Instrumentation system for determining flow stagnation points

Details Instrumentation system for determining flow stagnation points Instrumentation system for determining flow stagnation points

1991-10-28

1993-06-15

Woodiel, Donald O.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

73180, 7320411, 244203, G01C 2100, G01M 900

Patent

active

052188639

ABSTRACT:
A method and portable microcomputer-based system for determining flow field stagnation points are disclosed. The apparatus uses hot film sensors wrapped around the leading edge of an airfoil to measure boundary layer oscillations. A plurality of sensor signals are provided which may be selected in groups. Signals from sensors in any group are read simultaneously. The signals are then converted to digital form and displayed on the video display of a microcomputer. Points of airflow stagnation are characterized by a doubling in frequency or other discrete harmonics and by a reversing of the phase of oscillations. Those points are identified by displaying and comparing signals from different sensor locations on a video display.

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