Measuring and testing – Wind tunnel: aerodynamic wing and propeller study
Patent
1992-01-23
1993-12-28
Woodiel, Donald O.
Measuring and testing
Wind tunnel: aerodynamic wing and propeller study
7320418, 7320426, G01F 168, G01M 900
Patent
active
052729150
ABSTRACT:
Disclosed is an airflow sensing system for determining the type of airflow flowing over a flight surface. A hot film sensor is driven by a constant voltage feedback circuit that maintains the voltage across the sensor at a predetermined level. A signal processing circuit receives an output signal of the feedback circuit and determines whether the output signal is indicative of laminar, transitional or turbulent airflow. Transitional airflow is distinguished from turbulent airflow by a signal having significant energy in a low-frequency passband from 50-80 Hz. The signal processing circuit drives a three-color LED display to provide a visual indication of the type of airflow being sensed.
REFERENCES:
patent: Re33076 (1989-10-01), Sugiura
patent: 2748372 (1956-05-01), Bunds, Jr.
patent: 2871698 (1959-02-01), Bagby
patent: 3517556 (1970-06-01), Barker
patent: 3688581 (1972-09-01), Le Quernec
patent: 3817104 (1974-06-01), Sapir
patent: 3861214 (1975-01-01), Siyahi
patent: 3964306 (1976-06-01), Fletcher et al.
patent: 3988928 (1976-11-01), Edstrom et al.
patent: 4061029 (1977-12-01), Fletcher
patent: 4106341 (1978-08-01), Serrano
patent: 4188823 (1980-02-01), Hood
patent: 4478076 (1984-10-01), Bohrer
patent: 4649387 (1987-03-01), Maris
patent: 4727751 (1988-03-01), Holmes et al.
patent: 4774835 (1988-10-01), Holmes et al.
patent: 5074147 (1991-12-01), Sarma
Gelbach Herman R.
Morgan Michael D.
The Boeing Company
Woodiel Donald O.
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