In order to guide the nozzle design and performance verification,the flow characteristics of fuel in the aeroengine fuel atomization nozzle were numerically simulated.Through the complete modeling and grid generation of the nozzle from the oil supply pipeline to the main and auxiliary nozzles outlet,the pressure drop of fuel in different parts was obtained by calculation,the flow loss of fuel in different parts was analyzed,and a nozzle flow rate prediction model was established.The results show that for the oil in the main and auxiliary oil pipelines,friction loss mainly occurs due to the friction; in the inner core of the main and auxiliary oil circuit valve,the bottom cup of the main oil circuit,the vortex box,the front of the auxiliary oil circuit nozzle and other parts,local resistance loss mainly occurs due to the sudden change of the sectional area.Both cause pressure drop with different degrees.By establishing the relationship between the geometrical parameters of key parts and the flow loss,the nozzle flow prediction model was derived according to the conservation of mechanical energy and the continuity equation.By comparing the experimental data under different oil supply pressure and different critical geometric parameters,the accuracy of the theoretical prediction model is verified,which can be well applied to the design and verification of nozzle flow rate.