Experimental study on phase transfer of longitudinal mode combustion oscillations in bluff body diffusion flames

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2025-02-03 DOI:10.1016/j.ast.2025.110014

Yunpeng Liu , Longchao Xu , Ronghui Cheng , Peng Guo , Yingwen Yan

{"title":"Experimental study on phase transfer of longitudinal mode combustion oscillations in bluff body diffusion flames","authors":"Yunpeng Liu , Longchao Xu , Ronghui Cheng , Peng Guo , Yingwen Yan","doi":"10.1016/j.ast.2025.110014","DOIUrl":null,"url":null,"abstract":"<div><div>The issue of combustion oscillations in bluff body diffusion flames within afterburners has received considerable attention. This study focuses on longitudinal mode oscillations of these flames. Through experiments, the dynamic response of the flame and self-sustained oscillations were examined. A validation from the experiment confirmed a coupling mechanism among velocity, pressure, and heat release rate oscillations. The results show that, despite the extended structure of the bluff body diffusion flame and significant phase differences in heat release rate pulsations across various flame regions, it is still reasonable to treat the flame as a point heat source. Using phase analysis, the study demonstrates how inlet conditions influence combustion oscillations. It also reveals that altering the bluff body structure can reduce the oscillation pressure amplitude by 64.5%. Therefore, modulating the dynamic response of the flame is key to mitigating combustion oscillations in afterburners, especially when the system's acoustic characteristics remain unchanged.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"159 ","pages":"Article 110014"},"PeriodicalIF":5.8000,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aerospace Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1270963825000860","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}

引用次数: 0

Abstract

The issue of combustion oscillations in bluff body diffusion flames within afterburners has received considerable attention. This study focuses on longitudinal mode oscillations of these flames. Through experiments, the dynamic response of the flame and self-sustained oscillations were examined. A validation from the experiment confirmed a coupling mechanism among velocity, pressure, and heat release rate oscillations. The results show that, despite the extended structure of the bluff body diffusion flame and significant phase differences in heat release rate pulsations across various flame regions, it is still reasonable to treat the flame as a point heat source. Using phase analysis, the study demonstrates how inlet conditions influence combustion oscillations. It also reveals that altering the bluff body structure can reduce the oscillation pressure amplitude by 64.5%. Therefore, modulating the dynamic response of the flame is key to mitigating combustion oscillations in afterburners, especially when the system's acoustic characteristics remain unchanged.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

钝体扩散火焰纵模燃烧振荡相转移的实验研究

加力燃烧室内钝体扩散火焰的燃烧振荡问题引起了人们的广泛关注。本研究的重点是这些火焰的纵模振荡。通过实验，研究了火焰的动态响应和自持续振荡。实验验证证实了速度、压力和热释放率振荡之间的耦合机制。结果表明，尽管钝体扩散火焰的结构有所扩展，且不同火焰区域的放热速率脉动存在显著的相位差异，但将火焰视为点热源仍是合理的。通过相分析，研究了进气条件对燃烧振荡的影响。改变钝体结构可使振动压力幅值减小64.5%。因此，调节火焰的动态响应是减轻加力燃烧室燃烧振荡的关键，特别是当系统的声学特性保持不变时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.