USA flag logo/image

An Official Website of the United States Government

Passive Combustion Control Device for Noise Reduction and Improved Life in…

Award Information

Department of Defense
Award ID:
Program Year/Program:
2007 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
12173 Montague Street Pacoima, CA 91331-2210
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2007
Title: Passive Combustion Control Device for Noise Reduction and Improved Life in Turbine Engines
Agency / Branch: DOD / NAVY
Contract: N00014-07-M-0015
Award Amount: $100,000.00


To reduce combustion instability and noise in turbine engines, Ultramet will team with the University of Alabama to design, model, fabricate, and test refractory hafnium carbide/silicon carbide open-cell ceramic foam to be used in the combustion chamber as a passive control device. Previous work at the University of Alabama utilized Ultramet's open-cell silicon carbide foam as a porous insert medium burner for lean premixed combustion to reduce pollutant emissions. When combustion took place inside the foam, nitrogen oxide and carbon monoxide emissions were greatly reduced; temperature across the test burner was homogenized; and the noise level inside the combustor was drastically reduced. However, the lifetime of the silicon carbide foam burner was limited because of the relatively low melting point of the silicon dioxide protective layer that forms at the surface. The proposed ceramic alloy foam is protected from oxidation by a much more refractory surface oxide, hafnium silicate, which offers a nominally 1000 degrees F higher use temperature. The ceramic alloy also has improved survivability in combustion environments containing a significant quantity of water vapor. Two approaches using open-cell foam as a passive control device will be explored. In the first, the foam will be located downstream of the reaction zone to dissipate the combustion noise and/or instability generated upstream. In the second, the vortex shedding mechanism of combustion instability will be curtailed by placing foam within the recirculation region of the reaction zone.

Principal Investigator:

Timothy R. Stewart
Research Engineer

Business Contact:

Craig N. Ward
Engineering Administrativ
Small Business Information at Submission:

12173 Montague Street Pacoima, CA 91331

EIN/Tax ID: 952662293
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No