Combustion optimization method of natural gas engine cooperating with vortex

The invention discloses a combustion optimization method for a natural gas engine in cooperation with vortex. The method comprises the following steps that basic engine data are obtained; establishing a three-dimensional CFD simulation model coupled with detailed chemical kinetics of the basic engine; the in-cylinder vortex ratio and the in-cylinder vortex motion expressed by the velocity vector are obtained through CFD calculation; performing optimization design on an included angle A of an ignition fuel injection axis and a natural gas injection axis on a top view plane by combining in-cylinder flow characteristics; a simulation model is reconstructed for the newly-designed engine, CFD calculation is carried out, and the combustion duration and the engine heat efficiency are compared with the basic engine; and the process is repeated, optimization calculation is conducted for multiple times, and the optimal included angle A for achieving rapid diffusion combustion of the engine is determined ...