Publicación: Producción de hollín en una llama laminar de difusión bajo modulación temporal de inyección de combustible
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2024-10-22
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info:eu-repo/semantics/openAccess
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Universidad Nacional de Educación a Distancia (España), Universidad de Concepción - Chile. Departamento de Ingeniería Mecánica
Resumen
Este estudio experimental investiga una llama laminar no premezclada y axisimétrica, con inyección forzada de combustible, enfocándose en la fracción de hollín y la temperatura durante su ciclo de pulsación. Utilizando la configuración ISF-4 (condición B) del International Sooting Flames, se aplicaron forzamientos sinusoidales, de rampa y una modificación de esta última al 40% de modulación a 20 Hz. Las velocidades del perfil se obtuvieron mediante Velocimetría por Imágenes de Partículas (PIV). Se midió la fracción de hollín y la temperatura a través de técnicas de atenuación de línea de visión (LOSA) y emisión a 800 nm. Los resultados muestran que la modulación afecta la velocidad de inyección y la producción de hollín, con la forma de rampa disminuyendo la producción en comparación con la sinusoidal. La temperatura varía ligeramente, destacando la forma de rampa en algunas fases del ciclo.
An experimental study of a non-premixed, axisymmetric laminar flame with forced fuel injection was conducted to evaluate the soot volume fraction and temperature throughout the phases of its periodic pulsation cycle. The configuration corresponds to the ISF-4 flame, co-flow 6 - condition B of the International Sooting Flames (ISF), generated with a Yale-type burner [1]. The flame was forced at 40% modulation at 20 Hz, using sinusoidal, ramp, and a modification of the ramp waveforms. Profile velocities were determined using Particle Image Velocimetry (PIV). Line of Sight Attenuation (LOSA) measurements and flame emission at a wavelength of 800 nm were performed to obtain the soot volume fraction and local soot temperature. The PIV technique was used to determine the effect of the forcing waveform on the velocity profiles at the Yale burner outlet. The results show stable fuel forcing based on the modulation of the forcing signal amplitude, producing an injection velocity variation of 40-90 cm/s for the studied flame, with a Reynolds number of 89 to 322 and a Froude number of 1.5 to 20.9. Soot emission shows an increasing trend during the pulsation cycle for the sinusoidal forcing flame (1.3 ppm). For the ramp waveform, the flame follows a similar trend to the sinusoidal but decreases soot production due to increased fuel injection velocity (0.9 ppm), leading to a higher reaction rate. Regarding temperature, variations of about 5% are observed in the average fields; however, these differences are not substantial except in specific phases of the pulsation cycle, where the ramp waveform presents higher values than the sinusoidal.
An experimental study of a non-premixed, axisymmetric laminar flame with forced fuel injection was conducted to evaluate the soot volume fraction and temperature throughout the phases of its periodic pulsation cycle. The configuration corresponds to the ISF-4 flame, co-flow 6 - condition B of the International Sooting Flames (ISF), generated with a Yale-type burner [1]. The flame was forced at 40% modulation at 20 Hz, using sinusoidal, ramp, and a modification of the ramp waveforms. Profile velocities were determined using Particle Image Velocimetry (PIV). Line of Sight Attenuation (LOSA) measurements and flame emission at a wavelength of 800 nm were performed to obtain the soot volume fraction and local soot temperature. The PIV technique was used to determine the effect of the forcing waveform on the velocity profiles at the Yale burner outlet. The results show stable fuel forcing based on the modulation of the forcing signal amplitude, producing an injection velocity variation of 40-90 cm/s for the studied flame, with a Reynolds number of 89 to 322 and a Froude number of 1.5 to 20.9. Soot emission shows an increasing trend during the pulsation cycle for the sinusoidal forcing flame (1.3 ppm). For the ramp waveform, the flame follows a similar trend to the sinusoidal but decreases soot production due to increased fuel injection velocity (0.9 ppm), leading to a higher reaction rate. Regarding temperature, variations of about 5% are observed in the average fields; however, these differences are not substantial except in specific phases of the pulsation cycle, where the ramp waveform presents higher values than the sinusoidal.
Descripción
Organizado y patrocinado por: Federación iberoamericana de Ingeniería Mecánica y Universidad de Concepción - Chile. Departamento de Mecánica, FeIbIm – FeIbEM
Categorías UNESCO
Palabras clave
Llama laminar no premezclada, producción de hollín, temperatura de hollín, velocidad de partículas por imágenes, Non-premixed laminar flame, soot production, soot temperature, particle image velocimetry
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E.T.S. de Ingenieros Industriales
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Mecánica