Experimental observations of engine piston damage induced by knocking combustion

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• 作者：Lorella Ceschini^a ; ^{lorella.ceschini@unibo.it} ; Andrea Morri^a ; Eleonora Balducci^a ; Nicolò ; Cavina^a ; Nahuel Rojo^a ; Lucio Calogero^b ; Luca Poggio^b
• 关键词：Al-Si-Cu-Mg alloy ; Engine piston ; Damage ; Abnormal combustion ; Knock ; Pre-ignition
• 刊名：Materials & Design
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：114
• 期：Complete
• 页码：312-325
• 全文大小：4623 K
• 卷排序：114

文摘

Dedicated facilities and processing algorithms were adopted to study the in-cylinder pressure signal, allowing a classification of the knocking level experienced by the Al alloy pistons. Visual and optical microscopy analyses are useful techniques to qualitatively determine the level of knocking combustions undergone by the pistons. Wear traces, carbon deposits, erosion, melting and seizure were detected on the top lands by means of SEM-EDS analyses.Hardness measurements give a quantitative evaluation of Al alloy piston damage well related to the in-cylinder pressure-based knock index.