Spectral and Total Radiation Properties of Turbulent Hydrogen/Air Diffusion Flames

Abstract

A study of the structure and radiation properties of round turbulent hydrogen/air diffusion flames is described. Measurements were made of mean and fluctuating streamwise velocity, mean temperatures, species concentrations, spectral radiation intensities, and radiant heat fluxes. The measurements were used to evaluate predictions based on the laminar flamelet concept and narrow-band radiation models both ignoring (using mean properties) and considering (using a stochastic method) effects of turbulence/radiation interactions. State relationships found by correlating auxiliary measurements in laminar flames proved to be almost equivalent to conditions for local thermodynamic equilibrium. Structure and radiation predictions were reasonably good for present test conditions. Effects of turbulence/radiation interactions were significant for these flames, causing almost a 100 percent increase in spectral radiation intensities, in comparison to mean property predictions, upstream of the flame tip.

Modelling lifted hydrogen jet fires using the boundary layer equations

“…The computational modelling of rim-stabilised fires is mature with good agreement between the predicted and measured mean temperature and major chemical species established, Gore et al (1987) for example. This is not the case for lifted jets where computational studies have focussed on understanding the mechanism for the location of the combusting flame base and good agreement between predicted and measured flow properties The ratio of these time-scales is defined as the Damköhler number.…”

“…The details of implementation are considered further below. As jet fires have a dominant flow direction it is common for the flame structure of a rim-stabilised jet fire to be calculated in this way, Gore et al (1987). The computational advantages of a parabolic flow model over a fully elliptic solver are clear, as no iteration cycle of a pressure correction algorithm is required in its solution as the dominant flow direction has a time like quality allowing a marching procedure in the dominant flow direction.…”

Radiation/turbulence interactions in pulverized-coal flames. Second year technical progress report, September 30, 1994--September 30, 1995

“…More recently, studies by Cox (1977), Tamanini (1977), Kabashnikov and Kmit (1979), Souil et al, (1980Souil et al, ( , 1984, Grosshandler and Joulain (1986), Fischer et al (1987), Fischer and Grosshandler (1988), as well as Faeth and his students (Jeng et al, 1984;Gore andFaeth, 1986, 1988;Gore et al, 1987aand 1987b, Kounalakis et al, 1988Gore, 1988) discussed and showed the strong coupling effects between turbulence and radiation.. A detailed discussion of studies related to turbulentradiation interactions was given by Faeth et al (1985Faeth et al ( , 1989.…”

Radiation-turbulence interactions in pulverized-coal flames. Technical report for quarter VI, December 15, 1994--March 30, 1995

“…The attempts to account for the effects of radiation on flow and temperature fields in a turbulent environment include those by Cox (1977), Tamanini (1977), Kabashnikov and Kmit (1979), Grosshandler and Joulain (1986), Fischer et al (1987), Fischer and Grosshandler (1988), as well as Faeth and his students (Gore andFaeth, 1986, 1988;Gore et al, 1987aand 1987b, Kounalakis et al, 1988Gore, 1988) who discussed and showed the strong coupling effects between turbulence and radiation. A detailed discussion of studies related to radiation-turbulence interactions w& given by Faeth et al (1985Faeth et al ( , 1989.…”