Experimental study on thermoacoustic performance of radial staged combustor

doi:10.3785/j.issn.1008-973X.2023.06.019

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (6): 1234-1241 DOI: 10.3785/j.issn.1008-973X.2023.06.019

Experimental study on thermoacoustic performance of radial staged combustor

Yan-ni FU1,2(

),Yong-feng SUI2,Yu-ming ZHANG2,Yao ZHENG1,Yi-fan XIA1,*(

)

1. School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China
2. Hangzhou Steam Turbine Limited Company, Hangzhou 310022, China

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Abstract

In order to investigate the effect of fuel distribution ratio of a radial staged combustor on the thermoacoustic characteristics, experimental tests were carried out on a 4 MW industrial can combustor, which had the radial staged combustor. In the tests, by changing the fuel distribution ratio of the pilot burner and the main burner, the influence of fuel distribution ratio on the frequency and amplitude of the dynamic pressure was analyzed. The phase space reconstruction method and the recursive analysis were used to investigate the thermoacoustic variation characteristics of the combustor during the process of changing the distribution ratios. Results showed that there were two dominant frequencies of a low frequency (70?90 Hz) and a high frequency (200?230 Hz) in the combustor. During the process of changing the fuel distribution ratio, the dominant frequency jumped from the low frequency to the high frequency. The reconstructed phase plots and the recurrence plots showed that as the fuel distribution ratio increased, the thermoacoustic state in the combustion chamber had a switching process. The thermoacoustic state transitioned from quasi periodic state to chaotic state, and finally switched to limit cycle state.

Key words： radial staged combustor thermoacoustic oscillation phase space analysis recursive analysis

Received: 06 June 2022 Published: 30 June 2023

CLC:

TK 47

Fund: 浙江省重点研发计划资助项目（2020C01088）

Corresponding Authors: Yi-fan XIA E-mail: fuyn@zju.edu.cn;xiayifan@zju.edu.cn

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Cite this article:

Yan-ni FU,Yong-feng SUI,Yu-ming ZHANG,Yao ZHENG,Yi-fan XIA. Experimental study on thermoacoustic performance of radial staged combustor. Journal of ZheJiang University (Engineering Science), 2023, 57(6): 1234-1241.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.06.019 OR https://www.zjujournals.com/eng/Y2023/V57/I6/1234

径向分级燃烧室热声特性的试验研究

为了探究径向分级燃烧室燃料分配比例对燃烧室热声特性的影响，对工业级单筒4 MW功率等级径向分级燃烧室进行试验研究. 试验中通过改变径向上值班喷嘴和主燃喷嘴的燃料分配比例，分析燃料分配比例对动态压力特征频率和幅值的影响. 采用相空间重构方法和递归分析方法，探究燃料分配比例变化过程中燃烧室内热声状态的变化特征. 结果表明，燃烧室内整体存在低频（70~90 Hz）和高频（200~230 Hz）2个主导频率. 在燃料分配比例调节过程中，出现低频向高频跃迁现象. 相空间重构图和递归图显示，当燃料分配比例增大时，燃烧室内热声状态存在切换过程：由准周期状态过渡为混沌状态，最终切换至极限环状态.

关键词： 径向分级燃烧室, 热声振荡, 相空间分析, 递归分析

Fig.1 Configuration of testing section of radial staged combustor

Fig.2 Site picture of combustor test rig

Tab.1 Test conditions of changing fuel distribution ratio under different powers

Fig.3 Average mutual information of dynamic pressure signal with different delay time in case 3

Fig.4 Distance quantities of dynamic pressure signal with different embedding dimensions in case 3

Fig.5 Variation of dynamic pressure main frequency under different fuel distribution ratios in test cases

Fig.6 Variation of dynamic pressure amplitude under different fuel distribution ratios in test cases

Tab.2 Variation of fuel distribution ratio (case 3)

Fig.7 Reconstructed phase plots of dynamic pressure under different fuel distribution ratios in case 3

Fig.8 Recurrence plots of dynamic pressure under different fuel distribution ratios in case 3


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