Experimental study of effect of equivalence ratio and initial turbulence on the explosion characteristics of LPG/DME clean blended fuel

The effects of initial turbulence and equivalence ratio on the explosion characteristics of LPG/DME clean blended fuel were investigated experimentally. The results showed that as equivalence ratio increase, the explosion overpressure, rate of pressure rise, and propagation velocity of shock wave assume a “three-zone” structure, that is, first acceleration zone, then attenuation zone, finally stabilization zone. With the increase of initial turbulence, the explosion characteristic parameters such as the maximum explosion overpressure, the maximum pressure rise rate, and the maximum shock wave propagation velocity all showed different degrees of increase, and the reasons for these growths are not the same, which leads to the inconsistent levels of growth. However, the chain-based growth rate of these explosion characteristics parameters decreases with the increase of initial turbulence, which meant that the influence of initial turbulence on explosion intensity was weakened gradually. The maximum explosion overpressure and the maximum rate of pressure rise basically conformed to a linear relationship with the initial turbulence. The results of the paper can provide more basic but important information for the practical use of LPG/DME clean blended fuel, especially in safety protection strategies.