Apparatus for measuring gas velocity

Details Apparatus for measuring gas velocity Apparatus for measuring gas velocity

1982-06-02

1984-10-16

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

7386165, G01F 142, G01F 146

Patent

active

044767293

ABSTRACT:
Apparatus for determining the velocity of a gas in a gas supply duct is provided. The apparatus comprises a flow nozzle and a pitot tube. The flow nozzle has an inlet opening for receiving the gas and an outlet opening for expelling the gas after it has accelerated through a throat connecting the openings. The throat narrows in a curve from the inlet opening to outlet opening. The nozzle is mounted in the duct coaxially in a fluid-tight relationship therewith, the cross-sectional area of the duct and the cross-sectional area of the inlet opening being substantially identical. The cross-sectional area of the outlet opening is 40 to 60 percent that of the duct. The pitot tube comprises an impact tube and a static tube mounted in parallel through the duct downstream of the nozzle and both bending upstream toward the nozzle parallel to the duct axis. The opening of the impact tube is located in the volume bound by the cross-sectional area of the outlet opening and a distance of up to 6.25 percent of the duct inside diameter downstream of the outlet opening. The static tube has a plurality of apertures in the portion located in the volume bounded by the cross-sectional area of the outlet opening and a distance of up to 12.5 percent of the duct inside diameter downstream of the outlet opening.

REFERENCES:
patent: 1145234 (1915-07-01), Dodge
patent: 1249601 (1917-12-01), DeFerranti
patent: 2929248 (1960-03-01), Sprenkle
patent: 3636765 (1972-01-01), Brown
patent: 3733898 (1973-05-01), Yamamoto et al.
patent: 3981193 (1976-09-01), Goulet
patent: 4130017 (1978-12-01), Benedict et al.
patent: 4280360 (1981-07-01), Kobayashi et al.
patent: 4372170 (1983-02-01), Dehart et al.
patent: 4372171 (1983-02-01), Brant, Jr.

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