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An Optical Characterization of the Effect of High-Pressure Hydrodynamic Cavitation on Diesel

机译:高压水力空化对柴油影响的光学表征

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摘要

Most modern high-pressure common rail diesel fuel injection systems employ an internal pressure equalization system in order to provide the force necessary to support needle lift, enabling precise control of the injected fuel mass. This results in the return of a substantial proportion of the high-pressure diesel back to the fuel tank. The diesel fuel flow occurring in the injector spill passages is expected to be a cavitating flow, which is known to promote fuel ageing. The cavitation of diesel promotes nano-particle formation through induced pyrolysis and oxidation, which may result in deposit formation in the vehicle fuel system. ududA purpose-built high-pressure cavitation flow rig has been employed to investigate the stability of unadditised crude-oil derived diesel and a paraffin-blend model diesel, which were subjected to continuous hydrodynamic cavitation flow across a single-hole research diesel nozzle. Continuous in-situ spectral optical extinction (405 nm) has been employed to identify, determine and measure variations in fuel composition as a function of the cavitation duration.ududThe results of two high-pressure diesel cavitation experiments are reported. The first dealt with the effect of injection pressure on the rate of induced variation in chemical composition of diesel, and concluded that faster degradation of the fuel occurred at higher pressure.ududThe second experiment involved an investigation into the variation in composition occurring in diesel fuel and the paraffin-blend model diesel, subjected to cavitating flow over a longer duration. Observed differences suggest that the high-pressure cavitation resulted in hydrodynamic sono-chemical destruction of aromatics in the diesel, which is believed to lead to carbonaceous nano-particle formation.
机译:大多数现代高压共轨柴油机燃油喷射系统采用内部压力平衡系统,以提供支撑针提升所需的力,从而能够精确控制喷射的燃油量。这导致大部分高压柴油返回燃油箱。出现在喷油器溢流通道中的柴油流应被认为是空化流,这已知会促进燃料老化。柴油的空化作用通过诱导的热解和氧化作用促进了纳米颗粒的形成,这可能导致车辆燃油系统中形成沉积物。 ud ud已使用专门建造的高压空化流动装置来研究未加油的原油衍生柴油和石蜡混合模型柴油的稳定性,这些柴油在单孔研究柴油中经受连续的水力空化流动喷嘴。连续原位光谱消光(405 nm)已被用于识别,确定和测量与气蚀持续时间有关的燃料成分变化。 ud ud报道了两次高压柴油气蚀实验的结果。第一个实验研究了喷射压力对柴油化学成分的诱导变化率的影响,并得出结论,在较高压力下,燃料的降解速度更快。 ud ud第二个实验涉及对柴油中化学成分变化的研究。柴油和石蜡混合型柴油,在较长的时间内会发生空化流。观察到的差异表明,高压空化会导致柴油中芳烃的流体动力学声波化学破坏,这被认为导致了碳纳米颗粒的形成。

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