NDLI: Improving Micro Combustor Stability With External Heating

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhou, Zhijun Wang, Yang Yang, Weijuan Zhou, Junhu Liu, Jianzhong Wang, Zhihua Cen, Kefa
Copyright Year	2009
Abstract	Heat loss is the key factor to micro combustor stability. In this experiment, a quartz-glass micro combustor with inner diameter of 2 mm is tested with wind sweeping over its surface. The wind temperature is adjusted from 4 to 728 °C to control the combustor heat loss. According to the experimental results, the combustor stability increases with the wind temperature. Take 0.2 L/min as an example, the equivalence ratio at stability limit is 0.652–3.96 with 4 °C wind, and extends to 0.540–12.0 with 107 °C wind. Computational fluid dynamic simulation reveals that hotter wind intensifies the reaction, thus reaction temperature and OH concentration increase accordingly. Moreover, hotter wind enhances the heat recirculation, which causes shift upstream of flame. Increasing flow rates also inhibits extinction. But the quenching mode transforms from extinction to blowout, while the flow rate exceeds about 0.28 L/min. In the rich cases, hot wind with higher temperature aggravates blowout, which is opposite to the lean cases. According to the experimental phenomenon, the reaction region locates close to the inlet in the rich cases, where the flow velocity increases dramatically. Therefore, the imbalance between flow velocity and burning velocity causes blowout.
Sponsorship	Nanotechnology Institute
Starting Page	175
Ending Page	180
Page Count	6
File Format	PDF
ISBN	9780791843901
DOI	10.1115/MNHMT2009-18047
e-ISBN	9780791838648
Volume Number	ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2
Conference Proceedings	ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer
Language	English
Publisher Date	2009-12-18
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Heat recirculation External heat loss Micro combustor Hydrogen External heating Heat Stability Combustion chambers Heating Heat losses
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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