Spectral analysis of high-speed flow at combustion of preliminary unprepared fuel-air mixture

M. A. Goldfeld

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The results of the study of spectral characteristics of high-speed flow under conditions of autoignition of priliminary unprepared fuel-air mixture with intensive interaction of external acoustics and combustion are presented. As a result of thermoacoustic interaction, the power of pulsations increases by an order of magnitude or more compared to the case of “cold” flow, as a result of which mixing improves, combustion intensifies and heat release increases. At high levels of heat release, flow instability and the probability of transition to vibrational combustion occur.

Keywords: supersonic flow, combustion, pressure pulsations, spectrum.

Received: 15.10.2024
Revised: 29.11.2024
Accepted: 29.11.2024

DOI: 10.61011/PJTF.2025.07.60069.20148

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