Optimización de la cámara de combustión del motor Qingqi a gasolina cuatro tiempos monocilíndrico 150cc mediante un estudio CAE y construcción de su cabezote aplicando las herramientas CAD/CAM

Abstract

This project aims to optimize the combustion chamber of an MCIA modifying its geometry and also the inlet and exhaust ports. By carrying out a CAE analysis and also the manufacture of its head. Initially, the airflow performance was analyzed using CFD and when interacting with the geometry of the head during a complete cycle of the engine without combustion. To determine in this way, the modifications to be implemented. It was decided to increase the inclination of the inlet port at 21° after analyzing the results of the CFD simulation to provide uniformity to the geometry of the chamber combustion. And generate an exhaust port with horizontal tendency thus improving the formation of macrostructures in the flow to have a more air-fuel mixture homogeneous and thereby improve the combustion process. Subsequently, thermal and structural simulations were performed to determine if the modified head supports the functioning conditions. Then, the head was fabricated using CAD / CAM tools. Finally, experimental tests were carried out on the original and modified head to determine variations in fuel consumption and polluting gas emissions after the redesign. A MAHA MET 6.3 gas analyzer was used for the emission measurement and a variable resistance programmed with an ARDUINO using LabVIEW for monitoring fuel consumption, where it was determined that the modified header has higher emissions and lower fuel consumption compared to the original. MAHA MET 6.3 gas analyzer was used for the emission measurement and a variable resistance programmed with an ARDUINO using LabVIEW for monitoring fuel consumption, where it was determined that the modified header has higher emissions and lower fuel consumption compared to the original. It is concluded that the geometry of the combustion chamber and inlet and exhaust ports are directly related to the mixture formation and combustion quality. Experimental tests are recommended by applying load to the motor to determine how the parameters vary engine running.