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

In English

Författare

Summary, in English

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.

Publiceringsår

2014

Språk

Engelska

Sidor

4130-4138

Publikation/Tidskrift/Serie

Energy & Fuels

Volym

28

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

The American Chemical Society (ACS)

Ämne

  • Atom and Molecular Physics and Optics
  • Energy Engineering

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0887-0624