Nonlinear unstable-combustion prediction method and device

Abstract

The invention relates to a nonlinear unstable-combustion prediction method and device. The nonlinear unstable-combustion prediction method comprises the steps of selecting a pulsating pressure time sequence with preset length in a combustion chamber; utilizing an autocorrelation function method to calculate time delay of the pulsating pressure time sequence; adopting a G-P algorithm to calculate embedded dimension of the pulsating pressure time sequence according to a Taken theorem; reconstructing a phase space according to the time delay and the embedded dimension of the pulsating pressure time sequence; performing singular value decomposition on a matrix of the reconstructed phase space and extracting a maximum Lyapunov index of the pulsating pressure time sequence; establishing a nonlinear prediction model of the pulsating pressure time sequence based on the maximum Lyapunov index and performing nonlinear prediction on development of the pulsating pressure time sequence in the combustion chamber according to the nonlinear prediction model. By means of the nonlinear unstable-combustion prediction method and device, a nonlinearity characteristic of the pulsating pressure time sequence in the combustion chamber can be effectively caught to serve as an important basis for combustion adjustment.

Description

technical field [0001] The invention relates to the technical field of combustion instability prediction, in particular to a nonlinear prediction method and device for combustion instability. Background technique [0002] Over the past ten years, with the emphasis on environmental protection around the world, countries have become more and more stringent on the emission requirements of heavy-duty gas turbine combustors, especially NOx emissions. Therefore, when designing and developing a new generation of heavy-duty gas turbines, major heavy-duty gas turbine manufacturers, such as GE, MHI, Siemens, etc., mostly adopt lean premixed combustion technology to replace the traditional diffusion combustion mode with water injection or steam injection in the combustion chamber. method. Although the combustion chamber adopting the lean premixed combustion method has the advantage of low pollution, its development is subject to many restrictions, such as flameout, backfire, and espec...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the traditional linear analysis method for combustion instability has great limitations and cannot capture the nonlinear characteristics of combustion instability

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