体相微纳米尺度泡状流预混合燃料的喷雾特性研究

For the requirement of high-quality oil-air mixing in limited time and space during the spray process of engine combustion,a preparation method of premixed micro-nano bubble flow mixed fuel(target fuel)is proposed.And the spray characteristics of the target fuel are investigated and compared with traditional diesel.The results showed that the incorporation of bulk phase micro-nano bubbles reduces the tip penetration of fuel spray and promotes the spray radial diffusion,resulting in an increase in spray cone angle,maximum spray width and spray area.And the effects of the target fuel on the spray process enhance with increasing bubble concentration.When the ambient back pressure and injection pressure increase,the optimization effect caused by the bulk phase micro-nano bubbles gradually diminishes,which leads to a decrease in the spray difference between bubble flow premixed fuel and traditional diesel,but the spray atomization quality of micro-nano bubble premixed fuel is still better than traditional diesel.The target fuel is expected to achieve superior atomization at low injection pressures,which is significant for reducing the cost of fuel injection systems and improving engine thermal efficiency.Therefore it is suitable for low injection pressure or low compression ratio engines with lower technology costs.