Flow control system with density compensation

Details Flow control system with density compensation Flow control system with density compensation

1978-12-15

1980-04-22

Cohan, Alan

Fluid handling

Line condition change responsive valves

Consistency responsive

73 54, G05D 2400

Patent

active

041990030

ABSTRACT:
Apparatus for continuously measuring and correcting for fuel density in an ircraft engine fuel metering system. Fuel, sampled at the inlet to the engine metering valve, is fed through a flow regulator to a vortex spin chamber in which the fuel is tangentially injected. A magnetic ball carried by the fuel in a race integral with the vortex chamber generates an electrical pulse in an electromagnetic coil at a frequency proportional to the tangential velocity of the fuel. The pulse frequency is compared to a reference frequency and the error signal modulates the regulator to maintain the tangential velocity constant. The radial static differential pressure of the chamber is directly proportional to the fuel density. This signal provides a compensating signal to the fuel metering valve for correcting the mass flow rate of the fuel based on a known true volumetric flow rate.

REFERENCES:
patent: 2716337 (1955-08-01), Fontein
patent: 3181348 (1965-05-01), Lewis
patent: 3215185 (1965-11-01), Black
patent: 3372596 (1968-03-01), Keller
patent: 3465573 (1969-09-01), Shoemaker

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