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Experimental Investigation of Injection Pressure Fluctuations Employing Alternative Fuels
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
Engine efficiency is significantly linked to the spray development, characteristics of which are affected by injection setting, fuel properties and pressure fluctuations taking place in the injection system. Concerning the pressure oscillations, this phenomenon determine appreciable deviations from the expected mass flow rate, leading to non-uniformity of the spray development as well as affecting the A/F ratios. Furthermore, once injector is triggered, it occurs that rail pressure is decreasing because of these oscillations. Therefore, non-stationary trend of pressure pulsations frequently prevents the injection strategy to be set when overpressure arises within the rail. This has urged the research community to design several predictive models and devices developed to minimize or even to eliminate such fluctuations. However, a thorough analysis of pressure wave propagation within injection system represents even nowadays a challenging issue. Additionally, the urgent compliance with the emissions legislation has shifted the attention of the research community to the alternative fuels, which may represent a potential pathway for the sustainable mobility. This scenario has motivated the authors to carry out a robust experimental campaign devoted to assess time histories of the injection pressure fluctuations employing diesel and alternative fuels. The paper provides a further insight into the correlation between the injection settings, fuel properties and pressure wave arising at commencing injection event.