Combustion and thermal characteristics of a miniature double-layer disc-combustor with porous media and Swiss-roll preheated channel. (5th March 2023)

• Record Type: Journal Article
• Authors: Cai, Siqi; Su, Ziyi; Xie, Pengfu; Zeng, Qinghua; Wan, Jianlong
• Is Part Of: Chemical engineering science. Volume 267(2023)
• Publication Date: 2023-03-05
• Subjects: Micro combustion -- Radial channel -- Heat recirculation -- Porous media -- Flame behavior; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2022.118356
• Languages: English
• ISSNs: 0009-2509

Abstract

Highlights: A novel miniature double-layer disc-combustor with heat recirculation is developed. Combustion characteristics of 60%CH4 –40%H2 -air premixed mixture are studied. Some novel flame behaviors are found by the means of experiments. Anomalous blow-off is firstly found experimentally in the micro radial channel. Thermal performance of the present double-layer disc-combustor is studied. Abstract: A novel miniature double-layer disc-combustor with porous media and Swiss-roll preheated channel is developed for the first time, which can act as a heater or the miniature heat source for the miniature power source. The combustion characteristics of 60%CH4 -40%H2 -air in this combustor are investigated by the means of experiment. The result shows that the flame blow-off limit increases first and then decreases with the decreased Reynolds number Re value. It is the first time to observe the anomalous blow-off phenomenon in the radial channel. The flame can always remain stable until the flame extinguishes. Unexpectedly, at a constant Re value, the flame diameter slightly decreases with the decreased equivalence ratio, which is mainly caused by the thermal expansion effect. In summary, the present double-layer disc-combustor can run well in a wide operating range and its thermal performance is good.