Calculation of coefficients of chemical reactions in a mixture of propane and air heated by microwave discharge plasma


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The short residence time of the fuel mixture in the working chamber of the propulsion system at supersonic flow rates significantly complicates its ignition. One of the promising directions related to ensuring stable ignition of fuel mixtures in a wide range of speeds is the use of nonequilibrium plasma created, for example, using a microwave discharge. The practical implementation of this direction requires a detailed analysis of the plasma-chemical reactions occurring in the fuel mixture and finding the coefficients of the corresponding reactions. To find the coefficients of chemical reactions in a mixture of propane and air, the solution of the kinetic equation for the electron energy distribution function at a given amplitude and frequency of the external electric field is considered. Electrons are heated by a uniform electric field, collide with the components of the mixture, and perform elastic and inelastic collisions, which are taken into account in the form of the dependence of the reaction cross section on the kinetic energy of the electrons. The results obtained, processed in the form of dependences of the coefficients of chemical reactions on the parameters of the external electric field, are of interest for modeling the microwave discharge plasma used to ignite the fuel mixture.

electronic energy distribution function, chemical reaction, reaction coefficient, propane-air mixture, impact cross section, microwave discharge

DOI: http://doi.org/10.33257/PhChGD.25.3.1104


Volume 25, issue 3, 2024 year


Расчет коэффициентов химических реакций в смеси пропана и воздуха, нагреваемой плазмой СВЧ-разряда

Малое время пребывания топливной смеси в рабочей камере двигательной установки при сверхзвуковых скоростях потока в существенной степени осложняет ее воспламенение. Одно из перспективных направлений, связанных с обеспечением устойчивого поджига топливных смесей в широком диапазоне скоростей, состоит в использовании неравновесной плазмы, созданной, например, при помощи СВЧ-разряда. Практическая реализация такого направления требует детального анализа плазмохимических реакций, протекающих в топливной смеси, и нахождения коэффициентов соответствующих реакций. Для нахождения коэффициентов химических реакций в смеси пропана и воздуха рассматривается решение кинетического уравнения для функции распределения электронов по энергиям при заданной амплитуде и частоте внешнего электрического поля. Электроны нагреваются однородным электрическим полем, сталкиваются с компонентами смеси, совершают упругие и неупругие соударения, которые учитываются в виде зависимости сечения реакции от кинетической энергии электронов. Полученные результаты, обработанные в виде зависимостей коэффициентов химических реакций от параметров внешнего электрического поля, представляют интерес для моделирования плазмы СВЧ-разряда, используемой для поджига топливной смеси.

функция распределения электронной энергии, химическая реакция, коэффициент реакции, пропано-воздушная смесь, сечение соударения, СВЧ-разряд

DOI: http://doi.org/10.33257/PhChGD.25.3.1104


Volume 25, issue 3, 2024 year



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