IJE TRANSACTIONS A: Basics Vol. 28, No. 10 (October 2015) 1525-1532   

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H. Golbakhshi, M. Namjoo and E. Raeisi Estabragh
( Received: July 25, 2015 – Accepted: October 16, 2015 )

Abstract    The purpose of this paper is to evaluate the effect of different methods for improving the temperature gradient of a specified gasoline engine piston. With a robust FE based software, 3D thermal analyses have been carried out for the piston model. Unlike previous studies, the effects of both fully and locally ceramic layers on the crown top surface were considered. It was found that a fully ceramic layer provides just 10-15% more thermal protection. The effects of thermal dam and lubricating oil temperature on crown and skirt surfaces were then separately investigated. Using these methods, the maximum surface temperature of the piston was greatly improved and the temperature distribution of piston skirt was effectively controlled.


Keywords    Piston, FEM, Thermal analysis, Coating layer, Thermal dam.


چکیده    به منظور بهبود و بهینه سازی شرایط حرارتی کارکرد پیستون یک موتور احتراق داخلی بنزینی، شبیه سازی سه بعدی دقیقی از هندسه نسبتاً پیچیده آن انجام شده و به کمک روش تحلیل عددی قدرتمند اجزاء محدود مورد بررسی حرارتی قرار گرفته است. بر خلاف تحقیقات پیشین، در مطالعه حاضر تأثیر هر دو نوع پوشش سرامیکی کلی و جزئی روی سطح فوقانی پیستون بر دمای تاج آن برآورد گردید. طبق نتایج به دست آمده، پوشش کلی تنها 15-10 درصد حفاظت حرارتی بیشتری ایجاد نمود. نقش ایجاد سد حرارتی در کاهش دمای دامنه پیستون نیز تحلیل شد. نتایج حاصل از این تحلیل به خوبی گواه این واقعیت بودند که با اجرای این اصلاحات، دمای نواحی مهمی نظیر تاج پیستون و دامنه آن به خوبی کنترل می­شوند.



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