Thermal analysis of cylinder block with different number of fins and tilt angles in an air-cooled motor bike engine
Author(s):
Shivendra Kumar Dubey, Shailesh Gupta, Rohit Sahu
Keywords:
Cylinder blocks, fin, temperature drop, heat flux
Abstract
The heat transfer rate in an engine is dependent on the coolant temperature and the engine size, among other variables. There are complex interactions between the various engine parameters. For example, as the temperature of the engine coolant decreases, the heat transfer to the coolant will increase, and the combustion temperature will decrease. This will cause a decrease in the combustion efficiency and an increase in the volumetric efficiency. It will also cause an increase in the thermal stresses in the cylinder sleeve, and increase the size of the radiator needed, since the coolant ambient temperature difference will decrease. The formation of nitrogen oxides will decrease, and the oxidation of hydrocarbons will decrease. The exhaust temperature will also decrease, causing a decrease in the performance of the catalytic converter and a turbocharger.
In the present work the cooling characteristics of air-cooled cylinder blocks, with various fin pitches and number of fins, mounted at tilt angles at 0° (vertical), with the speed of motor bike varies as 20km/h (5.6m/s) to 60km/h (16.7m/s) including the value of 40km/h (11.11 m/s) . A numerical analysis has been carried out. The 3D modelling of cylinder block with different configurations keeping fin size and number of fins same designed on space claim and the analysis has been carried out using ANSYS fluent as design tool. The two variables temperature drop and heat flux are considered as decision making criterion.
