Numerical investigation of a novel micro combustor with a central and bilateral slotted blunt body

To improve the combustion stability at micro scale, the micro combustor with a central and bilateral slotted blunt body (MCSB) exhibiting significant combustion performance improvement is designed. The new one can not only effectively prevent the flame tip opening, but also exhibit higher combustion efficiency and blown-off limit. Its blown-off limit can reach 756 cm(3)/s at the flow rate ratio of 0.2 and the bluff body angle of 90 degrees, which is 61.5% higher than that of the conventional one with the blown-off limit of 468 cm(3)/s. The combustion efficiency improves with the growth of the flow rate ratio, while the blown-off limit of MCSB increases first and then decreases. The blown-off limit of MCSB with the bluff body angle of 90 degrees reaches to the peak value of 792 cm(3)/s at the flow rate ratio of 0.15. Moreover, the increase of the bluff body angle provides better combustion efficiency and stability. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The newly designed MCSB, with a central and bilateral slotted blunt body, shows significant improvement in combustion performance by effectively preventing flame tip opening and exhibiting higher combustion efficiency and blown-off limit. The blown-off limit of MCSB can reach up to 756 cm(3)/s at a flow rate ratio of 0.2 and a bluff body angle of 90 degrees, which is 61.5% higher than that of conventional combustors.