Annular combustor for miniature jet engines

A new miniature annular combustion system has been developed for a small existing turbojet engine. Simple V-gutter flameholding and radial fuel injection are employed to achieve flame stabilization. From airflow distribution tests, equivalence ratio in the primary-zone is varied in the range 0.63-0.72, yielding continuous combustion. Intensive combustion is generated by the presence of the V-gutter flameholders and fuel-air premixing. Size and length limitations provide a strong impact on distribution of fuel and dilution of hot gas.