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Related Experiment Videos

Temperature fields during the development of autoignition in a rapid compression machine.

J F Griffiths1, J P MacNamara, C Mohamed

  • 1School of Chemistry, The University, Leeds, UK LS2 9JT. johng@chem.leeds.ac.uk

Faraday Discussions
|March 7, 2002
PubMed
Summary

Investigating combustion in a rapid compression machine (RCM), this study reveals how different chemical reactions, like di-tert-butyl peroxide and n-pentane combustion, spatially influence temperature fields and spontaneous ignition development.

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Area of Science:

  • * Combustion Science
  • * Chemical Kinetics
  • * Fluid Dynamics

Background:

  • * Rapid Compression Machines (RCMs) are crucial for studying combustion under engine-relevant conditions.
  • * Understanding temperature and concentration fields is key to predicting ignition behavior.
  • * Acetone and formaldehyde serve as valuable tracers for visualizing combustion processes.

Purpose of the Study:

  • * To investigate temperature and concentration fields in an RCM.
  • * To compare combustion behavior of di-tert-butyl peroxide and n-pentane.
  • * To analyze the impact of chemistry on spatial ignition development.

Main Methods:

  • * Schlieren photography for visualizing density gradients.
  • * Chemiluminescent imaging for detecting excited species.

Related Experiment Videos

  • * Planar Laser-Induced Fluorescence (PLIF) of acetone and formaldehyde.
  • * Experiments conducted in non-reactive and reactive conditions within the RCM.

    • Main Results:

    • * Adiabatic compression creates a hot toroidal region and a cooler core, with slower diffusion over 10 ms.
    • * Di-tert-butyl peroxide combustion shows faster reaction rates in the hotter outer region, leading to earlier completion.
    • * N-pentane combustion exhibits varied spatial ignition patterns depending on initial temperature, with cooler cores sometimes reacting faster.
    • * Differences in reaction rates and intermediate concentrations create stratification, influencing ignition evolution.

    Conclusions:

    • * The spatial development of spontaneous ignition is significantly influenced by the interplay between fluid dynamics and chemical kinetics.
    • * Different fuels and initial conditions lead to distinct temperature and concentration field evolutions.
    • * Stratification of intermediates plays a critical role in the ultimate spatial progression of ignition.