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Fuel Injection Strategies to Achieve High Evaporation Efficiency of D.I. Diesel Sprays~Effect of Injection Pressure, Nozzle Hole Diameter and Split Injection
Published September 27, 2006 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
From the viewpoint of enhancing evaporation, the Laser Absorption Scattering (LAS) technique was employed to quantitatively characterize the mixture properties in the fuel spray injected by the common rail hole-type injector for D.I. diesel engines under various injection strategies. Two macroscopic parameters, named entrained heat for evaporation and entrained heat for mixing, were proposed and used to evaluate the injection behavior in the analyses. As a result, it is clarified that increasing injection pressure and smaller nozzle hole diameter generate more heat entrainment, and correspondingly enhance evaporation. In the case of split injection, the liquid phase penetration is obviously reduced, and the mass of entrained ambient gas markedly increases compared with the single injection due to the "mixing effect," which is helpful to form a leaner and more homogeneous fuel-air mixture.