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首页> 外文期刊>Applied Energy >Experimental study of the relationship between injection rate shape and Diesel ignition using a novel piezo-actuated direct-acting injector
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Experimental study of the relationship between injection rate shape and Diesel ignition using a novel piezo-actuated direct-acting injector

机译：新型压电驱动直动式喷油器喷射速率形状与柴油点火之间关系的实验研究

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摘要

Injection rate shaping is one of the most attractive alternatives to multiple injection strategies; however, its implementation has been for long time impeded by limitations in the injector technology and therefore, the experimental information available in the literature about this topic is lacking. In this work, a novel prototype common-rail injector featuring direct control of the nozzle needle by means of a piezo-stack (direct-acting) allowed a fully flexible control on the nozzle needle movement and enabled the implementation of alternative injection rate shapes typologies. This state of the art injector, fitted with a 7-hole nozzle, was tested at real engine conditions studying the spatial-temporal evolution of CH~* and OH~* chemiluminescence intensity produced by the fuel combustion. A wide test matrix was performed in an optically accessible hot-spray test rig to understand the influence that partial needle lift and alternative injection rate shapes have on the Diesel ignition The results showed that alternative injection rate profiles have a substantial impact on the ignition event affecting the premixed phase of the combustion and the location where the ignition takes place. Moreover, the results proved that the modifications in the internal flow caused by the partial needle lift are reflected on the ignition timing: although partial needle lift and injection pressure have similar effects on the mass flow rate, in the first case, the ignition delay is reduced, while in the second, the combustion is delayed as a consequence of a different spray development.
机译：注入速率整形是多种注入策略的最有吸引力的替代方法之一。然而，由于喷射器技术的局限性，它的实施已长期受到阻碍，因此，缺乏有关该主题的文献中提供的实验信息。在这项工作中，一种新颖的原型共轨喷射器具有通过压电堆栈直接控制喷嘴针（直接作用）的能力，从而可以对喷嘴针的运动进行完全灵活的控制，并能够实现其他喷射速率形状类型。这种配备7孔喷嘴的先进喷油嘴在实际发动机条件下进行了测试，研究了燃料燃烧产生的CH〜*和OH〜*化学发光强度的时空演变。在光学可访问的热喷涂试验台上进行了广泛的测试，以了解部分针头升程和替代喷射率形状对柴油机点火的影响。结果表明，替代喷射率曲线对点火事件产生了重大影响燃烧的预混阶段和点火发生的位置。此外，结果证明，部分升针引起的内部流量变化在点火正时上得到反映：尽管部分升针和喷射压力对质量流量有相似的影响，但在第一种情况下，点火延迟为减少燃烧，而第二次燃烧则由于不同的喷雾发展而延迟。

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