Ingeniería Mecánica

Permanent URI for this collectionhttp://repositorio.uta.edu.ec/handle/123456789/900

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Start date: 2021Subject: search.filters.subject.FLAMA

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    Análisis de parámetros para la mejora de eficiencia en quemadores de tubo radiante de dos pasos
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2025-02) Dávila Zúñiga, Cristian Andrés; Cabrera Anda, Santiago Paúl
    The presence of challenges related to energy efficiency losses, thermal non-uniformity, heat utilization, and increased pollutant emissions leads to limited operation, thus affecting its performance. This research proposes an analysis of thermal and technical parameters influencing the efficiency of a two-pass radiant tube burner through an experimental and analytical approach. Various relevant thermal parameters were analyzed to improve the energy performance of the two-pass radiant tube burner. These parameters include heat transfer mechanisms, flame behavior, air-fuel ratio, preheating of the mixture, and temperature distribution, the latter of which was analyzed using advanced thermal analysis software. The description of technical features to enhance thermal performance was linked to the analysis and evaluation of the experimental prototype. An air-to-air heat exchanger was incorporated while maintaining the same pressure settings for air and fuel. Measurement tools such as thermographic cameras and anemometers were used to support the evaluation of alternatives. Thermodynamic calculations, heat transfer, performance, and efficiency analyses were conducted for two configurations: with ambient temperature oxidant and with preheated air. As a result, the two-pass radiant tube burner’s performance increased from 8.66 to 17.15 percent, and the air temperature inside the heat exchanger rose from 20 to 40 degrees Celsius. Additionally, the flame behavior improved from being irregular and elongated with oscillations to becoming a uniform, compact, and controlled flame.
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    Análisis de la combustión de un quemador de gas tipo Venturi con premezcla del Laboratorio de Energía de la Facultad de Ingeniería Civil y Mecánica utilizando simulación CFD mediante el software ANSYS Fluent
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-04) Quinga Hernández, Jefferson Xavier; Cabrera Anda, Santiago Paúl
    In this experimental work the combustion process of the Venturi Burner of the Energy Laboratory of the Faculty of Civil and Mechanical Engineering is analyzed by means of CFD simulation using the finite volumes method, from a 3D model in CAD software, with volume extraction for mesh discretization, a 2D external domain was finally generated for flame simulation. It was carried out in three stages, in which the first is the generation of mesh geometry and discretization, this was evaluated with the Skewness method, in the second stage the simulations are performed according to different input conditions. The third stage comprises the validation of results. The mesh metric results were values close to zero, suitable for the simulations. High efficiency values were obtained as the speed of the outside air increases, these results are validated with a flame intake using thermography. The shape of the flame was compared, reaching relative errors of less than five percent in terms of isotherm areas. In terms of perimeters and lengths, the error value increased to a value close to ten percent. The maximum temperature reached in the combustion process was from 900 to 1044 Kelvin degrees, where the best efficiency was reached with an isotherm area of 700 Kelvin degrees of 0.047 square meters corresponding to a length of 0.64 meters and a composition air gas from 47 to 53 at the beginning of the mixing zone with a relative position x equal to 0.085 meters.