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Experimental assessment of ignition characteristics of lubricating oil sprays related to low-speed pre-ignition (LSPI)
International Journal of Engine Research ( IF 2.5 ) Pub Date : 2021-04-29 , DOI: 10.1177/14680874211013268
Bernardo Tormos 1 , José M García-Oliver 1 , Marcos Carreres 1 , Carlos Moreno-Montagud 1 , Beatriz Domínguez 2 , María Dolores Cárdenas 2 , Fermín Oliva 2
Affiliation  

Low-speed pre-ignition (LSPI) remains one of the challenges of Direct Injection (DI) Spark Ignition (SI) engines due to its potential to induce a heavy knock. Several mechanisms have been identified in the literature as plausible causes for LSPI. The physical and chemical properties of lubricant oils play a role on some of these causes. The present work aims at getting an independent procedure to determine the proneness of lubricant oils to ignite. To this end, the ignition delay (ID) of different oil formulations is experimentally determined in a constant-pressure flow facility through two different optical techniques: Schlieren and OH* chemiluminescence imaging. The investigation explores the effect of base-stock formulation, oil specification quality level, different additive types content, aging, and oxidation on oil reactivity for several thermodynamic conditions. Differences in ignition delay were found among base stocks, correlating with the American Petroleum Institute (API) group classification. However, no significant differences were found among additive packages previously reported to yield different LSPI occurrences. Hence, differences in reactivity among lubricating oil formulations are not the determining factor explaining their different LSPI occurrences in an engine. Similarly, specific lubricant additive content, aging, and oxidation do not importantly modify the measured ignition delay.



中文翻译:

与低速预点火(LSPI)相关的润滑油喷雾点火特性的实验评估

由于低速预点火(LSPI)可能引起严重的爆震,因此仍然是直接喷射(DI)火花点火(SI)发动机的挑战之一。在文献中已经确定了几种机制,可能是导致LSPI的原因。润滑油的物理和化学性质在其中一些原因中起作用。目前的工作旨在获得一种独立的程序来确定润滑油的着火倾向。为此,通过两种不同的光学技术在恒压流动设备中通过实验确定了不同机油配方的点火延迟(ID):Schlieren和OH *化学发光成像。该调查探索了基础油配方,机油规格质量水平,不同添加剂类型的含量,陈化,在几种热力学条件下对油反应性的氧化和氧化。在基础油之间发现了点火延迟的差异,这与美国石油协会(API)的组分类相关。但是,以前报道会产生不同LSPI发生的添加剂包装之间没有发现显着差异。因此,润滑油配方之间的反应性差异不是解释它们在发动机中发生不同LSPI的决定因素。同样,特定的润滑剂添加剂含量,老化和氧化也不会重要地改变测得的点火延迟。在先前报道产生不同LSPI发生的添加剂包装之间,没有发现显着差异。因此,润滑油配方之间的反应性差异不是解释它们在发动机中发生不同LSPI的决定因素。同样,特定的润滑剂添加剂含量,老化和氧化也不会重要地改变测得的点火延迟。在先前报道产生不同LSPI发生的添加剂包装之间,没有发现显着差异。因此,润滑油配方之间的反应性差异不是解释它们在发动机中发生不同LSPI的决定因素。同样,特定的润滑剂添加剂含量,老化和氧化也不会重要地改变测得的点火延迟。

更新日期:2021-04-30
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