Publication: MEDICIONES DE RADIACIÓN TÉRMICA EN UNA LLAMA LAMINAR ESTABLECIDA SOBRE UN ESTRATO FORESTAL
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Date
2018
Authors
FERNÁNDEZ BOLVARÁN, PEDRO LUIS
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Abstract
El presente estudio describe el comportamiento experimental de la radiación térmicaemitida por una llama transiente de difusión laminar originada sobre un estrato de biomasaforestal. Dicho régimen laminar fue establecido por medio de un aparato experimentaldiseñado exclusivamente para ello, el cual permite medir y registrar la radiación térmicaemitida por la llama y sus dimensiones geométricas.El presente trabajo es llevado a cabo dentro del marco de estudio del rol que juega laradiación y las partículas de hollín en la conversión térmica de combustibles forestales. Elobjetivo de aportar información sobre la radiación emitida durante la combustión de lasespecies de Pino y Eucaliptus. Dichas especies fueron idealizadas en dos tamaños departículas, Fino y Grueso, las cuales fueron clasificadas por medio de un filtro tamizador de1 mm^2. Por otro lado, los estratos fueron elegidos en consideración de la representatividadde la vegetación encontrada en bosques y plantaciones forestales chilenas.Los parámetros controlados para las mediciones experimentales fueron, tipo deespecie (PinoPino y Eucaliptus), tamaño de partícula (fino y grueso) y disponibilidad deoxidante (flujo de aire), los cuales fueron establecidos en 40, 60 y 80 L/min.Los resultados obtenidos de los experimentos llevados a cabo para ambas especies indicanque, con respecto a su geometría, la altura de la llama disminuye ante el incremento de flujode disponibilidad de oxidante. Por otro lado, la radiación incidente (flujo radiativo medidopor un radiómetro) mostró un comportamiento directo a la altura de la llama, es decir, susmayores niveles fueron logrados para las alturas de llamas más altas. De mismo modo, laradiación total emitida por la llama muestra un comportamiento análogo a la radiaciónincidente, la cual es una fracción de ella. Los niveles de radiación emitida, en general,alcanzaron sus máximos niveles para tamaño de partícula fino con flujos de disponibilidadde oxidante menores.
The present study describes the experimental behavior of thermal radiation emittedby a laminar diffusion flame originating on a stratum of forest biomass. Said laminar regimewas established by means of an experimental apparatus designed exclusively for it, which, inaddition, allows to measure and record the thermal radiation emitted by the flame and itsgeometric dimensions.This report is carried out within the frame of study of the behavior of fire in forestfires, with the objective of providing information on the radiation emitted during thecombustion of the species of Pine and Eucalyptus. Said species were idealized in two particlesizes, Fine and Coarse, which were classified by means of a sieve filter of 1 mm^2. On theother hand, the strata were chosen in consideration of the representativeness of the vegetationfound in forests and Chilean forest plantations.The parameters controlled for the experimental measurements were type of species(pine and eucalyptus), particle size (fine and coarse) and oxidant availability (air flow), whichwere established at 40, 60 and 80 L / min.The results obtained from the experiments carried out for both species indicate that,with respect to their geometry, the height of the flame decreases with the increase in the flowof oxidant availability. On the other hand, the incident radiation (radiative flow measured bya radiometer) showed a direct behavior at the height of the flame, that is, its higher levelswere achieved for the higher flame heights. In the same way, the total radiation emitted bythe flame shows a behavior analogous to the incident radiation, which is a fraction of it. Thelevels of emitted radiation, in general, reached their maximum levels for fine particle sizewith lower oxidant availability flows.
The present study describes the experimental behavior of thermal radiation emittedby a laminar diffusion flame originating on a stratum of forest biomass. Said laminar regimewas established by means of an experimental apparatus designed exclusively for it, which, inaddition, allows to measure and record the thermal radiation emitted by the flame and itsgeometric dimensions.This report is carried out within the frame of study of the behavior of fire in forestfires, with the objective of providing information on the radiation emitted during thecombustion of the species of Pine and Eucalyptus. Said species were idealized in two particlesizes, Fine and Coarse, which were classified by means of a sieve filter of 1 mm^2. On theother hand, the strata were chosen in consideration of the representativeness of the vegetationfound in forests and Chilean forest plantations.The parameters controlled for the experimental measurements were type of species(pine and eucalyptus), particle size (fine and coarse) and oxidant availability (air flow), whichwere established at 40, 60 and 80 L / min.The results obtained from the experiments carried out for both species indicate that,with respect to their geometry, the height of the flame decreases with the increase in the flowof oxidant availability. On the other hand, the incident radiation (radiative flow measured bya radiometer) showed a direct behavior at the height of the flame, that is, its higher levelswere achieved for the higher flame heights. In the same way, the total radiation emitted bythe flame shows a behavior analogous to the incident radiation, which is a fraction of it. Thelevels of emitted radiation, in general, reached their maximum levels for fine particle sizewith lower oxidant availability flows.
Description
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Keywords
ALTURA DE LLAMA , DISPONIBILIDAD DE OXIDANTE , INCENDIOS FORESTALES , RADIACION EMITIDA , RADIACION INCIDENTE , RADIACION TERMICA