Cai, TaoZhao, DanJiaqiang, E.2020-09-152020-09-152020Cai T, Zhao D, Jiaqiang E (2020). Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen. Chemical Engineering and Processing - Process Intensification. Volume 153, July 2020, 1079790255-2701https://hdl.handle.net/10092/101035combustor fueled with premixed ammonia/oxygen using three-dimensional numerical simulations. For this, a three-dimensional model is developed with a detailed chemical kinetic mechanism. The effects of 1) the presence/ absence of the bluff-body, 2) its dimensionless height h and 3) its dimensionless axial location l are examined. It is found that the implementation of a bluff-body can significantly affects the thermal and NO emission characteristics. Up to 39.1 % reduction of NO formation and 41.6 K increase in the outer wall temperature (OWT) can be achieved as the bluff-body is optimized, when compared to the case in the absence of the bluff-body. Furthermore, increasing h leads to OWT being increased, but it can suppress the NO generation in some cases. In addition, increasing l is shown to be involved with a high OWT and a low NO concentration, mainly due to the variation in the flow field and thus heat transfer characteristics. Finally, the dimensionless pressure loss is strongly affected by the NH3 flow rate, and the dimensionless parameters h and l. This work reveals that implementing a proper designed bluff-body is an effective way to enhance thermal performance and reduce NOx emission.enAll rights reserved unless otherwise statedNOx emissionAmmoniaBluff-bodyMicro-combustionThermal performanceDimensionless pressure lossJournal Article2020-06-04Fields of Research::40 - Engineering::4004 - Chemical engineering::400402 - Chemical and thermal processes in energy and combustionhttps://doi.org/10.1016/j.cep.2020.107979