Research On Thermal Load Characteristics Of Piston Based On Fluid-Structure Coupled Heat Transfer

Abstract

In order to study the thermal load characteristics of piston, the temperature field of piston is predicted based on fluid solid coupling heat transfer numerical simulation. A numerical model for the coupled heat transfer of a piston is established. The top surface of the piston, the bottom of the combustion chamber, is used as the coupling surface of the fluid and the solid, and the fluid mechanics software FLUENT is used to simulate the heat transfer. By comparing the calculated cylinder pressure with the experimental data, the correctness of the spray combustion simulation is verified. Comparing the temperature distribution of piston at different time, the results show that the transient temperature field of piston can be obtained directly by the fluid solid coupling method, which reflects the transient change of the temperature field of the piston. For the whole piston, the temperature fluctuation of the coupling surface defined in this paper is larger, the temperature fluctuation in other places is smaller. The flow field in the combustion chamber has a certain effect on the temperature field of the piston, where the direct contact with the gas has a greater impact, and the place where it does not directly contact with the gas has less influence.