Experimental investigation of thermal protection performance of bluff-body flameholder in augmented combustor under air jet cooling

Yuqian Chen, Yuxin Fan and Qixiang Han

Energy, 2022, vol. 254, issue PB

Abstract: The wall temperature distribution and cooling effectiveness are crucial characteristics for evaluating air-cooled flameholder. Previous works show significantly changed flow and flame features in the near-wake region when inhaled cooling air jets, indicating that the flame and wall interaction is complex under the cooling jets and needs further investigation. Therefore, the present study focuses on identifying the effects of aerodynamic conditions on the cooling performance of the air-cooled flameholder. Experiments of wall temperature measurement are performed in a simplified augmented combustor. The typical flow and flame features are adopted to interpret the wall temperature distribution. Results show that the wall temperature rapidly decreases and becomes more uniform after added cooling air. Under the given conditions, the highest wall temperature is below 982 K, and the maximum wall temperature range is within 220 K. Enhancing blowing ratio and decreasing cooling air temperature are beneficial for improving the cooling effectiveness. Furthermore, increasing the equivalence ratio and mainstream velocity are helpful to improve cooling efficiency, although increasing the mean wall temperature. Interestingly, increasing the mainstream temperature (within 1000 K) slightly decreases cooling efficiency. Nevertheless, when the mainstream temperature reaches 1100 K, the cooling efficiency dramatically decreases due to the premixed fuel autoignition.

Keywords: Flameholder; Thermal protection; Air cooling; Wall temperature; Cooling efficiency (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544222011392
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:254:y:2022:i:pb:s0360544222011392

DOI: 10.1016/j.energy.2022.124236

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().