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Can-annular and annular

 Can-annular and annular

  •  In aircraft applications where the frontal area is important, either can-annular or annular designs are used to produce favorable radial and circumferential profiles because of the great number of fuel nozzles employed.
  •  The annular design is especially popular in new aircraft designs; however, the can-annular design is still used because of the developmental difficulties associated with annular designs.
  •  Annular combustor popularity increases with higher temperatures or low-Btu gases, since the amount of cooling air required is much less than in can-annular designs due to a much smaller surface area.
  • The amount of cooling air required becomes an important consideration in low-BTU gas applications, since most of the air is used up in the primary zone and little is left for film cooling.

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