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GENERATION OF AN "ARTIFICIAL" BURST IN A TURBULENT BOUNDARY LAYER

Award Information

Agency:
National Aeronautics and Space Administration
Branch:
N/A
Award ID:
1683
Program Year/Program:
1986 / SBIR
Agency Tracking Number:
1683
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
View profile »
Woman-Owned: No
Minority-Owned: Yes
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1986
Title: GENERATION OF AN "ARTIFICIAL" BURST IN A TURBULENT BOUNDARY LAYER
Agency: NASA
Contract: N/A
Award Amount: $293,562.00
 

Abstract:

IT IS GENERALLY AGREED THAT THE BURSTING PHENOMENON IS THE MOST SIGNIFICANT DYNAMIC EVENT IN A TURBULENT BOUNDARY LAYER. ABOUT 80% OF THE MOMENTUM TRANSFER OCCURS DURING THESE BURSTS. TO REDUCE VISCOUS DRAG, THE PHYSICS AND STRUCTURE OF THESE EVENTS MUST BE FULLY UNDERSTOOD. HOWEVER, PREVIOUS ATTEMPTS TO ACCOMPLISH THIS HAVE BEEN FRUSTRATED BY THE FACT THAT BURSTS OCCUR RANDOMLY IN TIME AND SPACE. IN THE PRESENT STUDY, ARTIFICIAL GENERATION OF A BURSTING EVENT WILL BE ATTEMPTED, THUS CONTROLLING THE TIME AND POSITION OF ITS OCCURRENCE. THE STRUCTURAL DETAILS OF THESE BURSTS WILL BE EDUCED VIA MEASUREMENTS PHASE-LOCKED TO THE ARTIFICIAL EXCITATION. EXPERIMENTS WILL BE CONDUCTED USING A ZERO-PRESSURE GRADIENT BOUNDARY LAYER THAT DEVELOPS ON A FLAT PLATE TOWED IN AN 18-M WATER CHANNEL. FLOW VISUALIZATION AND HOT-FILM MEASUREMENTS WILL BE CONDUCTED TO EDUCE THE TOPOLOGICAL PROPERTIES OF THE ARTIFICIAL BURSTS. THE KNOWLEDGE DEVELOPED THROUGH THIS STUDY MAY PROVIDE A CONCEPTUAL APPROACH TO MODULATING THE FREQUENCY AND STRENGTH OF NATURAL BURSTS, THEREBY REDUCING DRAG.

Principal Investigator:

Mohamed Gad-el-hak
Investigator
0

Business Contact:

Small Business Information at Submission:

Flow Industries Inc.
21414 68th Ave South Kent, WA 98032

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