采用CEA(Chemical Equilibrium with Applications)计算复合推进剂化学平衡组分及喷管入口参数,随后通过FLUENT对固体火箭发动机喷管-尾喷焰流场进行了一体化数值仿真。采用时间推进法及AUSM空间离散格式数值求解二维轴对称Navier-Stoke...采用CEA(Chemical Equilibrium with Applications)计算复合推进剂化学平衡组分及喷管入口参数,随后通过FLUENT对固体火箭发动机喷管-尾喷焰流场进行了一体化数值仿真。采用时间推进法及AUSM空间离散格式数值求解二维轴对称Navier-Stokes方程组,采用k-ε湍流模型模拟喷流与环境大气的掺混,并考虑了H2、CO、HCl在喷流流场中的二次燃烧,运用拉格朗日方法模拟Al2O3颗粒与喷流的相互作用。计算在不同高度和马赫数下展开,给出了不同情况下的流场分布。结果表明,H2、CO、HCl的二次燃烧对喷流流场影响显著;随着高度的增加,喷流流场影响域扩大;随着来流马赫数增加,喷流流场波节数降低。展开更多
One of the most important characteristic signatures of the exhaust plume from rocket motor is the aflerbuming phenomenon, and the injected water into the plume could inhibit the afterburning. The calculation model for...One of the most important characteristic signatures of the exhaust plume from rocket motor is the aflerbuming phenomenon, and the injected water into the plume could inhibit the afterburning. The calculation model for the gas-liquid multiphase flow field with chemical reaction in the plume is built. By inducing the energy source terms caused by the vaporization of liquid water, condensation of the vapor and chemical reaction in the energy equation, the gas-liquid multiphase flow field and the afterburning phenomenon are calculated in a coupling way. Mixture multiphase flow model is used to calculate the gas-liquid flow field, and the vaporization mechanism is used to investigate the water vaporization process. The temperature contours are obtained and accord well with the experimental photos. The mass fraction contours of primary species are obtained, which can indicate the extent of inhibition effect of water injection on the afterburning phenomenon in the plume. When water is injected into the plume, the region of aflerburning reduces a lot, and temperature on the ground wall declines rapidly, which can decrease the ablation of the combustion gas to the launch ground.展开更多
文摘采用CEA(Chemical Equilibrium with Applications)计算复合推进剂化学平衡组分及喷管入口参数,随后通过FLUENT对固体火箭发动机喷管-尾喷焰流场进行了一体化数值仿真。采用时间推进法及AUSM空间离散格式数值求解二维轴对称Navier-Stokes方程组,采用k-ε湍流模型模拟喷流与环境大气的掺混,并考虑了H2、CO、HCl在喷流流场中的二次燃烧,运用拉格朗日方法模拟Al2O3颗粒与喷流的相互作用。计算在不同高度和马赫数下展开,给出了不同情况下的流场分布。结果表明,H2、CO、HCl的二次燃烧对喷流流场影响显著;随着高度的增加,喷流流场影响域扩大;随着来流马赫数增加,喷流流场波节数降低。
文摘One of the most important characteristic signatures of the exhaust plume from rocket motor is the aflerbuming phenomenon, and the injected water into the plume could inhibit the afterburning. The calculation model for the gas-liquid multiphase flow field with chemical reaction in the plume is built. By inducing the energy source terms caused by the vaporization of liquid water, condensation of the vapor and chemical reaction in the energy equation, the gas-liquid multiphase flow field and the afterburning phenomenon are calculated in a coupling way. Mixture multiphase flow model is used to calculate the gas-liquid flow field, and the vaporization mechanism is used to investigate the water vaporization process. The temperature contours are obtained and accord well with the experimental photos. The mass fraction contours of primary species are obtained, which can indicate the extent of inhibition effect of water injection on the afterburning phenomenon in the plume. When water is injected into the plume, the region of aflerburning reduces a lot, and temperature on the ground wall declines rapidly, which can decrease the ablation of the combustion gas to the launch ground.
