Double-acting pitot tube

Details Double-acting pitot tube Double-acting pitot tube

1986-03-13

1987-07-07

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

G01F 146

Patent

active

046778586

ABSTRACT:
Instead of providing a channel in a Pitot tube for measuring static pressure, a channel is provided which terminates in an orifice facing perpendicular to the direction of the flow to be measured, surrounded by a rim having a surface, which may be quite narrow, that is inclined at between 15.degree. and 45.degree., preferably 30.degree., to the plane perpendicular to the axis of the orifice, in order to intensify somewhat the Bernouilli effect of the flow across the orifice. This produces a suction (reduction of pressure) approximately equal to the increase of pressure sensed at an upstream facing orifice of a second channel produced by the same flow which is being measured. A differential manometer connected to the two channels registers about twice the pressure difference that would be measured between the pressure at an upstream facing orifice and the pressure in a channel that measures merely the static pressure in the flowing medium.

REFERENCES:
patent: 1295046 (1919-02-01), Lohnes
patent: 1438811 (1922-12-01), Coyne
patent: 4047521 (1977-09-01), Kramer et al.

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