Mathematical modeling of working processes in afterburner ramjet on pyrotechnic composition

• Main Authors: V. A. Sorokin, D. M. Yagodnikov, I. I. Khomajakov, S. A. Suchkov, A. V. Sukhov
• Format: Article
• Language: Russian
• Published: MGTU im. N.È. Baumana 2014-01-01
• Series: Nauka i Obrazovanie
• Subjects: combustion chamber; 3-d mathematical model; numerical calculation; the combustion chamber; boron
• Online Access: http://technomag.edu.ru/jour/article/view/627

The article presents mathematical modeling of the workflows in the combustion chamber of the ramjet (RJ) model, taking into account the geometric characteristics of the latter, parameters of air, and gas generation products. It provides formation of the computational domain with the airflow supply in the afterburner chamber at the angle of 45° to the axis of the latter, and at 45o angle to the RJ plane of symmetry. Calculations are made on the clusters «HyperBlade T-ForgeHB-20", using the software complex HyperFLOW 3D», developed at Bauman Moscow State Technical University and based on the solution of systems of nonstationary two- and three-dimensional differential equations for gas (k-ε turbulence model in the Eulerian coordinate system) and the dispersed phase particles (Lagrangian coordinate system) using the parallel computing and automatic spatial partitioning calculated region. The total number of active nodes of computational cells is ~ 2.2 million; a size of the elementary volume is 5.2 x 1.8 x 1.8 mm. The k-phase available in the gasification products is represented by the polifractional distribution of fuel particles based on the alloy of aluminum and boron, their interaction with atmospheric oxygen being modeled via the integral reaction considering the heat proportional to the residence time of particles of each fraction. For the first time the ignition and combustion of boron fuel polifraction particles in the air stream are computationally studied at various initial values of operating condition of RJ model. The article examines peculiarities of movement and combustion of single-fraction particles in the afterburner chamber, which are a part of the polifraction mixture of condensed particles of gasification products. It also constructs the trajectories and presents the mass concentrations of a particles stream of single-fractions, temperature fields of the gas phase of velocity and oxygen concentration, determines the complete combustion of the fuel particles along the length of boron afterburner, depending on the coefficient of excess oxidant. The possibility for organizing an effective workflow in the gasifier and RJ afterburner has been proved.