Premixed and stratified Liquefied Petroleum Gas (LPG)/air flames realized on a bluff body swirl-stabilized burner are studied in confined environment. A laboratory-scale is designed such way that it can independently investigate the effects of mixture stratification, swirl number, direction, Reynolds number broad range test conditions. total 80 different cases investigated, with four combinatio...

The mechanism for deflagration-detonation-transition (DDT) by turbulent preconditioning, suggested to explain the possible occurrence of delayed detonations in Type Ia supernova explosions, is argued to be conceptually inconsistent. It relies crucially on diffusive heat losses of the burned material on macroscopic scales. Regardless of the amplitude of turbulent velocity fluctuations, the typic...

This paper outlines a theoretical approach for predicting the onset of detonation in unconfined turbulent flames. Two basic assumuptions are made: 1) the gradient mechanism is the inherent mechanism that leads to DDT in unconfined conditions, and 2) the sole mechanism for preparing the gradient in induction time is by turbulent mixing and local flame quenching. The criterion for DDT is derived ...