Abstract
Abstract This study is to investigate the spray behavior of DME-LPG blended fuels in common rail injection system for die-sel engines. The visualization experiment was performed to analyze the macroscopic spray behavior of test fuels. Inaddition, the experiment using BOS(Background Oriented Schlieren) method is performed to compare liquid phase andgas phase. The test fuels are injected in high pressure chamber. The ambient pressure of high pressure chamber wasformed by nitrogen gas. Spray tip penetration, spray cone angle and spray area were measured using high speed cam-era. SMD(Sauter Mean Diameter) and spray particle velocity were measured using the PDPA(Phase Doppler ParticleAnalyzer) system to analyze the microscopic properties of test fuels. The results of this experiment showed that spraytip penetration, spray cone angle and spray area of DME-LPG fuels are similar to those of DME fuel. When comparedto results of experiment using BOS, significant differences of spray tip penetrations, spray cone angle and spray areaare showed because of gas phase. The results of experiment using BOS method showed higher values. SMD of DME-LPG blended fuels is smaller than that of DME fuel. Velocity of DME-LPG blended fuels is faster than that of DMEfuel.
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