The combustion characteristics of polymethyl methacrylate(PMMA) in the SFRJ were investigated using a direct tube test facility. The effect of factors, such as fuel port diameter, aft-mixing combustion chamber pressure, and air mass flow rate, on regression rate and performance was investigated. The pressure, temperature, local regression rate and their average value were got. The results show that the fuel mean regression rate decreases with the increase in fuel port diameter, but the aft-mixing combustion chamber pressure and temperature were enhanced. In addition, the pressure and temperature of aft-mixing combustion chamber decreased under the condition of low pressure (less than 0. 8 MPa) , but this effect was limited. It is first found that an erosion effect phenomenon is produced in the SFRJ combustion chamber when the fuel port diameter is smaller (Dp =30 mm).%为研究聚甲基丙烯酸甲脂(PMMA)在固体燃料冲压发动机(SFRJ)中的燃烧特性,开展了不同装药通道直径、补燃室压强、来流空气质量流率等工况下的SFRJ直连式实验研究.成功获得了不同工况下压强、温度的变化规律、燃面平均退移速率、局部燃面退移速率.实验结果表明:装药通道直径增大,燃面平均退移速率降低,但补燃室压强和温度随之增大；在低压(＜0.8 MPa)条件下,补燃室压强越低,燃面平均退移速率、补燃室温度均随之降低,但影响是有限的.同时,当装药通道直径较小(Dp=30 mm)时,首次发现了SFRJ的侵蚀效应现象.
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