Model of a two-phase turbulent jet with heterogeneous particle combustion taken into account

Numerical simulation of aerodynamics and combustion of a gas mixture in a channel with sudden expansion

“…2). This zone disappears with distance from the combustion chamber entrance, and the flow is directed in the positive direction of the Ox axis in the entire volume of the combustion chamber already at x = 0.3 m. The formation of the backflow zone in a swirled flow is related to rarefaction in the vicinity of the axis, which is induced by enhancement of the radial motion of the gas in the field of centrifugal forces and is typical for swirled flows [4,26]. Gas exhaustion from the combustion chamber mainly occurs in an annular region whose inner radius r k gradually increases with distance from the input section.…”

“…The local characteristics of the flow and combustion in a channel with sudden expansion were calculated in a similar manner [4]. The equations of motion for the gas phase were the Euler equations under the assumption of the minor influence of local discontinuities in the flow due to the presence of condensed aluminum particles in the gas.…”

“…As the dependence for the Nusselt number, we used the formula [2,4] Nu = 2 + 0.16Re 2/3 r . The estimates showed that the contribution of the radiative component to the thermal balance equation for particles smaller than 3 μm in diameter does not exceed 1%, which agrees with the estimates made in [19].…”

“…System (1), (2), (4)-(11), (15) was solved numerically by the methods considered in [4]. The calculations were performed on a grid with 210 nodes in the axial direction and 176 nodes in the radial direction.…”

“…Flows of gas mixtures with burning condensed (solid or liquid) particles in channels and jets were calculated in various formulations of the problem (see, e.g., [2][3][4][5]). Two-phase flows with completely gaseous products of combustion of solid or liquid particles were considered in most publications.…”