Power plants – Reaction motor – Air passage bypasses combustion chamber
Patent
1978-12-26
1980-08-05
Hart, Douglas
Power plants
Reaction motor
Air passage bypasses combustion chamber
181213, 181220, F02K 102
Patent
active
042155363
ABSTRACT:
Fluid mixing apparatus for mixing the coaxially flowing streams of fan air and primary exhaust within a turbofan engine are disclosed. Each of the disclosed arrangements include a generally tubular mixer section that extends axially rearward from the engine turbine flange. The mixing apparatus includes axially extending regions in which contiguous portions of the fan stream are induced to flow radially inward to penetrate the primary flowstream and includes axially extending regions in which contiguous portions of the primary flowstream are induced to flow radially outward to penetrate the fan stream. The regions inducing the outwardly directed flow of the primary flowstream and the regions inducing the inwardly directed flow of the fan stream are circumferentially interspersed with one another to establish a flow pattern which causes mixing to occur along the axial length of the mixing apparatus and causes mixing to continue within a common exhaust duct located aft of the mixing apparatus. In some of the disclosed arrangements, a series of deflection vanes are positioned across each of the regions that divert the fan flowstream and each of the regions that divert the primary flowstream. In other arrangements, only the regions for diverting fan flow or the regions for diverting primary flow include such deflection vanes. In each arrangement an annular free mixing boundary is formed along the forward portion of the mixing apparatus to minimize the effect of the mixer geometry on the engine cycle of the gas turbine engine in which the apparatus is employed.
REFERENCES:
patent: 3048376 (1962-08-01), Howald
patent: 3065818 (1962-11-01), Lombard
patent: 3092205 (1963-06-01), Brown
patent: 3289413 (1966-12-01), Gist
Hart Douglas
The Boeing Company
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