EFFECT OF AXIAL SWIRLER PARAMETERS ON A METHANE- AIR COMBUSTI CHARACTERISTICS AND FORMATION OF NITROGEN OXIDE

Анотація

 CFD simulation of none premixed methane air combustion is performed. The purpose of this paper is to provide information concerning the effect of geometry of axial swirler vanes on the exhaust gas emissions of evades of nitrogen (NO), for a can combustor of gas turbine engine. Effects of different swirier vane angles on NO formation, are shorn. Air mirier adds sufficient skirting to the inlet flow to generate central recirculation region (CRZ) which is necessary for flame stability and air-fuel mixing enhancement. Therefore designing an appropriate air mirier is a challenge to produce stable, efficient and low emission of combustion with low pressure losses. Five axial flat vane swirlers with 20°,30°,45°,55° and 60" vane angle corresponding to swirl number of 0.28.0.444. 0.769, 1.1 and 1.33 respectably, were used in this analysis to show vane angle effect on the internal flow field, temperature fluctuations and formation of NO. The simulation has been performed using the Computational Fluid Dynamics (CFD) commercial code ANSYS CFX release 16, including laminar flamelet model, for simulating the methane combustion mixing with air
k -e model was also investigated to predict the turbulent combustion reaction. A thermal and prompt NOx formation is performed for predicting NO emission characteristics.

Key words: