Study on the Effects of Dome Fuel Distribution Ratio on Lean Blowout of a Model Combustor

The experimental studies and numerical simulation were conducted on the effects of the dome fuel distribution ratio on the lean blowout of a model combustor. The experimental results indicate that as the key parameter, the dome fuel distribution ratio, increases from 2.06% to 16.67%, the lean blowout equivalence ratio declines obviously at the beginning, and then the decrease slows down, in addition, the amplitude of the pressure fluctuation in the combustor reduces significantly while the dominant frequency keeps basically constant. In order to analyze the experimental results, the numerical simulation is adopted. The temperature and local equivalence ratio distributions are employed to explain the reason why the lean blowout performance improves with the increase of the dome fuel distribution ratio.