Effect of correlation time of combustion noise on early warning indicators of thermoacoustic instability

Vishnoi, Neha1; Gupta, Vikrant2; Saurabh, Aditya3; Kabiraj, Lipika1

2024-03-01

10.1063/5.0174468

CHAOS   影响因子和分区

1054-1500

1089-7682

In this paper, we analyze the effects of finite correlation time (noise color) of combustion noise on noise-induced coherence and early warning indicators (EWIs) via numerical and experimental studies. We consider the Rijke tube as a prototypical combustion system and model combustion noise as an additive Ornstein-Uhlenbeck process while varying noise intensity and correlation time. We numerically investigate corresponding effects on coherence resonance and multi-fractal properties of pressure fluctuations. Subsequently, we experimentally validate results and elucidate the influence of noise color and intensity on trends in coherence resonance and multi-fractal measures that can be expected in a practical scenario using an electroacoustic simulator. We find that the coherence factor, which quantifies the relative contribution of coherent oscillations in a noisy signal, increases as the system approaches the thermoacoustic instability-irrespective of the correlation time. It works at most levels of combustion noise (except for too low and too high noise levels). The Hurst exponent reduces as the system approaches thermoacoustic instability only when the correlation time is small. These results have implications on the prediction and monitoring of thermoacoustic instability in practical combustors.

SCI

英语

其他

MHRD and institute seeding fund-IIT Ropar[9-277/2017/IITRPR/4854] ; MHRD["12002147","12050410247"]

Mathematics ; Physics

Mathematics, Applied ; Physics, Mathematical

WOS:001196526900002

AIP Publishing

PHYSICS

Web of Science

1.Indian Inst Technol Ropar, Dept Mech Engn, Ropar 140001, Punjab, India
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
3.Indian Inst Technol Kanpur, Dept Mech Engn, Kanpur 208016, Uttar Pradesh, India

Vishnoi, Neha,Gupta, Vikrant,Saurabh, Aditya,et al. Effect of correlation time of combustion noise on early warning indicators of thermoacoustic instability[J]. CHAOS,2024,34(3).

Vishnoi, Neha,Gupta, Vikrant,Saurabh, Aditya,&Kabiraj, Lipika.(2024).Effect of correlation time of combustion noise on early warning indicators of thermoacoustic instability.CHAOS,34(3).

Vishnoi, Neha,et al."Effect of correlation time of combustion noise on early warning indicators of thermoacoustic instability".CHAOS 34.3(2024).