Research On Atomization Technology Of Kerosene In Spark Ignition Engine

The research on kerosene fuel internal combustion engines is of great significance, since kerosene is relatively safe and easy to store, with its high flash point and poor evaporation. For spark ignition kerosene engine, fuel atomization becomes the primary problem needed to be solved, owing to the higher atomization requirements for kerosene with its high viscosity and low saturated vapor pressure. The air-assisted spray technology is adopted in this article, using fuel spray and auxiliary air interaction to promote fuel atomization, with high fuel atomization quality and low requirements for jet system.Taking an import air auxiliary injector for object, the following research content is carried out, using test and numerical simulation method.1. After surveying the overall size of this injector, the geometry model of nozzle cavity is establi- shed.2. The high-speed camera is adopted for this injector, the results show that:1) with the passage of time,the spray throughout distance increases, and the spray cone angle changes littlely.2)with the imp- rovement of back pressure,the spray throughout distance decreases,and the airflow suck effect increa- ses in the spray end.3. Flow and spray characteristics of this injector are calibrated and tested, with the results that:1) the sauter mean diameter(the SMD value) decreases along with the air /fuel ratio increasing, and cha- nges not obviously as the air/fuel ratio increases further.2)the SMD value decreases with the air/fuel injection pressure increasing.4. The numerical simulation of gas flow characteristics inside the nozzle is completed, the results show that: the mass flow of gas increases with the increasement of the minimum cross-sectional area, in addition, the air has reached supersonic flow near the nozzle exit.5. Based on the spray test of this nozzle, the simulation of spray mixing process is completed.The results of this paper provide important theory and numerical basis for the design of the air assisted injector and the kerosene combustion direct injection systems.