A modified model of Lefebvre lean blowout fuel/air ratio containing humidity ratio was proposed based on cold flow field numerical simulation and analysis of humidity ratio effect on the combustion load parameters

combustion reaction and fuel atomization of piloted vaporization flameholder

under the conditions of 300-483 K incoming temperature

014-03 incoming Mach number and 0-016 humidity ratio. The effect of humidity ratio on the lean blowout performance of piloted vaporization flameholder was discussed. It was found that the combustion loading parameters increased with the increase of humidity ratio

and the lean blowout fuel/air ratio increased significantly with the increase of humidity ratio. Therefore

the combustion loading parameter makes it difficult to describe the change of lean blowout fuel/air ratio itself alone

and the effect of humidity ratio on the fuel atomization can not be ignored.