Volume 32 Issue 7
Jul.  2017
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Measurements on laminar burning velocities of hydrogen/oxygen/diluents at elevated pressure and temperature[J]. Journal of Aerospace Power, 2017, 32(7): 1599-1604. doi: 10.13224/j.cnki.jasp.2017.07.009
Citation: Measurements on laminar burning velocities of hydrogen/oxygen/diluents at elevated pressure and temperature[J]. Journal of Aerospace Power, 2017, 32(7): 1599-1604. doi: 10.13224/j.cnki.jasp.2017.07.009

Measurements on laminar burning velocities of hydrogen/oxygen/diluents at elevated pressure and temperature

doi: 10.13224/j.cnki.jasp.2017.07.009
  • Received Date: 2015-03-24
  • Publish Date: 2017-07-28
  • The effects of different diluents and dilution ratios on laminar burning velocities of hydrogen/oxygen/diluents mixtures were studied at elevated pressures and temperatures with a constant volume combustion chamber and a high-speed schlieren system. Both experimental and numerical laminar burning velocities of hydrogen/oxygen/diluents mixture were obtained at equivalence ratios of 0.6-4.0, initial pressures of 0.1-0.5 MPa, and dilution ratios of 4-8. The results showed that the laminar burning velocity varied non-monotonically with the increase of the initial pressures and equivalence ratios among 1.0-3.0,and the laminar burning velocity deceased with the increase of initial pressure when the equivalence ratio was less than 1.0 or more than 3.0. Through sensitivity analysis of elemental reaction, three-body reaction(R15) was found to restrain reaction in nitrogen diluted mixture, and promote reaction in both argon and helium diluted mixtures, mainly due to different thermal physics properties of different diluents.When the equivalence ratios were within the ranges of 1.0-3.0, the non-monotonic change of laminar burning velocities with the increase of initial pressures was mainly due to the competition between chain-branching reaction R1 and chain-terminating reaction R15.

     

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