Numerical Study of Carbon Dioxide Injection Effect into Oxidizer in Flameless Oxyfuel Combustion

The aim of present study is numerical investigation of carbon dioxide injection effect on the flameless oxy- fuel combustion. For this purpose, different subjects have been analyzed such as various regimes composed in oxy- fuel combustion, temperature distribution and heat release in different values carbon dioxide injection, minimum amount of CO2 for injection in oxidizer and maximum carbon dioxide injected into oxidizer. The counter flow diffusion flame solver used to steady and axisymmetric simulations. Also, a base condition is used with preheating temperature equal 1400K to deliver results. The obtained results show that injection of carbon dioxide into the oxidizer to reduce the maximum and mean combustion temperature. In the carbon dioxide injection over 80 percent of oxidizer mole fraction, this injection causes the maximum and average temperature reduced than air- fuel combustion with nitrogen injection into oxidizer. As well as, this results indicate that prior to achieve flameless combustion the maximum amount of carbon dioxide injectable into the oxidizer is constant and does not change by increasing of preheating temperature.