CFD Research On The Effects Of Air-assisted Atomizer Structure On Kerosene Atomization

In the internal combustion engine fuel, kerosene is relatively safe and easy to store and transportwith its high flash point and poor evaporation. So, the research on kerosene fuel internal combustionengines is of great significance. Foreign research institutions tend to use kerosene ignition enginewhich need to solve the problem of kerosene atomization. Air-assisted atomizer which is developedby Orbital company use aerodynamic of compressed air for Liquid fuel to promote fuel atomization.Its atomization quality is not sensitive for the types of fuel and injection pressure is low. With theseadvantages, air-assisted atomizer injector provides an effective technical approach for the kerosenefuel atomization problem.Access to a large number of foreign literature, patents and on the basis of previous workdone,this paper makes use of CFD numerical analysis and commercial software FLUENT to carry onthe numerical simulation for the atomization characteristics of air-assisted atomizer injector. Thepaper contrast it and spray experiment result in the constant volume bomb. The paper final completesthe simulation analysis of the nozzle atomization characteristics.This paper sets up three-dimensional solid model, geometry model, mathematical model anddetermine the atomization model of the nozzle.This paper simulated numerically steady spray field of air-assisted atomizer when needle valve isfully opened. Flow field and spray field of air-assisted atomizer is theoretical analysis. Operatingparameters and structural parameters of air-assisted atomizer injector on the affect of spraycharacteristics is discussed. The particle size distribution on the downstream section of nozzle outlet isalso discussed.To further analyzing the nozzle spray characteristics, this paper simulated numerically unsteadyspray field of air-assisted atomizer injector. Flow field and spray field of the unsteady spray isanalysis. The spray patterns and experimental images are comparative analysis. This paper finds theplace where the total pressure loss serious from internal injector total pressure distribution image andoptimizes the injector structure. The particle residence time and particle diameter are analysis tofurther master dynamic spray characteristics.