摘要
以缸径为200 mm的某型号天然气发动机活塞为研究对象,采用高硅铝和球墨铸铁600两种材料,使用有限元法对此活塞的温度场进行了仿真分析。比较了在相同热边界条件下两种活塞头的温度分布,以及在各自温度场下的热应力和热变形,并计算了在15 MPa活塞顶面压力下的热机耦合应力及热机耦合变形。计算结果表明,采用铸铁活塞能承受更高的爆压,还能改善发动机的HC排放。
A piston of a CNG engine with a diameter of 200 mm was investigated,using high silicon alumininm and ductile iron 600 two materials. The thermal field of the piston model was simulated with FEM（Finite Element Method）. Temperature distribution, as well as thermal stress and thermal deformationof piston ＇head with both materials were analyzed under the same thermal boundary conditions. In addition, the thermal-mechanical coupling stress and thermal-mechanical coupling deformation were calculated whenpeak pressure of 15 MPa exerted on piston top. The results showed that piston made of ductile iron can withstand higher peak pressure, while improving HC emissions.
出处
《内燃机》
2015年第3期39-41,45,共4页
Internal Combustion Engines
关键词
活塞
有限元
温度场
热变形
piston
FEM
temperature field
thermal deformation
