NASA SBIR 2008 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER: 08-1 A2.03-9848
SUBTOPIC TITLE: Aero-Acoustics
PROPOSAL TITLE: Numerical and Physical Modeling of the Response of Resonator Liners to intense Sound and High Speed Grazing Flow

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Hersh Acoustical Engineering Inc
22305 Cairnloch Street
CALABASAS, CA 91302 - 5875
(818) 224-4699

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Alan S. Hersh
haeash@charter.net
22305 Cairnloch Street
CALABASAS, CA 91302 - 5875
(818) 224-4699

Expected Technology Readiness Level (TRL) upon completion of contract: 1 to 2

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
An innovative research program is proposed that numerically and physically models the response of resonator liners to intense sound and high speed grazing flow. The research program is divided into two parts. Part 1 addresses the feasibility of performing direct numerical simulation (DNS) of the sound and flow fields of the following: (i) one-slit and two-slit resonators in a normal incidence impedance tube, (ii) adjust and modify the computational algorithm and mesh design to allow the code to perform high temperature simulations, and (iii) use the simulation codes to initiate a study of the performance of high temperature liners. Part 2 develops the following: (iv) a grazing flow multi-slit orifice resonator impedance model, (v) a grazing flow 1-dof multi-circular orifice resonator impedance model and (vi) a 2-dof non-grazing flow multi-circular orifice resonator impedance model. The research program was motivated, in part, by high oil prices that place ever greater demands upon the near-term need to provide aircraft engine acoustic engineers with reasonably accurate tools to design optimized liners and the long-term need to develop sophisticated computational codes to provide physical understanding of the interaction between incident intense sound and grazing flow on resonator liners

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
The resonator liner software can be used to design efficient sound absorbing liners that are lightweight, fuel efficient and operate with low static pressure losses for manufacturers of aircraft engine nacelles.

The control of engine noise in the community surrounding commercial airports is known to be a difficult problem to solve given the cost, weight, safety and fuel cost constraints of the aircraft industry.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
The resonator liner software can be used to design efficient sound absorbing liners that operate with low static pressue losses for manufactures of HVAC duct noise suppressors, space heaters and air conditioners.

NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.

TECHNOLOGY TAXONOMY MAPPING
Aircraft Engines


Form Generated on 11-24-08 11:56