发电技术 ›› 2022, Vol. 43 ›› Issue (6): 927-934.DOI: 10.12096/j.2096-4528.pgt.21093

• 发电及环境保护 • 上一篇    下一篇

模型旋流燃烧室气体燃料火焰不稳定特性分析

郝建刚1, 贡文明2, 丁阳1, 郑丹伟3, 刘勇3   

  1. 1.华电电力科学研究院有限公司,浙江省 杭州市 310030
    2.江苏华电戚墅堰发电 有限公司,江苏省 常州市 213011
    3.航空发动机热环境与热结构工业和信息化部 重点实验室(南京航空航天大学能源与动力学院),江苏省 南京市 210016
  • 收稿日期:2022-01-29 出版日期:2022-12-31 发布日期:2023-01-03
  • 作者简介:郝建刚(1983),男,硕士,高级工程师,主要研究方向为火电厂经济运行,jiangang-hao@chder.com
    刘勇(1971),男,博士,副教授,主要研究方向为燃烧理论和燃烧数值模拟,本文通信作者,LYYL71@ nuaa.edu.cn
  • 基金资助:
    国家自然科学基金项目(91741118)

Analysis on Combustion Instability Characteristics of Model Swirl Combustor With Gas Fuel

Jiangang HAO1, Wenming GONG2, Yang DING1, Danwei ZHENG3, Yong LIU3   

  1. 1.Huadian Electric Power Research Institute Co. , Ltd. , Hangzhou 310030, Zhejiang Province, China
    2.Jiangsu Huadian Qishuyan Power Generation Co. , Ltd. , Changzhou 213011, Jiangsu Province, China
    3.Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics), Nanjing 210016, Jiangsu Province, China
  • Received:2022-01-29 Published:2022-12-31 Online:2023-01-03
  • Supported by:
    National Natural Science Foundation of China(91741118)

摘要:

燃机在贫燃工况下易出现燃烧不稳定,分析和预测不稳定燃烧特性对保证燃烧室正常工作具有重要意义。通过数值仿真得到燃烧室的火焰描述函数(flame describing function,FDF),并结合低阶热声网络模型预测了燃烧室的热声不稳定特性。首先,通过模型旋流燃烧室自激振荡实验,得到振荡燃烧发生时的工况和主频;其次,利用大涡模拟(large eddy simulation,LES),得到火焰燃烧热释放率对不同入口扰动的响应特征,通过拟合得到FDF;最后,建立了燃烧室低阶热声网络模型,并分析了燃烧室不稳定特性。结果表明:模型预测的振荡特性与实验数据相符,说明该模型能够从机理上预测燃烧不稳定特性。

关键词: 燃机燃烧室, 不稳定燃烧, 热声网络模型, 大涡模拟(LES), 火焰描述函数(FDF)

Abstract:

Combustion instability is easy to occur under lean combustion of gas turbine. Analyzing and predicting the characteristics of unstable combustion is of great significance to ensure the normal operation of combustion chamber. The flame describing function (FDF) of combustion chamber was obtained by numerical simulation, and the thermoacoustic instability characteristics of combustion chamber were predicted by combining the low-order thermoacoustic network model. Firstly, the operating conditions and main frequency of oscillating combustion were obtained through the self-excited oscillation experiment of model swirler combustor.Secondly, by using large eddy simulation (LES), the response characteristics of heat release rate of flame combustion under different inlet disturbances were obtained, and the FDF was fitted. Finally, the low-order thermoacoustic network model of the combustion chamber was established, and the instability characteristics of the combustion chamber were analyzed. The results show that the oscillation characteristics predicted by the model are consistent with the experimental data, indicating that the model can predict the combustion instability characteristics from the mechanism.

Key words: gas turbine combustor, combustion instability, thermoacoustic network model, large eddy simulation (LES), flame describing function (FDF)

中图分类号: