Experimental study on the transition to turbulence in secondary acoustic instability in a quarter wavelength resonator
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This study explores the intricate dynamics of secondary acoustic instability within a quarter-wavelength resonator, with a specific focus on the interplay between pressure coupling constant (βM) and flame behavior. Experimental results reveal a strong correlation between key parameters, 𝜔𝜔𝑎𝑎(growth rate) and 𝜔𝜔𝑑𝑑(decay rate), with βM, shedding light on the mechanisms governing sec-ondary acoustic instability. The flame thickness reduction, observed as βM increases, amplifies the flame front's susceptibility to pres-sure and temperature perturbations. This heightened sensitivity triggers rapid secondary acoustic instability, characterized by increased 𝜔𝜔𝑎𝑎 in the amplification zone. Simultaneously, the absolute value of 𝜔𝜔𝑑𝑑 in the damping zone decreases, emphasizing the pivotal role of βM in shaping these dynamic behaviors. The observed trends underscore βM's significant influence on the growth and decay rates, contributing to a comprehensive understanding of the complex thermos-acoustic phenomena.
Abstract
This study explores the intricate dynamics of secondary acoustic instability within a quarter-wavelength resonator, with a specific focus on the interplay between pressure coupling constant (βM) and flame behavior. Experimental results reveal a strong correlation between key parameters, 𝜔𝜔𝑎𝑎(growth rate) and 𝜔𝜔𝑑𝑑(decay rate), with βM, shedding light on the mechanisms governing sec-ondary acoustic instability. The flame thickness reduction, observed as βM increases, amplifies the flame front's susceptibility to pres-sure and temperature perturbations. This heightened sensitivity triggers rapid secondary acoustic instability, characterized by increased 𝜔𝜔𝑎𝑎 in the amplification zone. Simultaneously, the absolute value of 𝜔𝜔𝑑𝑑 in the damping zone decreases, emphasizing the pivotal role of βM in shaping these dynamic behaviors. The observed trends underscore βM's significant influence on the growth and decay rates, contributing to a comprehensive understanding of the complex thermos-acoustic phenomena.
참고문헌 (13)
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