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An annular combustion chamber having air jackets around its inner and outer walls, and having in combination a plurality of liquid fuel nozzles mounted in equi‐spaced relationship and circular formation around one end of the chamber with the axes of the nozzles lying centrally between the inner and outer walls of the chamber, air‐swirling means surrounding each nozzle, a hollow annular nosepiece extending from the said end of the chamber, and shaped to direct air to the air jackets, an annular air entrance situated adjacent to the outer end of the nosepiece, an annular hood surrounding the nose piece and forming therewith air passages leading from the air entrance to the air jackets, and a plurality of air scoops situated in equi‐spaced positions within the nosepiece and leading from one of the air passages to the air‐swirling means around the fuel nozzles.