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MIXING ENHANCEMENT NEAR SCRAMJET FLAME HOLDERS

Award Information

Agency:
Department of Defense
Branch:
Air Force
Award ID:
5855
Program Year/Program:
1988 / SBIR
Agency Tracking Number:
5855
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Flow Research Inc
21414 - 68th Avenue South Kent, WA 98032
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Woman-Owned: No
Minority-Owned: Yes
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1988
Title: MIXING ENHANCEMENT NEAR SCRAMJET FLAME HOLDERS
Agency / Branch: DOD / USAF
Contract: N/A
Award Amount: $490,000.00
 

Abstract:

THE UNSTEADY FLOW PHENOMENA AROUND REALISTIC SCRAMJET FLAME HOLDERS WILL BE STUDIED USING AN EFFICIENT TIME-ACCURATE NUMERICAL SCHEME. NUMERICAL SIMULATION OF A SUBSONIC RAMJET HAS SHOWN AN INTERACTION BETWEEN THE LARGE-SCALE VORTICES AND ACOUSTIC WAVES AT A CHARACTERISTIC NONACOUSTIC EIGENFREQUENCY. IN SUPERSONIC RAMJETS, ACOUSTIC WAVES WILL PROPAGATE UPSTREAM ONLY THROUGH THE SUBSONIC RECIRCULATION ZONE AND MAY INTERACT WITH THE SEPARATED SHEAR LAYER, RESULTING IN SIMILAR OSCILLATIONS. THIS ASPECT OF FEEDBACK MECHANISMS WILL BE STUDIED IN DETAIL AS A FUNCTION OF MACH NUMBER IN THE PROPOSED STUDY. THE EXISTENCE OF THIS TYPE OF FEEDBACK HAS IMPORTANT IMPLICATIONS FOR ENHANCING MIXING AND HENCE INCREASING COMBUSTION EFFICIENCY. SPECTRAL ANALYSIS AND CROSS CORRELATION OF THE TIME VARIATION OF THE PRESSURE AND VORTICITY FLUCTUATIONS AT VARIOUS LOCATIONS WILL BE EMPLOYED TO IDENTIFY THE CHARACTERISTIC FREQUENCY OF OSCILLATION AND WAVE PROPAGATION. THE PROPOSED STUDY WILL DETERMINE WHETHER COUPLING BETWEEN ACOUSTICS AND VORTEX MOTION CAN BE SUSTAINED IN THE VICINITY OF A SCRAMJET FLAME HOLDER AND HOW IT IS AFFECTED BY THE MACH NUMBER OF THE FLOW.

Principal Investigator:

Dr Suresh Menon
2068728500

Business Contact:

Small Business Information at Submission:

Flow Research Co
21414 - 68th Ave S Kent, WA 98032

EIN/Tax ID:
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No