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The purpose of this study is the experimental investigation of Soybean oil Methyl Ester  (SME) and DiMethyl Ether (DME) spray characteristics injected through the common-rail  injection system under various ambient pressures. A high pressure chamber that can be  pressurized up to 4 MPa was utilized for a change of ambient pressure. In order to compare  the spray development and atomization characteristics, the images of SME and DME were  obtained by using a high speed camera with two metal halide lamps under various ambient  pressures in the spray chamber. From these spray images, the spray characteristics such as  the spray penetration from the nozzle tip, maximum radial distance, and spray diameter  were measured and analyzed. In addition, the Sauter Mean Diameter (SMD) of two fuels under  ambient pressure was analyzed using the droplet measuring system. It was revealed that the  axial distance of spray from the nozzle tip of the SME spray is longer than that of DME  spray under same injection condition. The axial penetration, maximum radial distance, and  spray diameter decreased when the ambient pressure in the chamber increased. As the  ambient pressure increased, the SMD decreased and the DME spray showed a superior  atomization performance compared to the SME spray.Le but de cette étude est l’investigation expérimentale de l’effet de diverses pressions  ambiantes sur les caractéristiques des sprays (issus d’un système "common rail") de  methylester d’huile de soja (SME) et de dimethyléther (DME). La pression ambiante dépend  de la chambre et sa valeur la plus haute peut monter jusqu’à 4 MPa. Pour comparer le  développement de spray et la caractéristique d’atomisation, des images de spray de SME et  DME à différentes pression ambiantes sont obtenues avec une caméra à haute vitesse à deux  lampes de métal halide. Les caractéristiques du spray, comme la pénétration, la distance  radiale maximale et le diamètre de spray, sont mesurées et analysées. De plus, le diamètre  de Sauter (SMD) des deux carburants à différentes pressions est mesuré. On a constaté que,  dans les mêmes conditions, la distance de pénétration du spray de SME est supérieure à  celle du spray de DME. La pénétration axiale, la distance radiale maximale et le diamètre  du spray décroissent quand la pression ambiante croît. Quand la pression ambiante croît,  le SMD décroît et le spray de DME montre plus d’atomisation que celui de SME

A Comparison of Effects of Ambient Pressure on the Atomization Performance of Soybean Oil Methyl Ester and Dimethyl Ether Sprays