Experimental investigation of the entrainment during combustion of soybean biodiesel sprays

Yifeng Wu, Ronghua Huang, F. Chia Fon Lee, Zhaowen Wang

Research output: Contribution to journalArticlepeer-review


Pure soybean biodiesel and diesel were experimentally tested inside a constant-volume combustion chamber. The effect of ambient temperature on the flame lift-off length of direct-injection (DI) sprays under quiescent conditions was investigated using OH chemiluminescence imaging. Then the impacts of the observed lift-off length variations on the entrainment (i.e. oxygen ratio) at the lift-off location were studied. The ambient temperature was varied from 800 K to 1200 K. The ambient density, oxygen concentration, injection pressure and duration were unchanged during the experiments. The results show that as the ambient temperature increases, the lift-off length will decrease for both fuel sprays, especially when the ambient temperature changes from 800 K to 900 K. Biodiesel has a longer lift-off length than diesel at all tested ambient temperatures. Similar trends happened to the oxygen ratio at the lift-off length of sprays, however, the difference in oxygen ratio of biodiesel and diesel is more significant compared with lift-off length results.

Original languageEnglish (US)
Pages (from-to)104-107
Number of pages4
JournalHuazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition)
Issue number11
StatePublished - Nov 1 2010


  • Constant-volume combustion chamber
  • Diesel
  • Entrainment
  • Lift-off length
  • Soybean biodiesel
  • Spray

ASJC Scopus subject areas

  • Computer Science(all)


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