Influence of Natural Gas Addition on Combustion Instabilities on a Lean-Premixed Hydrogen Flame

Shahin, Tristan T.; Gejji, Rohan; Hodge, Alexander J.; McLean, Thomas N.; Lucht, Robert P.; Slabaugh, Carson D.

doi:10.2514/6.2024-0392

Influence of Natural Gas Addition on Combustion Instabilities on a Lean-Premixed Hydrogen Flame

Conference · Thu Jan 04 04:00:00 EST 2024 · AIAA SCITECH 2024 Forum

DOI:https://doi.org/10.2514/6.2024-0392· OSTI ID:2375522

Shahin, Tristan T. ^[1]; Gejji, Rohan ^[2]; Hodge, Alexander J. ^[2]; McLean, Thomas N. ^[2]; Lucht, Robert P. ^[2]; Slabaugh, Carson D. ^[2]

Purdue University System; Purdue University
Purdue University System

The influence of fuel composition on combustion instabilities in a high-pressure combustor operated with hydrogen and natural gas fuels is characterized. A micromix multi-stage injector with 19 elements is used to introduce hydrogen and natural gas premixed with heated air into an optically accessible combustor. As the equivalence ratio and flame temperature is varied along with change in hydrogen fraction in the fuel, self-excited longitudinal instabilities are observed in the combustor. The instability amplitude reduces considerably as hydrogen fraction is increased. This sensitivity differs at higher flame temperature, with large amplitude instabilities attenuating at lower hydrogen fractions for flames with more thermal power. Increasing hydrogen concentration is shown, through kinetic modeling, to decrease the bulk reaction timescale linearly with observed instability amplitude. Spatial distribution of heat release in the combustor evaluated from OH* chemiluminescence imaging reveals excitation of primarily the 2L mode in the combustion chamber at ~1100 Hz, at all equivalence ratios and fuel compositions. Increasing equivalence ratio and hydrogen addition decreases the length of the positively correlated region, which leads to instability dampening.

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Research Organization:: Purdue University

Sponsoring Organization:: USDOE

DOE Contract Number:: FE0032074

OSTI ID:: 2375522

Report Number(s):: DOE-PURDUE-0032074-1

Conference Information:: Journal Name: AIAA SCITECH 2024 Forum

Country of Publication:: United States

Language:: English

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