Abstract: A remote-controlled combustion test bench was set up to investigate the non-premixed combustion process of natural gas and oxygen， and the temperature distribution of multiple jets combustion flame was analyzed by the indirect temperature measurement. The Realizable k-ε turbulence model was used to study the flow field characteristics of parallel multiple jets， and the equilibrium chemical reaction model was used to study the non-premixed combustion process of jet. The numerical results have good agreement with those from the experiments. The results indicateed that the entraining and merging behaviors of multiple jets could promote the combustion action. The parallel 45 jets tend to form dual-jet combinations near the nozzle exit. Interactions and re-combinations of the jets could take place during further flowing and eventually form 3 strong flames in the downstream.

Key words: multiple jets, non-premixed combustion, jet merging, scarfing, numerical simulation