Researchers at Xi’an Jiaotong University report on their experimental investigation of laminar burning velocities and the onset of flame instabilities on spherically expanding flames in 2,5-dimethylfuran–air mixtures at elevated pressures in an article in press in the journal Combustion and Flame. Other work has found that DMF is very promising as a new biofuel; not only is the combustion performance similar to commercial gasoline, but the regulated emissions are also comparable. (Earlier post.)
Wu et al. obtained the laminar burning velocities, laminar burning fluxes and Markstein lengths at different equivalence ratios and initial pressures were obtained. They specified the diffusional–thermal and hydrodynamic effects on flame front instabilities, and reported the onset of cellularity.
Results show that laminar burning velocities are decreased with increasing initial pressure due to the increase of the free-stream density and the progressively more important three-body termination reactions. With increasing initial pressure, Markstein length decrease, while the laminar burning flux increases. Onsets of flame instabilities, expressed in terms of critical radius or Peclet number, were found to be promoted with increasing equivalence ratio and initial pressures, due to the combined effects of diffusional–thermal and hydrodynamic instabilities.—Wu et al.
Xuesong Wu, Zuohua Huang, Xiangang Wang, Chun Jin, Chenlong Tang, Lixia Wei and Chung K. Law (2010) Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures. Combustion and Flame doi: 10.1016/j.combustflame.2010.10.006