Моделирование радиационно-конвективного нагрева модельных камер ПВРД на водородном и углеводородном топливе


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Simulation of radiation-convective heating of model cameras of ramjets on hydrocarbon and hydrogen fuels

Convective and radiative heating of internal surfaces of hypersonic ramjet combustion chambers (scramjets) are studied by numerical simulation.
Three kinds of scramjet chambers are considered: the dual-mode scramjet with a flame stabilizer, having form of an asymmetrical trapezoidal cavity, the combustion chamber of the experimental model "SCHOLAR", as well as the camera of hypothetical scramjet of axisymmetric shape.
Fields of chemical species concentrations, pressure and temperature calculated by the two-dimensional computer model based on the unsteady Navier-Stokes equations, energy conservation and diffusion equations together with the system of equations of chemical kinetics. On the basis of the thermic and chemical properties the spectral optical properties of the products of combustion are calculated. Solution of the equation of radiation heat transfer with the use of multi-group spectral model completes the calculation procedure.
In addition to solving the problem of radiative-convective heating of the inner surface of the scramjet cameras solved the problem of ignition of different fuels in the scramjet models and study of different kinds of gas-dynamic structures. Simplified kinetic combustion model were used, which nevertheless fairly wide spread in literature.
Found that certain flow regimes are non-stationary and radiative heating of the surface as a whole is not determinative, although in some parts of the surface the contribution of radiation heating into the total heating can be significant (especially with increasing pressure and with increasing the chamber dimension).

scramjet, ramjets, radiation-convection heating, dual-mode scramjet combustion chamber SCHOLAR, scramjet axially symmetric shape, a two-dimensional computer model, unsteady Navier-Stokes equations, spectral optical properties of combustion products, the selective transfer of thermal radiation inside the scramjet chambers


Том 15, выпуск 3, 2014 год



Конвективный и радиационный нагрев внутренних поверхностей трех модельных камер гиперзвуковых прямоточных воздушно-реактивных двигателей (ГПВРД) изучаются с помощью численного моделирования.
Рассмотрена камера двухрежимного ГПВРД со стабилизатором пламени, выполненным в виде каверны несимметричной трапецеидальной формы, камера сгорания экспериментальной энергетической установки SCHOLAR, а также камера гипо-тетического ГПВРД осесимметричной формы.
Поля концентраций химических веществ, давления и температуры рассчитываются по двумерной вычислительной модели, основанной на нестационарных уравнениях Навье-Стокса, сохранения энергии и уравнений диффузии совместно с системой уравнений химической кинетики. На их основе вычисляются поля спектральных оптических свойств продуктов сгорания, а затем рассчитывается перенос селективного теплового излучения внутри камер ГПВРД.
Помимо решения задачи о радиационно-конвективном нагреве внутренней поверхности камер ГПВРД решалась задача о воспламенении разных видов топлив в исследуемых модельных ГПВРД и о термогазодинамической структуре продуктов сгорания. При этом использовались весьма упрощенные кинетические модели горения, которые, тем не менее, достаточно широко распространены в литературе и хорошо апробированы.
Установлено, что некоторые режимы течения являются нестационарными, а радиационный нагрев поверхности в целом не является определяющим, хотя на некоторых участках поверхности его вклад в суммарный нагрев может оказаться заметным (при увеличении давления в камере сгорания и увеличении ее поперечных размеров).

гиперзвуковой прямоточный воздушно-реактивный двигатель, ГПВРД, радиационно-конвективный нагрев, двухрежимный ГПВРД, камера сгорания SCHOLAR, ГПВРД осесимметричной формы, двумерная вычислительная модель, нестационарные уравнения Навье?Стокса, спектральных оптических свойств продуктов сгорания, перенос селективного теплового излучения внутри камер ГПВРД


Том 15, выпуск 3, 2014 год



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