Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1993-05-20
1994-11-22
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
Using differential pressure
7386163, G01F 144, G01F 146
Patent
active
053657950
ABSTRACT:
The present invention provides a method and device for ascertaining flow rate of a fluid based on measured values of the upstream fluid total-pressure and static-pressure measured downstream the entrance of a flow constricting member, such as an orifice plate, a flow nozzle or a venturi. According to principles set forth herein, this parameter allows simplification of flow rate determinations for both compressible and incompressible fluids. As a result, significant computational advantages may be achieved in comparison with the prior art. In presently preferred embodiments, a first pressure sensor means for detecting the upstream total fluid pressure includes a pitot-tube fluid-pressure sensor. In order to determine fluid density, a temperature probe may be provided to detect total temperature at the stagnation point created by the pitot tube. A second pressure sensor is also provided to detect the desired downstream static fluid pressure. A flowmeter constructed according to the invention further includes a suitable processor for receiving the measured information and determining flow rate based thereon.
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Chilcot Jr. Richard E.
Ingersoll Buchanan
Oen William L.
Pugh Robert J.
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