TY - JOUR

T1 - Experimental and numerical study of polyoxymethylene (Aldrich) combustion in counterflow

AU - Glaznev, Roman K.

AU - Karpov, Alexander I.

AU - Korobeinichev, Oleg P.

AU - Bolkisev, Andrei A.

AU - Shaklein, Artem A.

AU - Shmakov, Andrey G.

AU - Paletsky, Alexander A.

AU - Gonchikzhapov, Munko B.

AU - Kumar, Amit

PY - 2019/7/1

Y1 - 2019/7/1

N2 - The burning behavior of polyoxymethylene in the counterflow of oxidizing air has been studied experimentally and numerically. Measurements have been performed using a specially designed burner. The temperature profiles were measured in gas phases by a microthermocouple technique. The burning surface temperature and the mass burning rates of solid fuel were determined. The chemical structure of counterflow flame was investigated using the mass spectrometric sampling by microprobe. The composition of the gas sample was analyzed on-line with a mass spectrometric complex (Hiden HPR 60), based on a quadrupole mass spectrometer. The species CH 2 O, CO, CO 2 , H 2 O, O 2 , N 2 were identified and their concentration profiles were measured. The composition of products and kinetic parameters of POM thermal degradation have been determined by mass spectrometry and thermogravimetric analysis. Quasi one-dimensionality of considered diffusion flame has been established experimentally, which allows analysis of flame parameters in relation to the only coordinate normal to the solid fuel's burning surface and substantially simplifies the theoretical description. Predictions have been performed by a coupled model describing feedback heat and mass transfer between gas-phase flame and polymeric solid fuel. A two-dimensional elliptic equation in axisymmetric formulation has been employed to simulate heat transfer in solid fuel, and a set of one-dimensional hyperbolic equations has been used to determine the solid-to-gas conversion degree of the pyrolysis reaction. Gas-phase formulation is presented by one-dimensional conservation equations for multi-component flow with a detailed kinetic mechanism of combustion. Numerical results showed good agreement with the measurements for temperature and species concentration profiles, as well as for the mass burning rate and the surface temperature of solid fuel.

AB - The burning behavior of polyoxymethylene in the counterflow of oxidizing air has been studied experimentally and numerically. Measurements have been performed using a specially designed burner. The temperature profiles were measured in gas phases by a microthermocouple technique. The burning surface temperature and the mass burning rates of solid fuel were determined. The chemical structure of counterflow flame was investigated using the mass spectrometric sampling by microprobe. The composition of the gas sample was analyzed on-line with a mass spectrometric complex (Hiden HPR 60), based on a quadrupole mass spectrometer. The species CH 2 O, CO, CO 2 , H 2 O, O 2 , N 2 were identified and their concentration profiles were measured. The composition of products and kinetic parameters of POM thermal degradation have been determined by mass spectrometry and thermogravimetric analysis. Quasi one-dimensionality of considered diffusion flame has been established experimentally, which allows analysis of flame parameters in relation to the only coordinate normal to the solid fuel's burning surface and substantially simplifies the theoretical description. Predictions have been performed by a coupled model describing feedback heat and mass transfer between gas-phase flame and polymeric solid fuel. A two-dimensional elliptic equation in axisymmetric formulation has been employed to simulate heat transfer in solid fuel, and a set of one-dimensional hyperbolic equations has been used to determine the solid-to-gas conversion degree of the pyrolysis reaction. Gas-phase formulation is presented by one-dimensional conservation equations for multi-component flow with a detailed kinetic mechanism of combustion. Numerical results showed good agreement with the measurements for temperature and species concentration profiles, as well as for the mass burning rate and the surface temperature of solid fuel.

KW - Counterflow combustion

KW - Coupled heat transfer

KW - Flame structure

KW - Numerical modeling

KW - Polyoxymethylene burning

KW - Pyrolysis kinetics

KW - FLAMMABILITY

KW - MECHANISM

KW - MOLECULAR-WEIGHT POLYETHYLENE

KW - POLY(METHYL METHACRYLATE)

KW - KINETICS

KW - NITROGEN

KW - DEGRADATION

KW - PYROLYSIS

KW - IGNITION

KW - EXTINCTION

UR - http://www.scopus.com/inward/record.url?scp=85064662314&partnerID=8YFLogxK

U2 - 10.1016/j.combustflame.2019.04.032

DO - 10.1016/j.combustflame.2019.04.032

M3 - Article

AN - SCOPUS:85064662314

VL - 205

SP - 358

EP - 367

JO - Combustion and Flame

JF - Combustion and Flame

SN - 0010-2180

ER -