Combustion instability active inhibition method based on autoregressive moving average model

Abstract

The invention provides a combustion instability self-adaptive closed-loop active control method, and belongs to the field of combustion. The method comprises the following steps that firstly, online identification is carried out on a system through a fuel oil flow supply flow signal and a dynamic pressure signal by using recursive least square algorithm; and indirect self-correction active controlis carried out by using minimum variance, the fuel oil flow at each moment is decided, so that the combustion pulsation pressure is controlled. The invention relates to the self-adaptive closed-loopactive control method, the method comprises the following steps that a current control signal and a combustion pressure pulsation feedback signal after control are comprehensively considered in a control process, structural parameters of the system are continuously updated, and variance of combustion pressure pulsation is taken as a target function, and a control signal, namely fuel flow, of the system is given under the condition of ensuring that the variance of the pressure pulsation is minimum.

Description

technical field [0001] The invention belongs to the field of combustion, and relates to a method for actively suppressing combustion instability based on an autoregressive moving average model (CARMA) with a control quantity. Background technique [0002] Unstable combustion in the combustion system is manifested as a large pressure pulsation during combustion, which not only has an adverse effect on the hardware structure of the combustion system, but also greatly increases the capital investment and development cycle of the equipment. [0003] In recent years, the international attention to environmental pollution has increased, and the development of low-pollution combustion technology is imminent. A low-pollution combustion technology that is prevalent at present—lean oil premixed combustion technology, has shown good characteristics of low pollution emissions. However, due to the use of lean fuel combustion technology, the combustion is more sensitive to the pulsation ...

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Problems solved by technology

When the pressure and equivalence ratio pulsation meet certain conditions, the strong coupling process will lead to serious oscillating combustion in the combustion system

[0006] At present, there have been certain research results on the suppression of unstable combustion abroad, and passive and active suppression methods for unstable combustion have been developed. The typical passive control method is to use structures such as Helmholtz resonators and quarter-wavelength tubes. To suppress unstable pressure pulsation, but in the process of its engineering, it faces the disadvantages of fixed pressure pulsation frequency and small controllable range.

An active control method is to apply a disturbance pressure signal to the combustion system during the combustion process. This control method does not consider the actual feedback of the pressure pulsation after the combustion system is controlled. It is an open-loop control

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