Complex network analysis of a premixed swirling flame influenced by precessing vortex core

Author:

Ren YongzhiORCID,Wang QiuxiaoORCID,Guan YuORCID,Xia XiORCID,Qi FeiORCID

Abstract

This work investigates the influences of precessing vortex cores (PVCs) on the coherent interactions in the transient flow and heat release fields of a weak premixed swirling flame, based on a 10-kHz simultaneous measurement of OH* chemiluminescence and stereoscopic particle image velocimetry together with the state-of-the-art vortical and heat release rate (HRR) network analyses. The PVC effect is studied by contrasting the lifted helical and attached symmetric states of a unique transitioning V-shaped flame, corresponding to an alternate quasi-periodic appearance and disappearance of PVC in the inner shear layer (ISL). The results suggest that the emergence of PVC significantly escalates the coherent oscillation in the ISL, leading to the break of the scale-free topology in the vortical network. However, the PVC also promotes coherence in the local HRR variation, resulting in improved connectivity in the positive HRR network and enhanced assortative mixing in the negative HRR network. Furthermore, the flame mode transition is also captured by the differences in the mean degree of the positive HRR network and the power-law fitting goodness of the negative HRR network, showing promises of complex network analysis in distinguishing the flame dynamical modes.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

Reference72 articles.

1. TAPS: A fourth generation propulsion combustor technology for low emissions,2003

2. Forced ignition of turbulent spray flames;Proc. Combust. Inst.,2017

3. Review of modern low emissions combustion technologies for aero gas turbine engines;Prog. Aerosp. Sci.,2017

4. Combustion instability of a lean premixed prevaporized gas turbine combustor studied using phase-averaged PIV;Combust. Flame,2014

5. Development of the GE aviation low emissions TAPS combustor for next generation aircraft engines,2012

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3