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A combustion system includes a combustion chamber and a fuel injection apparatus, where a radial inflow swirler stage in the injector housing includes a plurality of radial inflow swirlers spaced longitudinally from each other to direct air radially inward in a swirling motion to cause fuel streams

A combustion system includes a combustion chamber and a fuel injection apparatus, where a radial inflow swirler stage in the injector housing includes a plurality of radial inflow swirlers spaced longitudinally from each other to direct air radially inward in a swirling motion to cause fuel streams to swirl and thoroughly mix with air before passing into the combustion chamber. A plurality of liquid fuel nozzles are supported in the housing in an annular arrangement to dispense liquid fuel in a plurality of sprays in the downstream direction. A plurality of gaseous fuel nozzles are also provided in the housing supported in an annular arrangement intermediate the liquid fuel nozzles. The plurality of gaseous fuel nozzles include a series of nozzles arranged in radial spokes between each of the liquid fuel nozzles, with the size of the openings in the gaseous fuel nozzles increasing in the radially outer direction from the longitudinal axis of the housing. An outer annular flow passage is provided around the nozzles to create a cylindrical sheet of air around all the fuel streams, while an annular flow passage is provided around each of the liquid fuel nozzles to provide an annular flow of air around each of the liquid fuel sprays. A central air passage provides air centrally of the arrangement of nozzles. The air vaporizes the liquid fuel as the fuel passes downstream through the housing.

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[ What is claimed is:] [1.]1. A fuel injection apparatus, comprising:a longitudinally extending housing having an upstream fuel inlet end and a downstream fuel outlet end;a liquid fuel inlet to a plurality of liquid fuel spray devices in the housing, said liquid fuel spray devices supported in an an

[ What is claimed is:] [1.]1. A fuel injection apparatus, comprising:a longitudinally extending housing having an upstream fuel inlet end and a downstream fuel outlet end;a liquid fuel inlet to a plurality of liquid fuel spray devices in the housing, said liquid fuel spray devices supported in an annular arrangement in the housing to dispense liquid fuel in a spray in the downstream direction through the housing;an air inlet to an upstream flow passage in the housing surrounding the liquid fuel spray devices to direct air in a cylindrical flow downstream around the liquid fuel spray; anda radial inflow swirler stage to a plurality of downstream flow passages, said downstream flow passages spaced downstream from the liquid fuel spray devices to direct a flow of air radially inward in a swirling motion in the housing to cause the fuel spray to swirl and thoroughly mix with air in the housing.