- Author
- Skinner, S. M. | Gore, J. P.
- Title
- State Relationships for CH4+C2H2/Air Diffusion Flames.
- Coporate
- Maryland Univ., College Park
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
- Session A-5
- Contract
- NIST-GRANT-60NANB8D0834
- Book or Conf
- Combustion Institute/Eastern States Section. Chemical and Physical Processes in Combustion. Fall Technical Meeting, 1990. December 3-5, 1990, Orlando, FL, 42/1-4 p., 1990
- Keywords
- combustion | laminar flames | diffusion flames | mixing | methane | acetylene
- Identifiers
- gas sampling; air flows; fuel mixtures
- Abstract
- The conserved scalar approximation is based on the assumption that concentrations of major gaseous species in a diffusion flame are unique functions of a single variable that is conserved (neither produced nor consumed in the entire flow field). Bilger observed that conserved scalar approximation can be applied to hydrocarbon/air diffusion flames based on experimental data for combustion of propane, methane and heptane. This approximation has been successfully used in the prediction of nonluminous flame radiation by Faeth and coworkers. The unique functions describing the species concentrations as a function of mixture fraction (a conserved scalar defined as the fraction of mass that originated in the reactant stream in a two stream problem) have come to be called state relationships. Many practical applications, such as furniture and oil well blowout fires, involve the combustion of fuel mixtures with air. Furthermore, the number of fuel mixtures that can occur is infinite precluding measurements of state relationships. For engineering calculations, it is desirable to estimate the state relationships for fuel mixtures based on limited number of measurements.