When fans and compressor fansets spin around, so does the air that goes through them thoughout the enigne; so why do injectors spray fuel straight backwards? I realize the compressor outlet guide vanes and turbine inlet guide vanes help with flow direction, I'm talking about the spray head itself, what direction is it oriented along the axis of the engine axial? Looking at a picture of an annular combustion liner (below), I don't see any indication that while the flow goes around, that the injectors spray anywhere but along the chamber length.
Or is the difference negligible?
Side question: does engine RPM vary the amount of airflow spin?
[Edited 2006-08-27 00:16:26]