Abstract:
This paper presents a study on the thermal distribution at cylinder head region of a dedicated compressed natural
gas (CNG) engine using the analytical Finite Element Method approach. The construction of the 3D model is
mainly focuse on the cylinder head. The component includes water jackets, oil gallery, intake port and exhaust
port. The fuel type is Compressed Natural Gas (CNG). Internal nodal temperature of cylinder head body is taken
as approximately 2327°C to represent occurrence of CNG combustion. The presence of the cooling action is
modeled by assigning convection coefficient on the cooling jacket.
Material information and its isotropic
properties is set as default comprises of the general material data that is used in ANSYS 14.0. The transient heat
transfer analysis is carried out at the instant of combustion. The computed temperature gradient at the crucial
parts were plotted and analysed. Based on simulation result, the thermal distribution in the cylinder head is high
where the location of the high thermal stress on the cylinder head is mostly spreading around the combustion
chamber and the exhaust port. This means that the metal fatigue occur in the effect area.
