Determination of the growth rate of combustion instability of swirl coaxial injectors

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (18) : 332-337.

YANG Shangrong, WU Linlong, YU Han, YANG Baoe

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Abstract

In order to determine linear growth rates of combustion instability of swirl coaxial injectors, the output-only system identification method, based on the Fokker–Planck formalism in stochastic dynamics, was used to identify growth rates from dynamic pressure time series under four operating conditions. Uncertainty and sensitivity analysis were also conducted. It is shown that the growth rates are unchanged after conversion of pressure units, while conversion relationships were obtained for saturation coefficient and noise intensity. And accuracy of identification for the three parameters was invariable. Large amplitude oscillations may occur for acoustic modes with negative growth rates due to the influence of noise. The improved accuracy of identifi-cation can be realized with increasing the sampling time, and for optimal sampling rates, it depends on operat-ing conditions. It is also found that uncertainties introduced by combustion noise need to be considered when growth rates were extracted from the linear growth region of dynamic pressure time series.

Key words

Swirl coaxial injector / Combustion instability / Combustion noise / Growth rate / Output-only system identification

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YANG Shangrong, WU Linlong, YU Han, YANG Baoe. Determination of the growth rate of combustion instability of swirl coaxial injectors[J]. Journal of Vibration and Shock, 2023, 42(18): 332-337

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