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Highly-Resolved Wall-Shear-Stress Measurement in High Speed Flows

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-14-C-0060
Agency Tracking Number: F14A-T08-0214
Amount: $149,749.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: AF14-AT08
Solicitation Number: 2014.A
Solicitation Year: 2014
Award Year: 2014
Award Start Date (Proposal Award Date): 2014-09-15
Award End Date (Contract End Date): 2015-06-14
Small Business Information
Gainesville, FL 32652-4061
United States
DUNS: 113641695
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Tai Chen
 Senior Engineer
 (937) 361-7711
Business Contact
 Mark Sheplak
Title: President
Phone: (352) 514-7431
Research Institution
 University of Florida
 Jennifer Curtis
PO Box 115500 219 Grinter Hall
Gainesville, FL 32611-2611
United States

 (352) 392-1582
 Nonprofit College or University

ABSTRACT: The ability to obtain time-resolved, direct wall shear stress measurement is an important asset to aerodynamic research, flow control and to enhance the fundamental understanding of the turbulent boundary layer. Due to a lack of reliable and affordable skin friction sensors, existing indirect methods are used to measure wall shear stress but their usefulness is limited since prior knowledge of the flow is required for indirect sensing. The proposal will result in an instrument-grade, all-sapphire optical miniature sensor to enable mean and fluctuating wall shear stress measurements in high temperature environments. The device must possess sufficient temporal and spatial resolution to capture the spectrum of turbulent wall shear stress fluctuations. As a result, micromachining techniques are employed to enable the sensor to meet the sensing requirements. The sapphire-based, optical transduction technique allows the sensor to operate in high temperature environments while mitigating susceptibility from electromagnetic interference. The micro-scale structures of the optical sensor are hydraulically smooth to enable non-intrusive wall shear stress measurements. BENEFIT: The benefits of the sapphire-based, optical wall shear stress sensor enable the following benefits: - extend wall shear stress sensing capabilities at extreme temperatures (>1500C) - new high-speed measurement systems - uniform sapphire material sensors for matched thermal expansion - optical transduction scheme for reduce EMI Commercial benefits of the sensor include: - wall shear stress measurements in a high speed flow application - flow separation detection - flow control - feedback sensor

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

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