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Experimental investigation of the effects of turbulence and mixing on autoignition chemistry

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1090
12 pages

Christos N. Markides
Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom

Epaminondas Mastorakos
Hopkinson Laboratory, Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK

要約

Autoignition of acetylene injected into a turbulent coflow of hot air has been the object of a recent experimental study to supplement previous work on autoignition locations for hydrogen. New information on the effects of turbulence intensity, turbulent lengthscale and injector diameter is made available. These pa-rameters have not been investigated before for inhomogeneous autoignition. The present study establishes that increasing the bulk velocity, while keeping the lengthscale constant, increases autoignition length. For the same turbulence intensity, the autoignition length increases as the injector diameter increases and as the tur-bulent lengthscale increases. A simultaneous decrease in turbulence intensity and increase in lengthscale causes a reduction in autoignition length. The observed trends are consistent with expectations concerning the dependence of the mixture fraction and scalar dissipation on the geometrical and flow parameters. The data can be used for the validation of models for turbulent combustion.

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