Swirler geometry effects (Dh /do ratio) on synthetic gas flames: Part 1: Combustion and emission characteristics; [Suktuvo geometrijos (Dh /do ) poveikis sintetinių dujų liepsnoms. 1 dalis: degimo ir emisijų charakteristikos]

Swirling flows increase combustion performance via favour-ing flame stability, pollutant emissions, and combustion in-tensity. The strength of a swirling flow is characterized by a parameter known as swirl number, which is highly related to the dh /do ratio. In this study, effects of the swirler dh /do ratio on combustion and emission characteristics of the synthetic gas flames of premixed 20%CNG/30%H2 /30%CO/20%CO2 mix-ture were experimentally investigated in a laboratory-scale swirl stabilized combustor. For this purpose, twelve different swirl generators were designed and manufactured. dh /do ratios of these swirlers were set as 0.30 and 0.50, and the geometric swirl number was varied between the values of 0.4 and 1.4 (at 0.2 intervals). All experiments were conducted at a fuel-lean equivalence ratio (ϕ = 0.6), room temperature, and local at-mospheric conditions of the city of Kayseri, Turkey. A data logger was utilized to plot axial and radial temperatures and NOx, CO, and CO2 profiles, which were exploited to assess combustion and emission performance. Results showed that the dh /do ratio had a non-monotonic effect on the behaviour of combustion and emission of the tested synthetic gas mix-ture. Depending on the swirl number, increments and dec-rements were observed in temperature and emission values. ENERGETIKA. 2021. T. 67. Nr. 1–2. P. 48–54 © Lietuvos mokslų akademija, 2021.