Diseño y análisis de un sistema de refrigeración por aire para un cabezote de un motor mono cilíndrico bajo condiciones ambientales locales, por el método de volúmenes finitos.

Abstract

The development of the titling project was based on the analysis and design of a new model headstock fins by a finite volume method for a cylindrical engine that works ideally under local ambient temperatures. For the development of the geometrization process, we proceeded to perform the design modeling in the SOLIDWORKS software to import it into ANSYS WORKBENCH, so start the simulation in the Fluent (Fluid Flow) and Steady-State Thermal modules to optimize the headstock fin temperature. At the start of the simulation, the headstock geometry is imported, generating the CFD mesh to control the mesh index, which must be within the range of the Skewness and Orthogonal Quality mesh criteria. The extreme local conditions were taken into account to perform the temperature calculations of each fin model, that is, the parabolic, triangular, broad rectangular and thin rectangular; by means of the calculation of the geometric factor, the analysis of convection, conduction, effectiveness, and efficiency by performing three analyzes on each fin of the original model. According to the geometric factor result, efficiency, effectiveness and temperature reduction it was determined that the optimal configuration of the front and ventral fins are those that had an ideal thermal behavior of 115.6 C. That produced a better cooling system in the engine and a fast reach of the thermal balance, improving the power and the torque due to a suitable viscosity of the oils. With the ideal model, the manufacturing codes (G) were obtained using the NX software, the diameter of the milling cutters was obtained, achieving favorable results for the job. It is recommended that this type of head be machined using appropriate tools handling previously determined parameters to reduce the machining time through better CNC machine settings.