Parametric Assessment of Changing Inlet Air Swirl Intensity on flow Dynamic Behavior, Temperature and Radiation Heat Flux of Harwell Furnace

In this study, changing of inlet air swirl intensity of standard Harwell combustion chamber on dynamic flow, temperature, radiation heat flux and NO pollutant has been assessed. Due to the effect of swirling on dynamic behavior, a new equation has been utilized based on tangential and axial velocity component in order to achieve the swirl number. Furthermore, chemical reactions computation has been done using Eddy Dissipation model and flow computation and radiation heat flux were performed using standard k-ɛ and P1 models. The results show that increasing swirl number from 0.0 to 0.6 with amplification of internal recirculation zone of furnace will cause the combustion products into this area and mix air and fuel and accordingly, increase the combustion efficiency by eliminating the high temperature points as a main cause of NO generation. Moreover, increasing the swirl number in radial order and increasing the heat exchange area regardless of the maximum flame temperature reduction, will increase the flux radiation efficiency by 31.3% and reduce the NO pollutant by 58.6%.