Many fuel injector geometries proposed for lean-premixed combustion systems involve the
use of radial swirlers. At the high swirl numbers needed for flame stabilization, several
complex unsteady fluid mechanical phenomena such as vortex breakdown and recirculation
zone precession are possible. If these unsteady aerodynamic features are strongly periodic,
unwanted combustion induced oscillation may result. The present paper reports on an
isothermal experimental study of a radial swirler fed fuel injector originally designed by …

Many fuel injector geometries proposed for lean-premixed combustion systems involve the
use of radial swirlers. At the high swirl numbers needed for flame stabilisation, several
complex unsteady fluid mechanical phenomena such as vortex breakdown and recirculation
zone precession are possible. If these unsteady aerodynamic features are strongly periodic,
unwanted combustion induced oscillation may result. The present paper reports on an
isothermal experimental study of a radial swirler fed fuel injector, and examines the …