DRDL at the 2016 Canadian CI/CS Combustion meeting

Earlier in the week, some of us were in Waterloo, ON, at the Canadian Section of the Combustion Institute yearly technical meeting, where we presented progress in our reactive gasdynamics work.

Wentian, Bijan, Nick, Matei, Brian and Mohamed

Thermal ignition revisited with molecular dynamics: role of fluctuations in activated collisions N. Sirmas & M.I. Radulescu

Nick Sirmas, in true form, presented his study on the role of molecular fluctuations in self-ignition in gases.

He tackled thermal ignition problem with molecular dynamics.

He found that non-equilibrium effects during thermal runaway occurs via hot-spots.  These are spontaneously generated by molecular fluctuations, and preferred in systems with high activation energies and heat release.  Reactive collisions are preferred in the neighborhood of previous reactive collisions, as common sense dictates.  The result is that at sufficiently low temperatures, hot spots are responsible for drastic reduction in the ignition delay predicted by kinetic theory arguments?

Is this why low temperature ignition experiments depart from kinetic predictions?  We think so.

A quantitative study on the influence of cellular structure on the dynamics of detonations with constant mass divergence B. Borzou & M.I. Radulescu 

Bijan Borzou presented part of his PhD work.  


A tube with a cross-section increasing exponentially with distance (exponential horn) permits to mainatain a costant mass divergence.  Detonations can be kept at steady state at below CJ speeds.  These experiments serve to formulate and test different meso and macro scale models for detonation dynamics.

Stay tuned - his defence coming up in a week!

Gas dynamic model for CJ deflagrations in a detonation transmission problem W. Wang & M.I. Radulescu  


Wang Wentian presented our gasdynamic model for CJ deflagrations in the problem of detonation transmission past a row of cylinders. 

A methane-oxygen detonation interacts with a column of cylinders and gives rise to a shock - fast flame complex.
 Wentian formulated a self-similar gasdynamic model, whose predictions were found in excellent agreement with experiment.



A futher comparison with experiment was provided by:

Chapman-Jouguet deflagrations and their transition to detonation  M. Saif, A. Pekalski & M.I. Radulescu   


Mohamed Saif presented his MaSc thesis work.

Influence of turbulent fluctuations on the structure of irregular detonation propagation  B. Maxwell, R. Bhattacharjee, S. Lau-Chapdelaine, S. Falle, G. Sharpe & M. Radulescu

Brian Maxwell presented part of his PhD work.

more...





Road trip!

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