NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 01.04-4434

PROJECT TITLE : On-Line Identification of Unsteady Viscous Effects for Flow Modeling and Control.

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

Micro-thin smart-sensor arrays and multi-channel Constant Voltage Anemometer (CVA) instrumentation system will be integrated with hybrid digital signal processing (DSP) techniques to obtain quantitative characterization of viscous flow phenomena. The proposed innovation will be the first quantitative unsteady aerodynamic diagnostics system (QUADS) for simultaneous on-line identification of attachment line, flow reversal, separation and boundary-layer transition. Wind-tunnel tests will be conducted in Phase I to quantitatively characterize unsteady viscous flow phenomena on a flat plate with unsteady separation, and on pitching and oscillating cylinder and airfoil models using measured signal RMS, intermittency, mean output voltage and correlation coefficients. Hybrid DSP techniques incorporating higher-order statistical moments, wavelets transforms, and neural networks will be developed in Phase II. QUADS will be a highly productive and accurate tool for creating bench-mark experimental data for transition and turbulence modeling, CFD code validation testing, development of accurate mathematical modeling of unsteady aerodynamics, evaluation of new design configurations, as well as for routine wind-tunnel testing of complete aircraft and their components in steady and unsteady motion. QUADS has the potential to revolutionize active flow control technology and the applications include separation control, buffet control, high-lift augmentation, and viscous drag reduction.
POTENTIAL COMMERCIAL APPLICATIONS
QUADS has the potential to revolutionize active flow control technology including separation control, buffet control, high-lift augmentation, and drag reduction. QUADS will be a useful tool for CFD code validation, transition and turbulence modeling, evaluation of new design configurations, and routine wind tunnel testing of complete aircraft and their components, encompassing the entire spectrum of viscous flows encountered by subsonic-to-supersonic aircraft
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Siva M. Mangalam
Tao of Systems Integration, Inc.
22 Enterprise Parkway, Suite 150
Hampton, VA 23666
NAME AND ADDRESS OF OFFEROR
Tao of Systems Integration, Inc.
22 Enterprise Parkway, Suite 150
Hampton, VA 23666