Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures
KAUST DepartmentClean Combustion Research Center
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AbstractBlow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.
CitationWang Q, Hu L, Chung SH (2017) Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures. Combustion and Flame 176: 358–360. Available: http://dx.doi.org/10.1016/j.combustflame.2016.11.016.
SponsorsThis work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).
JournalCombustion and Flame