固体火箭发动机潜入和非潜入喷管内流场模拟及对比

利用FLUENT流场计算软件,对采用潜入和非潜入喷管的全尺寸固体发动机,采用二维轴对称模型和准定常方法进行了内流场模拟计算和对比分析.结果表明,喷管潜入结构可有效地降低发动机后封头壁面附近的燃气速度,从而比非潜入发动机有更好的热防护环境;两种发动机在燃烧室内压强、速度和温度分布大致相同,非潜入喷管发动机在喷管出口轴线处燃气速度比潜入喷管发动机的大,而温度和压强较低.

Simulation and comparison of internal flow fields in solid rocket motors with submerged and nonsubmerged nozzle

Based on FLUENT flow field calculation software, internal flow fields of full-size motors with submerged nozzle and nonsubmerged nozzle were simulatively calculated and compared by using 2D axisymmetric model and quasi-steady method. The results show that the configuration of submerged nozzle can effectively reduce gas velocity near the aft-dome case, and has better heat security environment. Pressure, velocity and temperature distributions in the chamber of both motors are approximately same. Gas velocity in outlet of the nonsubmerged nozzle motor is higher than that of the submerged nozzle motor,but gas temperature and pressure are lower.