Power plants – Reaction motor – Air passage bypasses combustion chamber
Patent
1975-10-08
1977-10-04
Croyle, Carlton R.
Power plants
Reaction motor
Air passage bypasses combustion chamber
60269, 60 3972R, F02K 300
Patent
active
040516717
ABSTRACT:
A jet engine having outer and inner tubular casings with an annular fluid passage therebetween, a combination motor fan and compressor mechanism having fluid driven vanes and compressing vanes which are used to compress the incoming fluid charge to an engine burner located in the inner casing; each of the casings defining at their outflow ends a nozzle orifice; the fluid driven vanes being part of a motor fan and radially overlying the compressor vanes and having an average mean diameter greater than that of the compressor vanes. The compressor vanes discharge fluid under pressure into the burner area of the inner tubular casing while the fluid driven vanes communicate with the annular space between the inner and the outer tubular casings. Apertures are provided in the inner tubular casing downstream of the burner in that area where the burning and expansion of gasses is taking place; air is drawn through these apertures from the annular passage into the combustion chamber by Venturi effect to increase the velocity of air through the fluid driven vanes. Also, due to the axial spacing between the inner casing and outer casing nozzles, the flow of air in the annular passage is further increased. The ratio of the mean diameter of the fluid driven vanes to the compressor vanes and the ratio of the total aperture area plus an area defined between the nozzles of the inner and outer casings combine to increase the boost ratio of the jet engine thereby increasing its efficiency.
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Cohen et al., "Gas Turbine Theory," Longmans, Green & Co., London, 1951; pp. 218-238.
LeFebvre, A. H., "Advanced Gas Turbine Combustion Chambers," Pergamon Press, Oxford, 1967; pp. 3-15.
Croyle Carlton R.
Garrett Robert E.
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