Simulation of Diesel Engine Intake Premixed Methanol with Different Injection Modes
Using the Eulerian gas equation and Lagrangian drop equation,a simulation model of intake injecting methanol for a diesel engine with helical port-valve-cylinder was proposed.The model consists of liquid droplet break-up,evaporation,collision and coalescence,as well as wall interaction of liquid droplets and wall film separation and valve seat liquid expelling.Methanol and air mixing process for methanol injected into the engine intake port was simulated to guide the methanol/diesel dual fuel engine modification.Bench test of the dual fuel engine shows that the cylinder pressure of model calculation is good agreement with that of experiment.Methanol injection timing directly affects the cyclic amount of methanol into cylinder.Methanol injection during inlet valve closed will be more readily atomized and mixed in the induction stroke.Methanol injection orientation is determined by the principle of decreasing methanol film on cold wall.Methanol concentration in cylinder is stratified more obviously in cylinder axis direction than that in cylinder radial direction.