Ignition delays in MMH + CH2 + O2 + Ar mixtures

L. Catoire; G. Dupré; C. Paillard; A. Elaissi

doi:10.2514/2.5847

Ignition delays in MMH + CH₂ + O₂ + Ar mixtures

L. Catoire
, G. Dupré
, C. Paillard
, A. Elaissi

conventionnée avec l'Université d'Orléans

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

Ignition delays have been investigated for mixtures of monomethylhydrazine (MMH) + O₂ + CH₄ + Ar at high temperature (907-1360 K) in the pressure range 246-412 kPa. All measurements were performed in the reflected-shock region of a shock tube. Reaction progress was monitored via piezoelectric pressure transducers and UV absorption by MMH. In the composition range studied, the ignition delays τ can be correlated by the expression τ(μs) = 2.042 × 10^-2[MMH]^-0.87[O₂]^-2.09 [CH₄]^+0.68[Ar]^1.24 exp(8503/T) where the concentrations are expressed in moles m^-3. This study shows unambiguously that CH₄ inhibits MMH + O₂ (+Ar) ignition. This inhibiting effect depends on the mixture composition (equivalence ratio in MMH, [MMH]/[CH₄] ratio, etc.), on the temperature, and on the pressure. From a mechanistic point of view, methane is supposed to compete with MMH decomposition products for reaction with oxygen. The comparison between the CH₄/O₂/Ar and CH₄/MMH/O₂/Ar ignition delays leads to the conclusion that MMH can be used as a ignition promoter in CH₄/O₂ mixtures.

langue originale	Anglais
Pages (de - à)	1085-1089
Nombre de pages	5
journal	Journal of Propulsion and Power
Volume	17
Numéro de publication	5
Les DOIs	https://doi.org/10.2514/2.5847
état	Publié - 1 janv. 2001
Modification externe	Oui

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10.2514/2.5847

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title = "Ignition delays in MMH + CH2 + O2 + Ar mixtures",

abstract = "Ignition delays have been investigated for mixtures of monomethylhydrazine (MMH) + O2 + CH4 + Ar at high temperature (907-1360 K) in the pressure range 246-412 kPa. All measurements were performed in the reflected-shock region of a shock tube. Reaction progress was monitored via piezoelectric pressure transducers and UV absorption by MMH. In the composition range studied, the ignition delays τ can be correlated by the expression τ(μs) = 2.042 × 10-2[MMH]-0.87[O2]-2.09 [CH4]+0.68[Ar]1.24 exp(8503/T) where the concentrations are expressed in moles m-3. This study shows unambiguously that CH4 inhibits MMH + O2 (+Ar) ignition. This inhibiting effect depends on the mixture composition (equivalence ratio in MMH, [MMH]/[CH4] ratio, etc.), on the temperature, and on the pressure. From a mechanistic point of view, methane is supposed to compete with MMH decomposition products for reaction with oxygen. The comparison between the CH4/O2/Ar and CH4/MMH/O2/Ar ignition delays leads to the conclusion that MMH can be used as a ignition promoter in CH4/O2 mixtures.",

author = "L. Catoire and G. Dupr{\'e} and C. Paillard and A. Elaissi",

year = "2001",

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doi = "10.2514/2.5847",

language = "English",

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journal = "Journal of Propulsion and Power",

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T1 - Ignition delays in MMH + CH2 + O2 + Ar mixtures

AU - Catoire, L.

AU - Dupré, G.

AU - Paillard, C.

AU - Elaissi, A.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Ignition delays have been investigated for mixtures of monomethylhydrazine (MMH) + O2 + CH4 + Ar at high temperature (907-1360 K) in the pressure range 246-412 kPa. All measurements were performed in the reflected-shock region of a shock tube. Reaction progress was monitored via piezoelectric pressure transducers and UV absorption by MMH. In the composition range studied, the ignition delays τ can be correlated by the expression τ(μs) = 2.042 × 10-2[MMH]-0.87[O2]-2.09 [CH4]+0.68[Ar]1.24 exp(8503/T) where the concentrations are expressed in moles m-3. This study shows unambiguously that CH4 inhibits MMH + O2 (+Ar) ignition. This inhibiting effect depends on the mixture composition (equivalence ratio in MMH, [MMH]/[CH4] ratio, etc.), on the temperature, and on the pressure. From a mechanistic point of view, methane is supposed to compete with MMH decomposition products for reaction with oxygen. The comparison between the CH4/O2/Ar and CH4/MMH/O2/Ar ignition delays leads to the conclusion that MMH can be used as a ignition promoter in CH4/O2 mixtures.

AB - Ignition delays have been investigated for mixtures of monomethylhydrazine (MMH) + O2 + CH4 + Ar at high temperature (907-1360 K) in the pressure range 246-412 kPa. All measurements were performed in the reflected-shock region of a shock tube. Reaction progress was monitored via piezoelectric pressure transducers and UV absorption by MMH. In the composition range studied, the ignition delays τ can be correlated by the expression τ(μs) = 2.042 × 10-2[MMH]-0.87[O2]-2.09 [CH4]+0.68[Ar]1.24 exp(8503/T) where the concentrations are expressed in moles m-3. This study shows unambiguously that CH4 inhibits MMH + O2 (+Ar) ignition. This inhibiting effect depends on the mixture composition (equivalence ratio in MMH, [MMH]/[CH4] ratio, etc.), on the temperature, and on the pressure. From a mechanistic point of view, methane is supposed to compete with MMH decomposition products for reaction with oxygen. The comparison between the CH4/O2/Ar and CH4/MMH/O2/Ar ignition delays leads to the conclusion that MMH can be used as a ignition promoter in CH4/O2 mixtures.

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DO - 10.2514/2.5847

M3 - Article

AN - SCOPUS:0035443985

SN - 0748-4658

VL - 17

SP - 1085

EP - 1089

JO - Journal of Propulsion and Power

JF - Journal of Propulsion and Power

IS - 5

ER -

Ignition delays in MMH + CH2 + O2 + Ar mixtures

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Ignition delays in MMH + CH₂ + O₂ + Ar mixtures