ПОРІВНЯЛЬНИЙ АНАЛІЗ ЗАКОНОМІРНОСТЕЙ ТЕЧІЇ ЗА ІЗОТЕРМІЧНИХ УМОВ І ГОРІННЯ В МІКРОФАКЕЛЬНИХ ПАЛЬНИКАХ З БАГАТОРЯДНОЮ ПАЛИВОПОДАЧЕЮ

• Date: 2025
• Main Authors: Fialko, N.M., Klishch, A., Sherenkovskyi, Ju., Meranova, N., Aloshko, S., Gladkov, D.
• Format: Article
• Language: Ukrainian
• Published: Institute of Engineering Thermophysics of NAS of Ukraine 2025
• Online Access: https://ihe.nas.gov.ua/index.php/journal/article/view/641
• Journal Title: Thermophysics and Thermal Power Engineering

The article presents the results of a comparative analysis of isothermal and nonisothermal flow characteristics in stabilizer-type burners with three-row fuel feed, designed for operation at variable excess air ratios. CFD modeling using the FLUENT software package was used as the research method. Simulation experiments were performed using the DDES approach with the Realizable k-є turbulence model. The modeling results revealed significant differences in the flow patterns for the compared situations. These differences include, in particular, the location of high-velocity zones in different regions of the channel. It is shown that the velocity behind the flame stabilizers is generally significantly higher during combustion due to flow acceleration caused by thermal expansion of the gases. This acceleration is found to begin downstream, the farther the gas supply openings are from the stall edge. Particular attention is paid to comparing the characteristics of recirculation zones in the aft region of flame stabilizers, which are responsible for stabilizing the combustion process, for isothermal and nonisothermal flow conditions. It is shown that the extent of these zones increases during combustion, while the maximum absolute velocity values within them decrease. Results are also presented for comparing velocity pulsation fields in the burner devices under study for reacting flows and isothermal flow. It is established that the level of these pulsations during combustion generally significantly exceeds the corresponding level for isothermal flow. The results of these studies can be widely used in selecting the design and operating parameters of the proposed burners.