Fuel injector for atomizing and vaporizing fuel
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation
InventorsJacques Emile Jules Caruel, Jean Robert Bedue, Bernard Andre Cantaloube
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Abstract
A fuel injector in which, an annular intermediate flow containing fuel is ndwiched between an inner and an outer flow of air caused to rotate by swirl-promoting bladed devices called "swirlers," the inner flow being generated in a tubular duct which is closed at its upstream end with a bottom plate, and the "swirler" associated with said inner flow being a centripetal bladed device that opens to the tubular duct upstream of an annular duct supplied with fuel and itself opening at its downstream end to the tubular duct, thus forming a sharp enlargement within the tubular duct.
Claims14
A fuel injector for atomizing and vaporizing fuel into an airflow, comprising a jacket (10) with a generally cylindrical inner surface (10a) having its axis generally parallel to the airflow direction, means (11) structurally associated with said jacket to form a generally cylindrical shield (14) extending coaxially with and over a substantially smaller axial extent than said cylindrical inner surface (10a), said axially smaller cylindrical shield (14) being spaced internally of an upstream section only of said cylindrical inner surface (10a) and ending short of a downstream section of said cylindrical inner surface (10a) thus leaving said downstream section unshielded, whereby said shield (14) defines with said cylindrical surface (10a) both a stepped tubular duct (3) and an annular duct (4) bounded by said shield (14) and said upstream section of said inner surface (10a), plugging means (5) fitted at the upstream end of said tubular duct (3) to bottom the same, a centripetal air swirler (7) leading into said tubular duct (3) and fitted upstream of said shield (14), means (23) tapping air from said airflow to feed said centripetal air swirler (7) thereby producing an inner whirl of air (24) through said tubular duct (3) towards the downstream end of said jacket (10), means (6) for producing an outer whirl of air (15) around said jacket (10) towards the downstream end of said jacket (10), and piping means (21, 20a, 22, 16, 17) for supplying fuel to said annular duct (4).
Dependencies are inferred from the claim text.