Identification, Modeling and Control of Nonlinear Thermoacoustic Instability

非线性热声不稳定性的识别、建模和控制

基本信息

项目摘要

Spontaneous pressure and heat release rate oscillations can get excited in combustion systems (employed commonly in land-based gas turbines, aero-engines and furnaces) due to coupling between the acoustic modes of the system and unsteady heat release rate from the source of combustion. These self-excited oscillations result in high noise levels, increased emission of NOx gases and reduced life span of the combustion system. In extreme cases, the emergence of such oscillations can lead to complete system failure. Hence, there is a huge impetus for investigations on thermoacoustic instability in practical combustion systems. Recent research on combustion systems has revealed that inherent dynamics of self-excited thermoacoustic oscillations, previously believed to be restricted to limit cycle behavior, can undergo bifurcations leading to highly complex nonlinear behavior, including chaotic dynamics. This fundamental discovery creates the need to redefine conventional analyses and control strategies applied in thermoacoustic systems. The focus of the proposed project is on investigating nonlinear dynamics of thermoacoustic oscillations and formulating active control strategies that take nonlinearities of self-excited oscillations into account. Three main objectives have been defined for the project: a) development of techniques for the identification of nonlinear characteristics of thermoacoustic oscillations, b) development and implementation of nonlinear, model-based control strategies, designed specifically to control bifurcations and complex (periodic, quasi-periodic and chaotic) nonlinear states, and, c) investigating the describing function approach in the light of nonlinear oscillations and formulating an extension to tackle complex behavior of self-excited thermoacoustic oscillations, in addition to limit cycle behavior. The proposed research is not only a fundamental study of one of the most interesting naturally occurring nonlinear coupling, but is also of a high and immediate significance to address one of the most crucial and long-standing issues in the power and propulsion industry.
由于燃烧系统的声学模态与来自燃烧源的不稳定放热率之间的耦合,在燃烧系统(通常用于陆基燃气轮机、航空发动机和熔炉)中可以激发自发压力和放热率振荡。这些自激振荡导致高噪声水平、增加的NOx气体排放和燃烧系统的寿命缩短。在极端情况下,这种振荡的出现可能导致整个系统故障。因此,对实际燃烧系统中热声不稳定性的研究具有巨大的推动力。最近对燃烧系统的研究表明,自激热声振荡的固有动力学,以前被认为是限制在极限环行为,可以经历分叉导致高度复杂的非线性行为,包括混沌动力学。这一基本发现需要重新定义应用于热声系统的传统分析和控制策略。该项目的重点是研究热声振荡的非线性动力学,并制定主动控制策略,考虑自激振荡的非线性。为该项目确定了三个主要目标:B)开发和实施非线性、基于模型的控制策略,专门设计用于控制分叉和复杂的(周期、准周期和混沌)非线性状态,以及,c)研究了非线性振荡的描述函数方法,并制定了一个扩展,以解决自激热声振荡的复杂行为,除了极限环行为。所提出的研究不仅是对最有趣的自然发生的非线性耦合之一的基础研究,而且对于解决电力和推进工业中最关键和最长期存在的问题之一也具有重要的现实意义。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Coherence resonance in a thermoacoustic system.
Effect of phase-shift feedback on thermoacoustic coupling
相移反馈对热声耦合的影响
  • DOI:
    10.1016/j.ifacol.2016.07.474
  • 发表时间:
    2016
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Morán;Saurabh;Paschereit;Kabiraj
  • 通讯作者:
    Kabiraj
Chaos in an imperfectly premixed model combustor.
  • DOI:
    10.1063/1.4906943
  • 发表时间:
    2015-02
  • 期刊:
  • 影响因子:
    2.9
  • 作者:
    Lipika Kabiraj;Aditya Saurabh;N. Karimi;Anna Sailor;E. Mastorakos;A. Dowling;C. Paschereit
  • 通讯作者:
    Lipika Kabiraj;Aditya Saurabh;N. Karimi;Anna Sailor;E. Mastorakos;A. Dowling;C. Paschereit
Effect of Noise on a Model Thermoacoustic System at its Stability Boundary
噪声对模型热声系统稳定边界的影响
  • DOI:
    10.1007/978-3-658-13823-3
  • 发表时间:
    2016
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Steinert
  • 通讯作者:
    Steinert
Numerical results on noise-induced dynamics in the subthreshold regime for thermoacoustic systems
  • DOI:
    10.1016/j.jsv.2016.12.004
  • 发表时间:
    2017-03
  • 期刊:
  • 影响因子:
    4.7
  • 作者:
    Vikrant Gupta;Aditya Saurabh;C. Paschereit;Lipika Kabiraj
  • 通讯作者:
    Vikrant Gupta;Aditya Saurabh;C. Paschereit;Lipika Kabiraj
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Professorin Dr. Lipika Kabiraj其他文献

Professorin Dr. Lipika Kabiraj的其他文献

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