Ignition delay times of methane fuels at thrust chamber conditions in an ultra-high-pressure shock tube

Pierro, Michael; Laich, Andrew; Urso, Justin J.; Kinney, Cory; Vasu, Subith; Albright, Marley A.

doi:10.2514/6.2022-1254

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Thus, this model is commonly used in many skeletal model reduction studies for methane combustion at atmospheric pressure [18,41,42], although the fidelity of the model is questionable at high pressures [43][44][45]. For high pressures conditions, shock tube experiments or rapid compression machine (RCM) experiments are needed to get insight into methane combustion properties [46][47][48]. Foundational fuel chemistry model (FFCM-1) [49], AramcoMech 3.0 model [50], and a model from Hashemi et al (H68) [44] are developed based on such experiments.…”

Section: Introductionmentioning

confidence: 99%

Skeletal Reaction Model Generation for Atmospheric and High Pressure Combustion of Methane

Liu¹,

Babaee²,

Givi³

et al. 2022

Preprint

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Skeletal reaction models for atmospheric and high pressure combustion of methane are generated from detailed kinetics models through the forced-optimally time dependent (f-OTD) methodology. In the f-OTD method, local sensitivities are decomposed to the multiplication of two low-rank time-dependent matrices.The evolution equation of these matrices are derived from the governing equations of the system. Modeled sensitivities are then analyzed temporally to rank the species based on their importance and produce different skeletal models with different number of species. Skeletal reduction with the f-OTD method is conducted of two detailed kinetics models for methane combustion: the GRI-Mech 3.0 for atmospheric pressure and the FFCM-1 for high pressures. A series of skeletal models with different levels of accuracy are derived in each case. The performances of the generated models are compared against two detailed models (GRI-Mech 3.0 and FFCM-1) based on their ability in predicting ignition delays, laminar flame speeds, and flame extinctions. The effect of pressure on the significance of specific reactions are also analyzed for high pressure combustion.

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Section: Introductionmentioning

confidence: 99%

Skeletal Reaction Model Generation for Atmospheric and High Pressure Combustion of Methane

Liu¹,

Babaee²,

Givi³

et al. 2022

Preprint

View full text Add to dashboard Cite

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Family of Skeletal Reaction Mechanisms for Methane–Oxygen Combustion in Rocket Propulsion

Liberatori,

Malpica Galassi,

Bianchi

et al. 2024

Journal of Propulsion and Power

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Analyzing methane–oxygen rocket propellant combinations requires suitable modeling of the major chemical reaction processes. Although several detailed kinetic mechanisms for methane oxidation in air exist, most do not reproduce the reaction pathways of high-pressure methane–oxygen combustion, typical of liquid rocket engines. Moreover, when large-scale computational fluid dynamics simulations are pursued, detailed reaction schemes are not computationally viable. In the present study, we identify a reliable detailed kinetic scheme for liquid rocket applications, and then we perform a wide reduction campaign leveraging computational singular perturbation theory. Enforcing various reduction targets, we obtain a family of seven skeletal schemes, including 11–39 species. Each mechanism targets different combustion modes, namely, homogeneous ignition, complex flows and flame extinction, premixed burning, reaction processes under intense turbulent mixing, and largely off-stoichiometric mixtures, typical of rocket engine preburners. We test the skeletal mechanisms against meaningful validation targets, attaining appreciable predictive accuracy compared with the detailed parent scheme. We expect the proposed family of skeletal schemes to offer a wide and flexible range of solutions—in terms of size, accuracy, and dominant combustion mode—for performing large-scale yet cost-affordable computational fluid dynamics of methane–oxygen flames under rocket-engine-relevant conditions.

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Ignition delay times of methane fuels at thrust chamber conditions in an ultra-high-pressure shock tube

Cited by 2 publications

References 18 publications

Skeletal Reaction Model Generation for Atmospheric and High Pressure Combustion of Methane

Skeletal Reaction Model Generation for Atmospheric and High Pressure Combustion of Methane

Family of Skeletal Reaction Mechanisms for Methane–Oxygen Combustion in Rocket Propulsion

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