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A. A. Bolkisev

Bio: A. A. Bolkisev is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Flame spread & Combustion. The author has an hindex of 3, co-authored 5 publications receiving 33 citations.

Papers
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Journal ArticleDOI
01 Jan 2019
TL;DR: In this article, a coupled model of heat and mass transfer involving two-dimensional elliptic conservation equations both for gas phase and solid fuel has been used with the fuel surface approximation of the samples burnout.
Abstract: This study presents the results of a comprehensive experimental investigation and numerical simulation of the downward flame spread over PMMA slabs. For the first time, in the case of downward flame spread over PMMA slab 9.6 mm thick, temperature and species concentration fields in the gas-phase flame, temperature profiles in the condensed phase and dependence of the heat flux to the burning surface on the distance from the flame front were obtained. A coupled model of heat and mass transfer involving two-dimensional elliptic conservation equations both for gas phase and solid fuel has been used with the fuel surface approximation of the samples burnout. This allowed us to state, for the indefinite intermediate mode (in terms of the sample thickness, which are not neither thermally thin nor thermally thick), a mathematical model ensuring good agreement between the experimental and calculated macro parameters of combustion. The results of comparing the experimental and calculated data allowed us to determine a number of facts, which, despite the satisfactory agreement between the simulation and the experimental data in the main macro parameters, indicate the necessity of further improvement of the model derived. Such facts are: the increasing disagreement between the calculation and the experiment in the position of the maxima of the temperature in the gas phase as the distance from the flame front grows; essential difference in the width of the MMA and O2 consumption zone between the calculation and the experiment; identification in the experiment of CO as an intermediate product. Further improvement of the model should be aimed at more detailed development of the combustion reaction mechanism, which should consider at least two steps.

24 citations

Journal ArticleDOI
TL;DR: In this paper, a coupled model of heat and mass transfer describing the feedback between gas-phase flame and solid fuel has been defined by non-stationary two-dimensional elliptic equations applied both for gas phase and liquid fuel.

17 citations

Journal ArticleDOI
01 Nov 2019-Fuel
TL;DR: In this article, a coupled heat and mass transfer model including two-dimensional elliptical equations both in the gas phase and solid fuel was proposed to study the downward flame spread over PMMA surface.

17 citations

Journal ArticleDOI
TL;DR: Two versions of numerical methods for solving systems of chemical kinetics which are based on quasi-steady state and partial equilibrium approximations are presented, which ensure the conservation of mass and the fulfillment of stoichiometric relations, which enables the timestep considerably.
Abstract: The paper presents two versions of numerical methods for solving systems of chemical kinetics which are based on quasi-steady state and partial equilibrium approximations. These methods are explicit and guarantee that the solutions are positive and bounded for an arbitrary period of time. In contrast to the existing methods, they ensure the conservation of mass and the fulfillment of stoichiometric relations, which enables us to increase the timestep considerably while keeping the same accuracy.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the activation energy, preexponential factor, and pre-exponential energy were obtained of a one-step pyrolysis reaction in supposition of a first-order reaction using simple mathematical fitting and an iso-conversion method.

52 citations

Journal ArticleDOI
TL;DR: In this article, the differences between cast and extruded PMMA on a property-specific level are investigated, and whether the differences justify unique pyrolysis models for each type of PMMA.

22 citations

Journal ArticleDOI
01 Nov 2019-Fuel
TL;DR: In this article, a coupled heat and mass transfer model including two-dimensional elliptical equations both in the gas phase and solid fuel was proposed to study the downward flame spread over PMMA surface.

17 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the combined effects of orientation and environmental pressure on flame characteristics, steady burning experiments of inclined polymethyl methacrylate (PMMA) slabs were conducted at reduced environmental pressures ranging from 0.5 to 1 atm.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the influence of the initial size of fuel particles on the main process parameter, namely the ignition delay time, for a group of gel fuel compositions.

12 citations