a truncated conical portion 28 opening in the downstream direction and a cylindrical portion 30 extending a short distance downstream from the conical portion operation of the apparatus is best understandable by viewing the schematic representation of fuel air mixing flow and subsequent combustion illustrated in fig3 air discharging from the diffuser section of the engine is represented by the arrows upstream of the scoop 20 the air flows in an annular stream toward the combustion chamber the smoothest and most concentrated flow occurs toward the axis a of the combustion chamber a greater arrow density in that region illustrates this concentration a single fuel nozzle is illustrated below the axis a the scoop 20 associated with that nozzle extends forward from the upstream end of the combustion chamber and opens in conical form to a wider frontal area with respect to approaching flow additionally the scoop extends upstream of the fuel manifold 16 to a region relatively free of structural proturberances capable of causing flow distortions in the construction illustrated herein the scoops have an arcuate portion 22 extending in an upstream direction relative to the remaining portion thereof and capable of intercepting additional flow near the axis a of the combustor the extension of the scoops toward the axis a is most readily viewable in fig2 each scoop collects air discharging from the diffuser.