نوع مقاله : مقاله پژوهشی
1 دانشکده مکانیک و هوافضا- دانشگاه صنعتی مالک اشتر اصفهان- ایران
2 دانشکده مکانیک و هوافضا- دانشگاه صنعتی مالک اشتر- اصفهان
3 دانشکده مکانیک و هوافضا- دانشگاه صنعتی مالک اشتر- اصفهان-
عنوان مقاله [English]
Increasing the flame propagation speed with aid of centrifugal force proposed by Lewis is a new challenge that can reduce the length of the combustion chamber and thus increase the thrust to weight ratio. In this study, large eddy simulation of premixed combustion of air-propane mixture in a two-dimensional tube with closed ends have been implemented in OpenFoam Software to investigate the effect of centrifugal force on the flame propagation speed. Comparison of numerical solution results with experimental data showed about 8% error in the most critical centrifugal acceleration (3000g). To investigate the effect of the turbulence model, the combustion simulation using the k turbulence model for 3000g, was compared with the LES model and it was observed that the LES model, investigate propagation speed and flame wrinkling with higher accuracy. Considering the flame surface wrinkling parameter, it was observed that at a centrifugal acceleration equal to 4000g, the flame surface wrinkling, suddenly increased and then decreased rapidly that indicates the extinction of the flame. Then, the effect of pipe length on flame propagation speed and flame wrinkling at 2000g was investigated and it was observed that increasing pipe length and distance from the origin of rotation, the induced centrifugal force increased and as a result, propagation speed and wrinkling Increases.