Rewrite the given abstract
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Abstract: The Bychkov model of extremely fast flame acceleration in obstructed
pipes [Combust. Flame 157 (2010) 2012] employs a number of simplifying
assumptions, including those of slip and adiabatic surfaces of the obstacles and of
the pipe wall. In the present work, the influence of various mechanistic surface
conditions on the flame dynamics in a cylindrical pipe of radius R, involving an
array of parallel, tightly-spaced obstacles of length aR, is scrutinized by means of
the computational simulations of the fully-compressible axisymmetric
hydrodynamic and combustion equations with an Arrhenius chemistry.
Specifically, nonslip and slip surfaces are compared for the blockage ratio, a and
the spacing between the obstacles, ?z, in the ranges 1/3 = a = 2/3 and 0.25 = ?z/R
= 2.0, respectively. It is shown that the impact of surface friction on flame
acceleration is minor, only 1.3~3.5%, being positive in a pipe with ?z/R = 0.5 and
negative for ?z/R = 0.25. We have also demonstrated a minor effect of the
isothermal surfaces as compared to the adiabatic ones [Phys. Fluids 28 (2016)
093602]. With the fact that the real boundary conditions are neither slip nor
nonslip; neither adiabatic nor isothermal, but in between these categories, the
present work thereby justifies the Bychkov model and makes its wider applicable
to the practical reality. While this result can be anticipated and explained by the
fact that the flame dynamics is mainly driven by its spreading in the unobstructed
portion of an obstructed pipe (i.e. far from the wall), the situation is, however,
qualitatively different from that in the unobstructed pipes, where the mechanistic
and thermal wall conditions modify the flame dynamics conceptually.
Keywords: computational simulations, obstructed pipes; wall friction; boundary