Mecanismo para medir temperatura en la cara del pistón de un motor de combustión interna

Abstract

In this work a simple mechanism is made to do temperature measurements on a piston face of a gasoline engine. Two main tasks are considered, the first accounts all about the mechanism design, and the second deals with the aspects related to surface temperature simulation. The device has several piston heads with surface thermocouples inbeded on each one, two of these devices have a cold junction to allow for heating transfer measurements across the piston head. To investigate the thermal insulation effects on engine power development a ceramic material plate was inserted between the engine piston top and its piston head. Real engine cylinder pressure data taken at 1800 rpm was used to simulate the surface temperature change when metal and ceramic conform the piston head. The one dimensional heat transfer model has a variable source of heat flux as a top border condition and a constant wall temperature on its bottom side. The obtained results agree with others authors experiments. The surface temperature profile shows a suddenly temperature increase according to the engine combustion process into the cylinder.