The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The results showed that the methane/air mixture with a mixing ratio ranging from 49/51 to 53/47 could interchange biogas commendably, and good combustion behavior was obtained on a typical biogas-burning appliance.Ī two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. Finally, the fundamental combustion behaviors of mixed gases were estimated through the analysis of flame appearance, contamination emissions, and the flame stability region. To accomplish the mixing process and also inject the exhaust mixture into the distribution system, a mixer–ejector was introduced and integrated into the biogas grid. Methane conditioned by the addition of air is described, and can be a supplementary energy injected into a biogas distribution network. In this paper, an appropriate methodology to address the contradiction between biogas supply and demand is proposed. Biogas production efficiency fluctuates with climate variations and agricultural arrangements, which pose a limiting factor upon its single supply to end users via a regional exclusive network, especially in peak demand.
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