Pumps – One fluid pumped by contact or entrainment with another – Jet pump with motive fluid generating pump
Patent
1975-09-15
1977-07-26
Freeh, William L.
Pumps
One fluid pumped by contact or entrainment with another
Jet pump with motive fluid generating pump
417 89, 417179, 417197, F04B 2314, F04F 546
Patent
active
040379914
ABSTRACT:
An inlet line connected to the inlet of a hydraulic pump includes a jet pump having a Venturi nozzle though which the aspired liquid is passed, and into which a coaxial jet of liquid under higher pressure is introduced to raise, by jet-pump action, the pressure of the liquid at the pump inlet. In order to increase the efficiency of pressure recovery in the diffusor part of the Venturi nozzle, fuel under higher pressure than the aspired liquid fuel is also introduced into the flow of incoming fuel through the wall of the Venturi nozzle, at a point preceding the throat, via inlet slots so arranged that, when there is a flow of fuel through the nozzle passage, the Coanda effect of the additional fuel thus introduced causes the thus introduced fuel to form a layer moving along the walls of the throat and diffuser portion of the Venturi nozzle, and separating the stationary surface of the throat and diffusor walls from the flow of fluid obtained by the action of the central jet, thereby counteracting the tendency to wall detachment which in conventional jet pumps is caused by boundary-layer action.
REFERENCES:
patent: 3047208 (1962-07-01), Coanda
patent: 3306525 (1967-02-01), Dornier
patent: 3525474 (1970-08-01), Ohain et al.
patent: 3551073 (1970-12-01), Petrovits
patent: 3735778 (1973-05-01), Garnier
patent: 3736072 (1973-05-01), Turner et al.
patent: 3880354 (1975-04-01), VanHorn
"Experimental Thrust Augmentation of a Variable Geometry, Two Dimensional Coanda Wall Jet Ejector," Aeronautical Report LR-394, National Research Council of Canada, by W. J. Scott.
"Applications of the Canada Effect," Scientific American, June, 1966, by Imants Reba.
Freeh William L.
Look Edward
The Plessey Company Limited
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