Numerical Study of a Wall-Impinging jet on a Flat Plate

In direct injection gaseous fueled engines and during their homogeneous combustion mode, mixture formation is controlled by impinging of fuel jet on piston crown, hence, study of impinging jets can improve development of this type of engines. In the present work, a numerical model for simulating helium impinging jet behavior, injecting in an open environment was conducted by using Ansys Fluent software and validated using existing experimental results. The validated numerical model then was used to study the effects of Pressure ratio, engine rpm and injection timing on methane-air mixture formation in EF7 direct injection engine. Results showed that SST k-ω turbulence model predicts the impinging jet penetration depth much better than k-ε model. Also jet tip penetration would increase with increasing the pressure ratio, but decreases with increasing engine rpm unlike the injection in atmospheric condition. Our study showed that the injection timing can affect the jet penetration, depending on the other engine conditions such as pressure ratio or engine rpm.
In direct injection gaseous fueled engines and during their homogeneous combustion mode, mixture formation is controlled by impinging of fuel jet on piston crown, hence, study of impinging jets can improve development of this type of engines. In the present work, a numerical model for simulating helium impinging jet behavior, injecting in an open environment was conducted by using Ansys Fluent software a