Combustion process and entropy generation in a novel microcombustor with a block insert

•A novel micro combustor with block insert is presented in this work.•The block can significantly increase the mean wall temperature.•The block can improve the uniformity of the wall temperature distribution.•The entropy generation due to various processes has been presented.

A novel micro combustor with block insert has been introduced in this work. The effect of block insert on wall temperature distribution and entropy generation of the micro combustor is investigated. The results indicate that the employment of a block insert can significantly increase the mean wall temperature and improve the uniformity of temperature distribution along the wall. When the gap length is 4.2 mm, the micro combustor can produce the highest mean wall temperature with the lowest entropy generation.