The present application relates to
nozzle structure design and liquid film separation optimization technical field, specifically, the present application relates to a kind of
nozzle structure optimization method of
methanol direct injection engine, the present application aims at solving the problem that the fixed
radius of chamfer of the outlet of the orifice of traditional
nozzle cannot be adjusted dynamically with the inherent
surface roughness of the outlet edge, which leads to the real-time
viscosity fluctuation of
methanol, and affects the
power performance of engine.The
surface roughness of the outlet of the orifice is quantified by atomic force
microscope nanoscale scanning, combined with the
viscosity of
methanol under different
working temperature, a
dynamic mapping table is constructed by numerical
simulation to match the correction coefficient of liquid film
contact angle, the
viscosity of methanol is determined according to real-time temperature and the correction coefficient is queried, the liquid film adhesion compensation value is calculated by
algorithm model, the design size of the chamfer
radius of the outlet of the orifice is adjusted dynamically, the chamfer
radius control is realized by using pulse
laser ablation technology combined with real-time monitoring, the viscosity and roughness change are adapted, the uniformity of liquid film separation is improved, and the
combustion efficiency is optimized.