Practical Assessment of Noise/Performance Trade for High NPR Nozzles

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-09-C-0394
Agency Tracking Number: N073-173-0208
Amount: $999,145.00
Phase: Phase II
Program: SBIR
Awards Year: 2009
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
 Principle Engineering Sci
 (651) 220-1290
Business Contact
 Peter Giese
Title: Director, Marketing & Sal
Phone: (651) 220-1129
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. Phase I demonstrated that noise measurement can be conducted simultaneously with performance measurement in a thrust stand using a near field microphone array. Phase will focus on demonstrating that the near field acoustic measurement can be extrapolated to the far field using acoustic holography in the forward flight environment. Near field and far field measurements will be conducted simultaneously in high quality jet noise facility to demonstrate that the extrapolation process can provide sufficient detail for design purposes. This will allow future programs to be conducted with confidence with just the near field array in the thrust stand.

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

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