Application of the Total Transmittance Nonhomogeneous Radiation Model to Methane Combustion

The total transmittance nonhomogeneous model (TTNH) is about 500 timesfastr faster than narrow-band models, and it is usually within 10 percent of the more accurate computation. The purpose of this article is to extend the TTNH model to include CH/sub 4/ and CO as well as CO/sub 2/ an H/sub 2/O, and to include interaction with a black bounary where previously the model had been limited to transparent bounaries. Several realistic combustion examples are presented in which the radiant intensity from a hot, black wall interacts with a nonisothermal volume containing variable concentrations of CO/sub 2/, H/sub 2/O,, CH/sub 4/, CO, and soot. The calculations indicate that the TTNH model can be reliably applied to nonhomogeneous combustion environments containing methane and that the presence of a radiative boundary poses no computational difficult.