Development of High Frequency Excitation Devices for Noise Reduction

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$69,976.00
Award Year:
2003
Program:
SBIR
Phase:
Phase I
Contract:
NAS1-03015
Agency Tracking Number:
022728
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Innovative Technology Applications Co.
P.O. Box 6971, Chesterfield, MO, 63006
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Alan Cain
Principal Investigator
(314) 576-1639
ITACabc@aol.com
Business Contact:
Alan Cain
Business Official
(314) 576-1639
ITACabc@aol.com
Research Institution:
n/a
Abstract
The noise level of new and existing aircraft need to be reduced to meet the increasingly stringent US and international airport standards. High frequency excitation (wavelengths much shorter that amplified instabilities) of jet flows is a new technology that has the potential to reduce acoustic levels significantly in addition to lowering turbulence levels. In application, forcing is applied at frequencies that are much higher than ones associated with the large-scale, two-dimensional structures associated with the jet, but much lower than the Kolmogorov scale. The development of the jet is substantially altered through two mechanisms. First, the high-frequency forcing increases the turbulent dissipation rate. Second, it reduces the turbulent production. These two mechanisms together lead to a significant decrease in the energy in the large-scale two-dimensional motion and subsequently lowering turbulent and noise levels. One benefit of the control is that the forcing needs only to possess frequencies that are above a certain range. This single frequency requirement encompasses a wide array of potentially suitable devices.

* information listed above is at the time of submission.

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