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

IF 5 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

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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.

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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.