中文摘要：

在过膨胀状态下,研究了大膨胀比单膨胀斜面喷管（single expansion ramp nozzle,SERN）内部三维流场和性能及无源腔结构对SERN内部流场和性能的影响。结果表明,原型喷管在低落压比范围4~10内,二维模型所计算的轴向推力系数比三维带侧壁后体喷管构型偏大。无源腔结构的存在促进SERN上膨胀斜面流动的分离,影响SERN喷管上膨胀斜面压力分布,从而提高SERN的轴向推力系数。在相同的开孔率条件下,两种的孔板形式的无源腔结构对喷管性能影响基本相同。

英文摘要：

Under over-expansion condition, the internal three-dimension flow field and performance of single expansion ramp nozzle （SERN） with large expansion ratio were explored, the effect of passive cavity on the SERN was investigated. Results show： for the baseline SERN, in low pressure ratio range of 4 to 10, the axial thrust coefficient predicted by two dimensional model is larger than that it has for the three -dimensional model with sidewall. The passive cavity promotes the flow separation on the expansion ramp of SERN, and effects the pressure distribution of the expansion ramp, as a result, the axial thrust coefficient can be improved. Two different porous plate models are investigated under same percent of porosity condition. Results show different porous plates have the same effects on the passive cavity SERN.