Sammendrag
A laminar one-dimensional hydrogen-air flame travelling and quenching towards a
chemically inert permeable wall (PW) is studied. Hydrogen flows through the wall into the
premixed H2-air. The S3D numerical code with detailed chemistry is used. PW results are
compared against results of an impermeable wall (IW), including effects of varying wall
mass flux, stoichiometry, inert dilution and unburned-gas and wall temperatures. The
maximum reaction heat release rate occurs at the wall in all cases. For rich and stoichiometric mixtures, PW with fuel influx gave a moderate reduction of the quenching (i.e.
maximum) wall heat flux compared to IW, whereas for a lean mixture, the increase is
considerable. Effects of the fuel influx on the importance of individual elementary reactions and radicals and intermediate species are investigated. The lean PW cases have
similarities to much richer IW cases. Both a lower wall temperature and dilution reduce the
burned-mixture temperature and, consequently, the wall heat flux.
chemically inert permeable wall (PW) is studied. Hydrogen flows through the wall into the
premixed H2-air. The S3D numerical code with detailed chemistry is used. PW results are
compared against results of an impermeable wall (IW), including effects of varying wall
mass flux, stoichiometry, inert dilution and unburned-gas and wall temperatures. The
maximum reaction heat release rate occurs at the wall in all cases. For rich and stoichiometric mixtures, PW with fuel influx gave a moderate reduction of the quenching (i.e.
maximum) wall heat flux compared to IW, whereas for a lean mixture, the increase is
considerable. Effects of the fuel influx on the importance of individual elementary reactions and radicals and intermediate species are investigated. The lean PW cases have
similarities to much richer IW cases. Both a lower wall temperature and dilution reduce the
burned-mixture temperature and, consequently, the wall heat flux.