Practical Assessment of Noise/Performance Trade for High NPR Nozzles

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-08-C-0086
Agency Tracking Number: N073-173-0208
Amount: $137,355.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: N07-173
Solicitation Number: 2007.3
Small Business Information
358 East Fillmore Avenue, St. Paul, MN, 55107
DUNS: 041776824
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dean Long
 Technology Manager
 (651) 220-1290
Business Contact
 Steve Hedberg
Title: CFO
Phone: (651) 220-1222
Research Institution
With improvements in high performance military jet aircraft engines and the increase in complexity of the exhaust systems the noise produced has become problematic. Reducing these noise levels, while maintaining overall system performance, has become the driving issue in new nozzle designs. This proposal will focus on nozzle designs of practical application that can be implemented on current high NPR engine configurations, such as chevrons (or serrations) cut into the trailing edge of the nozzle. In Phase I we will address the practical aspects of making the noise/performance tradeoff for high pressure ratio nozzles. Data will be collected on models in a subscale test facility and evaluated using near field holography and shadowgraph imagery to identify the source characteristics. This will aid development of both CFD and noise prediction algorithms in Phase II.

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

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