부산대학교 도서관

The self-acceleration characteristics of cellular flame of low calorific value (LCV) gas in a constant volume combustion bomb were studied, the propagation process of spherical flame with different hydrogen (H 2) addition and initial pressure was analyzed, and the flame radius versus time was also discussed. The experimental results show that the self-acceleration of the cellular flame of LCV gas blended with hydrogen appears at high pressure, high hydrogen ratio and lean burn. The acceleration index increases with the increase of hydrogen addition and the reduction of equivalence ratio, and increases with the increase of initial pressure, but the acceleration index does not infinitely increase with the increase of initial pressure. With the increase of the hydrogen addition and the reduction of the equivalence ratio, the critical radius of the cellular flame decreases, which is shown that increase of the hydrogen addition and the lean burn will make appearance of cellular flame in advance. When the ratio of hydrogen is less than 60%, the critical Peclet number decreases with increase of hydrogen addition, when the ratio of hydrogen continues to increase to 80%, it increases slightly. The research in this paper provides an experimental basis for the in-depth study of engine combustion of LCV gas blended with hydrogen. • The self-acceleration of cellular flame appears at high pressure, high H 2 ratio, lean burning. • The flame with cellular instability produces self-accelerate, flame radius increases with time. • As self-acceleration appeared, the flame expressed fractal characteristic, no self-turbulence. • The flame acceleration characteristics occur with uniformly distributed cellular flame. • With increase of H 2 ratio and reduction of φ, the critical radius of cellular flame decreases. [ABSTRACT FROM AUTHOR]