Browsing by Autor "Carlos Gilberto Villamar Linares"

Now showing 1 - 3 of 3

Características del proceso de combustión en un motor CFR de gasolina
(2006) María de Jesus Martín Valera; Jesús Omar Araque Maldonado; Carlos Gilberto Villamar Linares
The deleterious of the environment is caused by the wasting of the natural energy sources together with its indiscriminate use. The heavy duties are done by machines where the energy transformation into the engine combustion chamber should be obtained with maximum efficiency. It means looking for the solution to problems like: pollution control, reduce excessive heat lost, reduce the incomplete combustion, improve engine instabilities and reduce parts motor damage. The fuel air variation due to fluctuations on the fuel and air supply appears to be as the main problems which modify the combustion process on SIE. New fuel systems working with electronic devices have been used on SIE trying to work out these problems, however due to the instability, not predictable and complex characteristic of the combustion process the cyclic variation among the engine cycles is still there. An improvement on the engine working conditions when fuel air ratios are close to unity is reached although the fuel economy decrease and the pollution agents increase. Experimental pressure with different mixture richness obtained in a CFR engine is used to find out some criteria to analyze its influence on the cyclic pressure variation. The following parameters: pmi, s(pmi), (Dp) j, pmax vs j(D pmax) as a function of crank angle degree were studied found a better combustion process with lightly rich mixtures.
Modelado Energético y Exergético para el Estudio del Ciclo Brayton
(2013) Carlos Gilberto Villamar Linares; Rafael José Santos Luque; Alirio Rondón; Yoel Valera
In this work is presented a model for determining the main parameters of the Brayton cycle, and perform energy and exergy analysis. The model uses a calculation method based on thermodynamic equations, specifically, conservation of mass, First and Second Law of Thermodynamics, which can determine the quantity, quality and energy degradation during processing. It is considered that the working fluid behaves as an ideal gas and that their composition and their properties such as specific heat, which are a function of temperature and composition, change throughout the cycle due to the combustion process. From the results it can be concluded that the studied fuel that produces more power, less fuel consumption and enables higher exergetic efficiency, is methane, getting with this a reduction in carbon dioxide emissions. Comparing the behavior of air Brayton cycle with the cycle that uses various fuels, we can see that the operating parameters have a similar behavior, the conclusion is that the assumption made in the initial studies of the thermodynamics of Brayton cycle operates only air with constant specific heats and only with heat transfer processes without combustion, is valid, the advantage of using this assumption greatly simplifies the analysis of the cycle in the early involvement of Thermodynamics, which allows to focus on basic operation with a considerable reduction in the complexity of the calculations.
Programa de simulación de ciclos termodinámicos de plantas de vapor
(Universidad Autónoma del Estado de México, 2007) C.T. Araque Mogollón; Juan Ruiz; María Alma Bracho; Carlos Gilberto Villamar Linares
"En este trabajo se desarrolló un programa que permite analizar los principales índices de funcionamiento de las plantas de vapor, tales como potencias, calores y eficiencias, así como las propiedades termodinámicas en las entradas y salidas de cada dispositivo que conforma el ciclo bajo estudio. Para ello se empleó una base de datos de las propiedades termodiná- micas del agua y las ecuaciones de: Primera Ley de la Termodinámica, continuidad, eficiencia térmica, eficiencia isentró- pica y eficiencia de la planta. Adicionalmente el programa permite realizar estudios paramétricos con el fin de visualizar cómo se ven afectados los principales índices de operación al modificar el valor de una variable. Los resultados obtenidos con el programa concuerdan satisfactoriamente con los arrojados por programas comerciales y con los cálculos manuales, obteniendo discrepancias menores a 0.47%, lo que le confiere un alto grado de confiabilidad. El programa diseñado tiene la ventaja de que no requiere la programación de las ecuaciones del ciclo a estudiar, condición indispensable en los paque- tes comerciales empleados como medios de validación. El presente trabajo se desarrolló como proyecto de grado para op- tar al título de Ingeniero Mecánico."