Experiment on lift-off characteristics of butane jet flame in vitiated co-flow

Abstract

Butane has the potentiality to be a new-era energy source. MILD combustion can be realised by jet flame in vitiated co-flow. Lift-off height is an important parameter of jet flame in vitiated co-flow. This study aimed at understanding the effects of co-flow condition on lift-off characteristics of the butane jet flame. Vitiated co-flow conditions are created with O₂-methane pre-combustion, co-flow equivalence ratios of methane/air mixtures changed from 0.5 to 0.7. On the basis of the results, O₂ concentration shows main effects on the lift-off height changing tendency versus Re_j. The increase of O₂ concentration results in a decreasing tendency, while a further increment of O₂ concentration stabilises the value of lift-off height. Under the turbulent butane central jet fuel, co-flow rate doesn’t show an obvious and monotonous effect on the lift-off height of butane jet flame in vitiated-flow.

Keywords:

• Lift-off height
• vitiated co-flow
• butane jet flame
• O₂ concentration
• co-flow rate

Disclosure statement

The authors declare that they have no conflict of interest.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (No. 51376171) and the Doctoral Foundation of Southwest University of Science and Technology (No. 18zx7164).