论文部分内容阅读
为研究稀薄状态下固体火箭发动机羽流中颗粒的行为,在稀薄气相流场DSMC程序的基础上,添加了气固两相相互作用模型和颗粒相变模型。气固两相相互作用模型中,颗粒所受的作用由单个颗粒受到周围分子力和热作用公式求出,分子所受的作用由耦合求解气固相互作用方法求出,颗粒相变考虑固化、熔解,以及不发生相变的加热与冷却。用算例研究了流场的特性参数及不同粒径颗粒的温度分布,与文献数据符合良好,准确度在国内同类研究中具有一定的优势。在此基础上,针对实际固发羽流算例进行计算,分析了不同颗粒直径对流场的影响。结果表明:粒径越小颗粒扩散越开,X=0.4 m处粒径1μm颗粒的扩散较粒径100μm从0.03 m增大到0.2m;粒径越小颗粒温度降低越多,X=0.4 m处近轴线位置粒径1μm颗粒的温度较粒径100μm降低了44.4%;粒径越大,对气相流场阻碍作用越明显,X=0.02m处近轴线位置粒径100μm颗粒的速度较纯气相流场降低了54.5%。
In order to study the behavior of particles in the solid rocket engine plume under lean conditions, a gas-solid interaction model and a particle phase transition model were added to the DSMC program of lean gas-phase flow field. In the gas-solid two-phase interaction model, the effect of the particles is determined by the formula of the surrounding molecular force and thermal action of the individual particles. The interaction between the particles and the gas-solid interaction is solved by coupling and the phase transition of the particles is considered as solidification. Melting, and heating and cooling without phase change. The characteristics of the flow field and the temperature distribution of the particles with different particle sizes were studied by numerical examples. The results are in good agreement with the literature data and the accuracy has the advantage in similar studies in China. On this basis, the calculation of actual solid plume flow cases is carried out, and the influence of different particle diameters on the flow field is analyzed. The results show that the smaller the particle size, the more the particles spread. The particle size of 1 μm at X = 0.4 m increases from 0.03 μm to 0.2 μm, The temperature of particles with a diameter of 1μm near the axis is 44.4% lower than that with a particle size of 100μm. The larger the particle size, the more obstructive to the gas flow field. The particle with a diameter of 100μm near the axis of X = The flow field decreased by 54.5%.