Project Title:

High-Alpha, Unsteady Surface-Flow, Diagnostic Tool for Aircraft Dynamics

92-1-02.05-7093                                                   NAS01-19918
High-Alpha, Unsteady Surface-Flow, Diagnostic Tool
     for Aircraft Dynamics
Analytical Services & Materials, Inc.
107 Research Drive
Hampton, VA  23666
Siva M. Mangalam                                     (804-865-7093)

Abstract:

     An innovative high-alpha, unsteady flow, diagnostic tool
incorporating advanced flow sensors, instrumentation, and surface-
flow signature analysis, will be developed for investigating
dynamic stall. Phase I will investigate high-alpha flow dynamics
in wind tunnel tests. Unsteady pitch motions will be imparted to a
model instrumented with multi-element hot-film sensors. Signature
analysis of simultaneously acquired signals from multiple sensors
will be used to capture post-stall flow characteristics such as
the location of the instantaneous' stagnation, separation, and
reattachment points and their associated unsteadiness (frequency),
thus allowing the demarcation of unsteady flow separation regions.
Phase II will test and develop a flight-validated, unsteady-flow
diagnostics tool capable of describing dynamic stall
characteristics and establishing a technical design data base for
unsteady aircraft dynamics, simulation, and control applications.

Potential Commercial Application:

Potential Commercial Applications:  A flightworthy, integrated,
unsteady-flow diagnostic tool capable of describing dynamic stall
characteristics will find a ready market in organizations involved
in aircraft design, manufacture, testing, and the validation of
computational tools.

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