等离子体增强含硼燃气二次燃烧实验分析

为研究等离子体助燃条件下含硼燃气在补燃室的二次燃烧特性，建立了排除来流空气掺混效应的扩散燃烧实验模型。利用高速摄影仪拍摄了含硼燃气在补燃室的火焰照片，得到了有无等离子体条件下的燃烧火焰形貌；测量了补燃室不同截面的静压和总压，分析了有无等离子体条件下含硼推进剂在固冲发动机中的燃烧效率。实验结果表明：在含硼燃气二次燃烧过程中加入等离子体炬，等离子体炬后方区域火焰更加明亮，硼燃烧更加充分；断开等离子体炬后，补燃室静压和总压出现压力突降台阶，说明加入等离子体后可以加快化学反应速率，提高含硼燃气在固冲发动机中的燃烧效率，从而提高了补燃室的压强；且放电功率越高，含硼燃气在固冲发动机中燃烧效率的增长率越高。

Experimental analysis on plasma assisted secondary combustion of boron-based gas

In order to research the influence of plasma on the secondary combustion characteristic of boron-based gas in the afterburning chamber, a diffusion combustion experimental model which can exclude the mixing effect of intake air on the boron-based gas is designed and built. The flame image of boron-based gas secondary combustion is measured by the high-speed photographic apparatus to analyze the degree of brightness of the flame and the flame shape; the total pressure and static pressure of different cross-sections in the combustion chamber are measured to analyze the combustion efficiency of boron-based propellant under the influence of plasma. The results show that when adding plasma torch at the secondary combustion of boron-based gas, the combustion efficiency of boron-based gas increases and the boron-based flame is brighter; the abrupt decrease in the total pressure and static pressure appears when turning the plasma torch off. These show that the chemical reaction rate of boron-based gas increases with plasma, and the combustion efficiency of boron-based propellant in the solid rocket ramjet increases with plasma, which leads to the increase of the total pressure and static pressure with plasma; the combustion efficiency increases with the growth of discharge plasma power.