Thermal Effects on Diesel Engine Piston and Piston Compression Rings

Abstract

This paper introduces an analytical study on the thermal effects on the diesel engine piston and its compresion rings during the contact between the piston and its compression rings .A three dimensional finite element model is built for the piston and its compression rings using the ANSYS v. 8 Finite Element Analysis Code that serves all engineering problems. The thermal analysis is made using contact case between the piston and its compression rings .The work in this paper did not include a convergence study. The study includes the effects on the piston and piston compression rings of the thermal conductivity of piston material , and the contact area .The conclusions of this study are that the material type of high thermal conductivity is considered better than the material type of low thermal conductivity. This means that the aluminum alloy is considered better than the cast-iron alloy, and tapering the compression rings from the inner side by 1 mm , leads to a reduction in the temperature values by 1.6% , 0.84% and 0.37% compared to rectangle compression rings. ‫ﺍﻟﺩﻴﺯل‬ ‫ﻤﺤﺭﻙ‬ ‫ﻟﻤﻜﺒﺱ‬ ‫ﺍﻟﻀﻐﻁ‬ ‫ﺤﻠﻘﺎﺕ‬ ‫ﻭ‬ ‫ﻤﻜﺒﺱ‬ ‫ﻋﻠﻰ‬ ‫ﺍﻟﺤﺭﺍﺭﻴﺔ‬ ‫ﺍﻟﺘﺄﺜﻴﺭﺍﺕ‬ ‫ﺍﻟﺨﻼﺼﺔ‬ ‫ﻴﻘﺩﻡ‬ ‫ﺍﻟﺩﻴﺯل‬ ‫ﻟﻤﺤﺭﻙ‬ ‫ﺍﻟﻀﻐﻁﻴﺔ‬ ‫ﺤﻠﻘﺎﺘﻪ‬ ‫ﻭ‬ ‫ﻤﻜﺒﺱ‬ ‫ﻋﻠﻰ‬ ‫ﺍﻟﺤﺭﺍﺭﻴﺔ‬ ‫ﺍﻟﺘﺄﺜﻴﺭﺍﺕ‬ ‫ﻋﻥ‬ ‫ﺘﺤﻠﻴﻠﻴﺔ‬ ‫ﺩﺭﺍﺴﺔ‬ ‫ﺍﻟﺒﺤﺙ‬ ‫ﻫﺫﺍ‬ ‫ﺤﺎﻟﺔ‬ ‫ﺨﻼل‬ ‫ﺭﻴﻜﺎﺭﺩﻭ‬ ‫ﻨﻭﻉ‬ ‫ﺍﻟﻀﻐﻁ‬ ‫ﺤﻠﻘﺎﺕ‬ ‫ﻭ‬ ‫ﺍﻟﻤﻜﺒﺱ‬ ‫ﺒﻴﻥ‬ ‫ﺍﻟﺘﻼﻤﺱ‬. ‫ﻤﻥ‬ ‫ﻨﻤﻭﺫﺝ‬ ‫ﺒﻨﺎﺀ‬ ‫ﺘﻡ‬ ‫ﺤﻴﺙ‬ ‫ﺍﻟﻬﻨﺩﺴﻴﺔ‬ ‫ﺍﻟﻤﺴﺎﺌل‬ ‫ﺘﺤﻠﻴل‬ ‫ﺒﺭﻨﺎﻤﺞ‬ ‫ﺒﺈﺴﺘﺨﺩﺍﻡ‬ ‫ﺍﻟﻀﻐﻁ‬ ‫ﺤﻠﻘﺎﺕ‬ ‫ﻭ‬ ‫ﻟﻠﻤﻜﺒﺱ‬ ‫ﺍﻻﺒﻌﺎﺩ‬ ‫ﺜﻼﺜﻲ‬ ‫ﺍﻟﻤﺤﺩﺩﺓ‬ ‫ﺍﻟﻌﻨﺎﺼﺭ‬ ‫ﺍل‬ ‫ﺍﻟﻤﺤﺩﺩﺓ‬ ‫ﺍﻟﻌﻨﺎﺼﺭ‬ ‫ﺒﻁﺭﻴﻘﺔ‬) ANSYS (‫ﺍﻟﺘﻼﻤﺱ‬ ‫ﺤﺎﻟﺔ‬ ‫ﺒﺈﺴﺘﺨﺩﺍﻡ‬ ‫ﹸﻔﺫ‬ ‫ﻨ‬ ‫ﺍﻟﺤﺭﺍﺭﻱ‬ ‫ﺍﻟﺘﺤﻠﻴل‬ ،) Contact (‫ﺍ‬ ‫ﺒﻴﻥ‬ ‫ﺍﻟﻀﻐﻁﻴﺔ‬ ‫ﺤﻠﻘﺎﺘﻪ‬ ‫ﻭ‬ ‫ﻟﻤﻜﺒﺱ‬ ‫ﺘﻘﺭﻴﺒﻴﺔ‬ ‫ﺩﺭﺍﺴﺔ‬ ‫ﻴﺘﻀﻤﻥ‬ ‫ﻟﻡ‬ ‫ﺍﻟﺒﺤﺙ‬ ‫ﻫﺫﺍ‬ ‫ﻓﻲ‬ ‫ﺍﻟﻌﻤل‬ ،. ‫ﺍﻟﺘﻭﺼﻴﻠﻴﺔ‬ ‫ﻨﺎﺤﻴﺔ‬ ‫ﻤﻥ‬ ‫ﻟﻠﻤﻜﺒﺱ‬ ‫ﺍﻟﻀﻐﻁ‬ ‫ﺤﻠﻘﺎﺕ‬ ‫ﻭ‬ ‫ﺍﻟﻤﻜﺒﺱ‬ ‫ﻋﻠﻰ‬ ‫ﺍﻟﺘﺄﺜﻴﺭﺍﺕ‬ ‫ﺍﻟﺩﺭﺍﺴﺔ‬ ‫ﺃﺤﺘﻭﺕ‬ ‫ﺍﻟﺘﻼﻤﺱ‬ ‫ﻤﺴﺎﺤﺔ‬ ‫ﺘﺄﺜﻴﺭ‬ ‫ﻭ‬ ، ‫ﺍﻟﻤﻜﺒﺱ‬ ‫ﻟﻤﻌﺩﻥ‬ ‫ﺍﻟﺤﺭﺍﺭﻴﺔ‬. ‫ﺍﻟﻤﺎﺩﺓ‬ ‫ﻨﻭﻉ‬ ‫ﺒﺄﻨﻪ‬ ‫ﺍﻟﺒﺤﺙ‬ ‫ﻫﺫﺍ‬ ‫ﻓﻲ‬ ‫ﺍﻻﺴﺘﻨﺘﺎﺠﺎﺕ‬ ‫ﺃﻜﺩﺕ‬ ‫ﺍﻟﺘ‬ ‫ﺫﺍﺕ‬ ‫ﺍﻟﺘﻭﺼﻴﻠﻴﺔ‬ ‫ﺫﺍﺕ‬ ‫ﺍﻟﻤﻜﺒﺱ‬ ‫ﺘﺼﻨﻴﻊ‬ ‫ﻓﻲ‬ ‫ﺍﻟﻼﺯﻤﺔ‬ ‫ﺍﻟﻤﺎﺩﺓ‬ ‫ﻤﻥ‬ ‫ﺍﻓﻀل‬ ‫ﺘﻌﺘﺒﺭ‬ ‫ﺍﻟﻌﺎﻟﻴﺔ‬ ‫ﺍﻟﺤﺭﺍﺭﻴﺔ‬ ‫ﻭﺼﻴﻠﻴﺔ‬ ‫ﺤﻠﻘﺎﺕ‬ ‫ﺘﺘﺒﻴﺭ‬ ‫ﻜﺫﻟﻙ‬ ، ‫ﺍﻟﺯﻫﺭ‬ ‫ﺤﺩﻴﺩ‬ ‫ﺴﺒﻴﻜﺔ‬ ‫ﻤﻥ‬ ‫ﺍﻓﻀل‬ ‫ﺍﻻﻟﻤﻨﻴﻭﻡ‬ ‫ﺴﺒﻴﻜﺔ‬ ‫ﻤﻌﺩﻥ‬ ‫ﻴﻌﻨﻲ‬ ‫ﻫﺫﺍ‬ ، ‫ﺍﻟﻭﺍﻁﺌﺔ‬ ‫ﺍﻟﺤﺭﺍﺭﻴﺔ‬ ‫ﺒﻤﻘﺩﺍﺭ‬ ‫ﺍﻟﻌﻠﻴﺎ‬ ‫ﺍﻟﺯﺍﻭﻴﺔ‬ ‫ﻋﻨﺩ‬ ‫ﺍﻟﺩﺍﺨﻠﻲ‬ ‫ﺍﻟﺠﺎﻨﺏ‬ ‫ﻤﻥ‬ ‫ﺍﻟﻀﻐﻁ‬ 1 ‫ﺍ‬ ‫ﺩﺭﺠﺎﺕ‬ ‫ﻓﻲ‬ ‫ﺇﻨﺨﻔﺎﺽ‬ ‫ﺇﻟﻰ‬ ‫ﻴﺅﺩﻱ‬ ‫ﻤﻡ‬ ‫ﻟﺤﺭﺍﺭﺓ‬ ‫ﺍﻟﻤﻜﺘ‬ ‫ﺍﻟﺘﻼﻤﺱ‬ ‫ﺤﺎﻟﺔ‬ ‫ﺨﻼل‬ ‫ﺍﻟﻤﻜﺒﺱ‬ ‫ﻤﻥ‬ ‫ﺴﺒﺔ‬ ‫ﺒﻨﺴﺒﺔ‬ ‫ﻭ‬ 1.6 % ، 0.84 % ‫ﻭ‬ 0.37 % ‫ﻤﻘﺎﺭﻨﺔ‬ ‫ﺒﺤﻠﻘﺎﺕ‬ ‫ﺍﻻﻋﺘﻴﺎﺩﻴﺔ‬ ‫ﺍﻟﻀﻐﻁ‬ .