Measuring and testing – Navigation – Leeway incidence or side-slip
Patent
1975-02-18
1976-07-20
Goldstein, Herbert
Measuring and testing
Navigation
Leeway incidence or side-slip
73194R, G01N 932, G01F 100
Patent
active
039699382
ABSTRACT:
A robust apparatus for measuring the velocity and/or density of a fluid stream comprises a cap-shaped nozzle which deflects pressurized fluid, issuing from a tube whose end is within the nozzle, back along the external surface of the tube to a receiver so that pressure indicated by a pressure measuring device attached to the receiver measures the velocity and/or density of a fluid stream flowing over the cap along the tube and over the receiver. The receiver may be an oversize, open ended receiver tube coaxial with receiver tube enclosing an annular receiver space around the tube. The receiver may also be a plurality of open ended receiver tubes around the tube, each attached to a different pressure measuring device so that a component of flow of and/or the density of a fluid stream transverse to the tube can be measured.
The nozzle orifice geometry is defined in relation to the Reynolds number at the nozzle orifice in order that the pressurized fluid issues from the nozzle orifice as turbulent flow and the fluid pressure in the receiver is related to the velocity and/or density of the fluid stream in a consistent manner in any number of tests.
REFERENCES:
patent: 3686937 (1972-08-01), Corey
patent: 3705534 (1972-12-01), Turek
"Fluidic Wind Sensor Aids Low Airspeed Measurement" in Control Engineering, Apr. 1971, vol. 18, No. 4, p. 41.
Canadian Patents and Development Limited
Goldstein Herbert
Lemon Francis W.
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