Influence of Combustion Condition and Air-Fuel Charge Rotation on Intensity of Heat Transfer in an IC Engine Operating on Gas Fuel

In the Heat Engineering Chair of Poznan University of Technology, there have been investigations carried out for the last 10 years, of heat transfer processes on the wall of a single action internal combustion engine. Investigations of local heat transfer coefficients were carried out in different combustion conditions and the engine was propelled with a methanecarbon dioxide mixture (65% of CH4 and 35% of CO2). There were changes of the timing, the excess air number (λ = 1,05 ÷ 1,3), and charge rotation. The authors investigated its influence on intensity of heat transfer in the single action internal combustion engine. The motion of the piston, the surface temperature of the chamber wall and pressure in the combustion chamber were recorded using a digital acquisition system. Then the transient heat flux from combustion gases to the wall was calculated, by solving numerically the unsteady inverse onedimension heat conduction problem. The authors observed a significant influence of the excess air number, ignition timing and the way of combustion mixture preparation on the process of heat transfer in the combustion chamber. Time dependent plots of heat flux to the wall are presented in fig. 2.