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• W317622163 abstract "Swirling flows are widely used to stabilize the flame reaction zone and to provide enhanced mixing of the axial fuel flow with air swirl. The goal of the present paper is to investigate the influence of the air swirl on the formation of the flame reaction zone at thermochemical conversion of the pelletized biomass. An experimental study of the swirl effects on the combustion dynamics is carried out providing the complex measurements of the formation of the flame temperature and composition profiles at different stages of thermochemical conversion of biomass pellets along with estimation of the effect of the swirl level on the mixing of the axial flow of volatiles with air swirl determining the thermochemical conversion of biomass. The numerical simulation of the swirl flow formation is used to analyze the results of the experimental measurements. The present study has been performed to determine the effect of air swirl on the flow development and on combustion dynamics at thermochemical conversion of biomass pellets. In many combustion processes the flame is stabilized using swirling air supply that allows effective mixing of the flame compounds completing fuel combustion. The fundamental experimental and theoretical study of swirling flows has shown that the centrifugal force created by the air swirl motion plays an important role in the formation of the flame structure and stability with the peak values of axial and tangential mean velocities near the channel wall (1-3). One of the most important features of the swirling flame is the formation of a recirculation zone inside of which the reverse axial mass transfer of the hot products helps heat and ignite the incoming fuel flow that makes it possible to stabilize the process of fuel combustion. In non-premixed combustors, where the fuel and air flows are injected separately the formation of the recirculation zone provides enhanced turbulent mixing of the axial fuel flow with the air swirl along the outer boundary layer of the recirculation region, where the turbulent shear stress achieves its maximum value (4). In fact, despite the wide practical applications of swirl-stabilized combustors, the development of combustion dynamics of non-premixed flame flows is not clearly understood. Moreover, a lot of problems arise when providing control of combustion dynamics at thermochemical conversion of biomass because of a variety of processes developing at their thermochemical conversion which includes steps of biomass heating, drying, volatilization, ignition and combustion of volatiles depending on the swirling air supply rate and on the air excess ratio in the flame reaction zone. Analytical prediction of the combustion dynamics at thermochemical conversion of biomass pellets still is highly limited because of the complexity of the flow and many factors determining the swirl flow formation at biomass thermo-chemical conversion, whereas numerical simulation of the flow dynamics is quite difficult. Therefore, a detailed experimental study of the formation of swirl flow dynamics is highly important in order to understand the behavior of non- premixed combustor, predict combustion dynamics and provide active control of the swirl flow formation. Because the main aim of the present study is to investigate the influence of the air swirl motion on the formation of the flame reaction zone at thermochemical conversion of pelletized biomass (wood pellets) detailed measurements of the formation of the flow structure and composition with specification of the inlet conditions of fuel and air determining the formation of the primary mixing region are required. To predict the formation of swirling flame dynamics with the specification of the inlet conditions, the formation of the primary isothermal mixing region was numerically simulated at different primary and secondary air supply rates providing comparison of the results of numerical simulation and experimental study of the swirl flow formation. The formation of the flow structure at thermo-chemical conversion of biomass pellets was investigated experimentally considering the effect of the air swirl motion on the formation of the recirculation zone induced by the swirling flow pattern in the vicinity of the fuel jet outlet that is produced due to the gasification of biomass pellets." @default.
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• W317622163 date "2013-01-01" @default.
• W317622163 modified "2023-09-28" @default.
• W317622163 title "Combustion dynamics at biomass thermochemical conversion downstream of integrated gasifier and combustor." @default.
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