Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor

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Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor. / Schönborn, Alessandro; Sayad, Parisa; Konnov, Alexander; Klingmann, Jens.

In: Energy & Fuels, Vol. 28, No. 6, 2014, p. 4130-4138.

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Schönborn, Alessandro ; Sayad, Parisa ; Konnov, Alexander ; Klingmann, Jens. / Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor. In: Energy & Fuels. 2014 ; Vol. 28, No. 6. pp. 4130-4138.

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TY - JOUR

T1 - Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor

AU - Schönborn, Alessandro

AU - Sayad, Parisa

AU - Konnov, Alexander

AU - Klingmann, Jens

PY - 2014

Y1 - 2014

N2 - Autoignition of dimethyl ether in air was studied in a turbulent flow-reactor with optical access, at conditions relevant to micro gas turbine combustors. The ignition process was visualized using OH*-chemiluminescence imaging, showing the formation of multiple autoignition kernels along the central axis of the reactor. Ignition delays in the range of tau = 112-310 ms were measured at temperatures of T = 739-902 K, pressures of P = 0.2-0.4 MPa, equivalence ratios of phi = 0.225-0.675, and initial flow velocities of U-i = 8-46 m/s. The effect of adding nitrogen to the reactants as a diluent was investigated for mole fractions of additional nitrogen ranging from 0 < X-N2 < 0.1. The experimental ignition delays were compared with homogeneous gas-phase chemical kinetic modeling. Comparison between the modeling and experiments showed significant discrepancies, but agreement was improved when heat transfer in the reactor was taken into account in the modeling.

AB - Autoignition of dimethyl ether in air was studied in a turbulent flow-reactor with optical access, at conditions relevant to micro gas turbine combustors. The ignition process was visualized using OH*-chemiluminescence imaging, showing the formation of multiple autoignition kernels along the central axis of the reactor. Ignition delays in the range of tau = 112-310 ms were measured at temperatures of T = 739-902 K, pressures of P = 0.2-0.4 MPa, equivalence ratios of phi = 0.225-0.675, and initial flow velocities of U-i = 8-46 m/s. The effect of adding nitrogen to the reactants as a diluent was investigated for mole fractions of additional nitrogen ranging from 0 < X-N2 < 0.1. The experimental ignition delays were compared with homogeneous gas-phase chemical kinetic modeling. Comparison between the modeling and experiments showed significant discrepancies, but agreement was improved when heat transfer in the reactor was taken into account in the modeling.

U2 - 10.1021/ef402476r

DO - 10.1021/ef402476r

M3 - Article

VL - 28

SP - 4130

EP - 4138

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 6

ER -