Abstract
To understand working features of a micro-tube combustor, combustion of CH 4/O 2 was carried out in three types of micro-tubes with the same outer diameter of 3 mm. In the tests, combustion characteristics and heat loss in micro-tubes were studied. It is shown that when equivalence ratio was lower than unity, CH 4 was not completely oxidized and a great amount of gas H 2 and CO was produced, which lowered the combustion heat release. If equivalence ratio is a little larger than unity, CH 4 was completely oxidized to gas CO 2 and water vapor, and the reaction released the maximum combustion heat. Meanwhile, heat loss of the tube wall was the largest. Heat loss of the stainless steel tube occupied 22% of the heat release at most. Since the wall emissivity of stainless steel tube was larger than that of ceramic tube, radiative heat loss was very large and the most occupied 70% of the total heat loss. Additionally, because thermal conductivity of ceramic was less than that of stainless steel, temperature gradient along axis was larger than that of stainless steel tube, which was disadvantageous to axis heat transfer and flame stabilization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
