Effect of Induced Voltage on Spray Characteristics of Piezo Actuated Diesel Injector

Abstract: A piezo-driven injector was applied with a purpose to evaluate the effect of induced voltage on spray characteristics. For this, injection rate, macroscopic imaging, ambient gas entrainment and particle sizing were carried out. It was shown that initial slope of injection rate was steeper as induced voltage increased, while slope of injection rate became mostly constant with fully opened needle. From macroscopoic imaging, longer spray tip penetration was produced with higher induced voltage. Moreover, wider spray angle was detected in the early stage of spray development, when higher induced voltage was applied. Ambient air entrainment rate was increased and particle size was reduced with higher induced voltage. Key words: Piezo-actuated injector(피에 조 인젝터), Injection rate(분사율), Macroscopic images(거시적이미지), Ambient gas entrainment rate(주변공기유입율), Droplet size(입자크기