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硼颗粒在通过固体火箭冲压发动机的燃气发生器喷管进入补燃室的过程中,颗粒通常都会受到高速气流的作用。此时,静止条件下硼颗粒的燃烧模型不再适应。对强迫对流条件下的硼颗粒燃烧的二维问题建立了数学模型,通过物理、数学简化,将偏微分方程组化为易于求解的常微分方程组,最后得到燃烧速率的显示表达式,并进行了求解,给出了硼颗粒周围边界层内温度场、浓度场及颗粒燃烧速率随雷诺数Re的变化规律。
During the passage of boron particles into the afterburner through the gas generator nozzle of a solid rocket ramjet engine, the particles are usually exposed to the high velocity air flow. At this moment, the combustion model of boron particles under static conditions is no longer suitable. A mathematical model was established for two-dimensional combustion of boron particles under forced convection. By means of physics and mathematics simplification, the partial differential equations were transformed into easy-to-solve ordinary differential equations. Finally, the expression of combustion rate was obtained and carried out The temperature field, concentration field and particle burning rate in the boundary layer around the boron particle are given with the Reynolds number Re.