LAUSR

An experimental investigation of multihole gasoline direct injection sprays at high injection pressures in a quiescent test chamber is carried out. A multihole injector with six injection holes and 60° spray cone angle is used for this purpose. High-speed Mie-scattering and high-speed Schlieren visualisations are used to characterise vapour penetration, liquid penetration, spray angle and velocity under typical engine high load and low load conditions. Variations of chamber conditions are also investigated in order to assess the effects of chamber temperature, density and pressure on the spray characteristics. The important chamber parameters are identified which affect the performance of multihole injectors in spark ignition engines.