Air flow measurement system having reduced sensitivity to...

Details Air flow measurement system having reduced sensitivity to... Air flow measurement system having reduced sensitivity to...

2006-05-02

2006-05-02

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Proportional

C073S204210, C073S204220

Reexamination Certificate

active

07036366

ABSTRACT:
A system for measuring air flow rate in a duct includes an air flow sensor and an air flow conditioning device for collecting and accelerating a portion of the total air stream to the sensor, which may be means as known in the art. The conditioning device includes two opposed converging walls defining a nozzle, preferably a venturi, the sensor being disposed in the throat of the nozzle. The surfaces of the venturi walls are textured to trip the boundary layer near the wall surface into turbulence to maintain attachment of flowing air to the walls even when the angle of attack of the air is significantly non-axial. The wall texturing may be random or may be an organized pattern. A further embodiment includes a second flow conditioner/sensor in parallel with the first whereby an averaged flow measurement is taken for a more accurate reading.

REFERENCES:
patent: 6240775 (2001-06-01), Uramachi et al.

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