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Modeling of Plasma Assisted Combustion in Premixed Supersonic Gas Flow

机译：预混合超声速气流中等离子体辅助燃烧的建模

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摘要

A model for plasma assisted combustion of ethylene-air mixtures at conditions typical for scramjet combustion chamber is developed combining classical mechanisms of thermal combustion with non-thermal plasma chemistry. Numerical simulations showed that sufficiently strong reduction of ignition induction time at a reasonable energy cost can be realized with help of filamentary discharges. Starting from the discharge region, the gas mixture is heated due to exothermic reactions involving atomic oxygen and secondary chemical radicals. Temperature increment to the end of this stage for ethylene-air mixture is relatively small. An important effect of this stage is not heating but production of transient species. Then, a period with slow growth of temperature follows, which terminates by fast combustion. Processes causing the first fast growth of gas temperature are analyzed, and intermediate species controlling acceleration of ignition are determined numerically for plasma assisted combustion of stoichiometric mixture of ethylene with air. The value of the calculated induction time defined as a moment of the fast combustion is rather sensitive to the particular combustion mechanism adopted. This manifests a necessity to refine combustion mechanisms for conditions typical for scramjet combustion chamber with plasma initiation - one atmosphere pressure, static gas temperature around 700 K and appearance of atomic oxygen.
机译：结合经典的热燃烧机理和非热等离子体化学原理，开发了在超燃冲压燃烧室典型条件下乙烯-空气混合物的等离子体辅助燃烧模型。数值模拟表明，借助丝状放电，可以在合理的能源成本下大大降低点火诱导时间。从放电区域开始，混合气体由于涉及原子氧和第二化学自由基的放热反应而被加热。乙烯-空气混合物至该阶段结束时的温度升高相对较小。该阶段的重要作用不是加热而是产生过渡物种。然后，出现温度缓慢增长的时期，该时期因快速燃烧而终止。对导致气体温度首次快速升高的过程进行了分析，并通过数值确定了控制点火加速的中间物种，以进行乙烯与空气的化学计量混合物的等离子体辅助燃烧。定义为快速燃烧时刻的计算出的感应时间的值对所采用的特定燃烧机制相当敏感。这表明有必要针对超燃冲压发动机燃烧室典型的带有等离子体引发的条件（一种大气压，700 K左右的静态气体温度和原子氧的出现）改进燃烧机制。

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  • 来源
    《International journal of hypersonics》 |2010年第4期|p.209-223|共15页
  • 作者

    Maxim A. Deminsky; Igor V. Kochetov; Anatoly P. Napartovich; Sergey B. Leonov;

  • 作者单位

    State Research Center RF "Kurchatov Institute", Moscow, Russia;

    State Research Center RF Troitsk Institute for Innovation and Thermonuclear Research (TRINITI), Troitsk, Moscow region, Russia;

    State Research Center RF Troitsk Institute for Innovation and Thermonuclear Research (TRINITI), Troitsk, Moscow region, Russia;

    Joint Institute for High Temperature RAS, Moscow, Russia;

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