No abstract

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.

This paper applies a commercial field-model code, CFX, to predict the ISO 9705 compartment fires for three different ventilation rates. The predicted results generally agree well with the corresponding experimental data. The ventilation intensity changes the flow path of entrained air and flow structure on the doorway plane to affect the fire structure inside the compartment and mass flow rate across the doorway. There exist many recirculation cells in the compartment to facilitate the mass and heat transfer. The temperature stratification phenomenon is found away from the burner. The thinnest hot layer is observed in the ventilation rate of 2 kg/s.