Study on the Influence of Injection Pressure on Spray Characteristics for GDI Engine
Spray characteristics have very important effect on the mixture formation and combustion perfor-mance for GDI engine.This paper studies the influence of injection pressure of 5MPa,17 MPa and 30 MPa on spray flow quantity,penetration,spray angle,Sauter mean diameter SMD and drop point distribu-tion for GDI engine by the constant volume chamber.The results show that,with the increase of injection pressure,the flow quantity will increase gradually,development speed of spray penetration will accelerate,but the trend will slow later because of resistance.Spray angle is not mainly influenced by injection pres-sure,the Sauter mean diameter SMD will decrease obviously and the spray is more uniform.
Injection pressureSauter mean diameter SMDFlow quantityPenetrationSpray angle
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