Maestría en Física Aplicada
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Item Modelo paramétrico de fluidos para gases de combustión de un motor a gasolina extra(Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Física Aplicada, 2022) Gavilanes Sani, Jorge Anibal; Hidalgo Díaz, Víctor HugoThe present investigation is focused on the simulation of Computational Fluid Dynamics (CFD) of the combustion gases in an extra gasoline engine using the Ansys software. As a first step, the selection of the input parameters was carried out in order to investigate if they have any influence on the production of combustion gases such as carbon monoxide (CO), carbon dioxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO2) and unburned hydrocarbons (HNC). Once both the input and output parameters were selected, the levels of each input parameter were established in order to create treatments based on the experimental design (DOE) and building a 3 factorial design with a total of 9 treatments without repetition to proceed. The next step was to use the geometry of the combustion chamber that the software itself provides, build the areas of interest using the Design modeler software, perform the mesh considering meshes in more detail in areas of interest such as the spray and the ignition point using Meshing Autodine software. In the third step, the Navier Stokes equations were solved using the 𝑘 - 𝜀 (RNG) Re-Normalisation Group turbulence model in conjunction with the fuel injection chemistry and the fuel injection model. The last step consists of setting the simulation environment when selecting the ignition model for modeling the turbulence of the flame, defining the boundary conditions and the start of the combustion chamber. The procedure detailed in the previous paragraph was carried out for the 9 treatments proposed by the factorial design and once each of the simulations had been completed, the results obtained during the combustion process that occurred between the angles were analyzed and interpreted. piston displacement from 720 to 740 Crank Angle (CA).Item Modelo paramétrico que representa la generación de gomas en un inyector de motor de cuatro tiempos alimentado por gasolina extra y eco país(Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Física Aplicada, 2022) Delgado Rodríguez, Sivananda Salmanazar; Hidalgo Díaz, Víctor HugoThis research work quantifies the formation of gums in the injector of a gasoline engine. The model, based on the chemical kinetics’ laws, needs pressure curves, temperature, injector temperature, nitrogen oxide concentration, nitrogen monoxide concentration and fuel leakage, with reference to the rotation angle of the crankshaft for an engine cycle, obtained through the engine simulation using Ansys program and the values estimated by literature review. Chemical kinetics is implemented by using a Python code. The analysis is applied with an experimental design of 2^2 , in which the fuel (Extra and Ecopaís) and the injector temperature (T=150 𝑜 𝐶 y T=190 𝑜 𝐶) are varied. The results revealed that the formation of gums is 0.105 [𝜇𝑀/ciclo] for (Extra y T=150 𝑜𝐶), 0.096 [𝜇𝑀/ciclo] for (Ecopaís y T=150 𝑜𝐶), 0.04 [𝜇𝑀/ciclo] for (Extra y T=190 𝑜𝐶), and 0.038 [𝜇𝑀/ciclo] for (Ecopaís y T=190 𝑜𝐶). Formation of gums is greater for Extra fuel than for Ecopaís one, regardless of the temperature of the injector. The variance analysis, the F-statistic=308 higher than the F Critical=161, allows to conclude that temperature is the influential factor in the formation of gums and, their formation is inversely proportional to the injector temperature, without being affected by the type of fuel.