Fuel and Combustion

Fuel and Combustion

Numerical investigation of combustion noise in gas turbine combustor using hydrogen/ ethylene: machine learning optimization

Document Type : Original Article

Authors
Najmeh Hajialigol
Mostafa Jamali
Hamedan University of Technology
10.22034/jfnc.2024.451117.1381
Abstract
The field has long acknowledged the detrimental effects of entropy waves, including heightened NOx emissions, combustion chamber instability, and noise production. Entropy oscillations, when accelerated, serve as a source of indirect noise, exacerbating the combustion chamber's instability. A computational study delved into the entropy noise within a lean-premixed H2/ ethylene burner to better comprehend these phenomena. Utilizing flamelet and large Eddy Simulation, the study shed light on the behavior of entropy waves and their impact on combustion dynamics. It particularly examined how various thermal and fluid conditions affect entropy noise in both thermally convective and adiabatic combustion chambers, focusing on temperature. In-depth analysis was conducted on elements like the strength of inlet turbulence, stoichiometric ratio, and the preheating level of the unburned mixture. The findings revealed intriguing connections between these factors and the acoustic system response. Notably, an increase in equivalence ratio, and temperature led to a heightened auditory response, suggesting that such conditions foster the generation and spread of entropy noise. Conversely, the study found that high turbulence intensity at the amplifier negatively impacted the transmission of entropy oscillations, thereby reducing the auditory response. This suggests that intense turbulence can interfere with entropy wave propagation, lessening their potential to produce significant acoustic effects.
Keywords
Hydrogen
Combustion noise
Entropy wave
Premixed combustion
combustion chamber

Subjects

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