Drag and heat transfer of metal and oxide agglomerates in flow of combustion products of solid propellant

Development of tools for modeling the motion of agglomerated particles with a complex composition and shape in a flow of combustion products is of interest for problems related to the description of the motion of the condensed phase in the internal channels of solid rocket motors. An approach is developed to simulate unsteady processes that occur when a viscous incompressible fluid flows around a particle consisting of an aluminum droplet and a condensed oxide particle attached to it. Methods for taking into account the sliding of the attached oxide particle over the surface of the aluminum droplet are pro-posed. The computational results are used to find the drag and heat transfer coefficients of a non-spherical particle at flow velocities corresponding to the formation of separation zones. The developed model is one of the components of a more general mathematical model designed for calculating two-phase flows of combustion products and created with a multi-scale approach to simulation of two-phase flows.

computational fluid dynamics, solid rocket nozzle, agglomeration, droplet

Volume 21, issue 1, 2020 year

Сопротивление и теплообмен маталл-оксидных агломератов в потоке продуктов сгорания твердого топлива

Создание средств моделирования движения частиц-агломератов, имеющих сложный состав и форму, в потоке продуктов сгорания представляет интерес для задач, связанных с описанием движения конденсированной фазы во внутренних каналах ракетных двигателей твердого топлива. Разрабатывается подход, предназначенный для моделирования нестационарных процессов, реализующихся при обтекании частицы, состоящей из капли алюминия и присоединенной к ней частицы конденсированного оксида, потоком вязкой несжимаемой жидкости. Предлагаются методы учета скольжения присоединенной частицы по поверхности основной частицы. Результаты расчетов используются для нахождения коэффициентов сопротивления и теплоотдачи частицы несферической формы при скоростях обтекания, соответствующих образованию отрывных зон. Построенная модель является одной из составных частей более общей математической модели, предназначенной для расчета двухфазных течений продуктов сгорания и построенной на основе многомасштабного подхода к расчету двухфазных течений.

вычислительная газовая динамика, двигатель, агломерация, капля

Volume 21, issue 1, 2020 year

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