal pulse combustor and identify precursors of combustion instability. Precursors would be identified by searching for qualitative changes in statistical behavior of combustion dynamics reconstructed from experimental data using time delay embedding. Nonlinear signal processing technique suitable for nonlinear and nonstationary processes will also be used to isolate intermittent and transient precursor signals in noise.

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

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