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介绍的固体燃料冲压发动机由产生反应气体的预燃室和产生最终燃烧气体的冲压燃烧室组成。在预燃室与冲压燃烧室之间没有壅塞流。因此,两个燃烧室之间没有压力差,燃烧室压力由从与冲压燃烧室相连的进气道引入的空气流决定。试验的固体燃料采用高氯酸铵(AP)氧化剂,端羧基聚丁二烯(CTPB)燃料。为了提高比冲(Isp),在固体燃料中加入了硼(B)粉。硼粉的加入使燃速得到了显著的提高,并且降低了维持自身燃烧的低压极限。这是由于硼粉在燃料燃烧表面的氧化反应释放热量引起的。根据在直连试验设备上所得的燃烧试验结果,评价了在各种空气流条件下固体燃料冲压发动机的燃烧特性。
The introduced solid fuel ramjet engine consists of a pre-combustion chamber that produces a reactive gas and a ram-firing chamber that produces the final combustion gas. There is no choking flow between the pre-chamber and the ram-combustion chamber. Therefore, there is no pressure difference between the two combustion chambers, the pressure of the combustion chamber being determined by the flow of air introduced from the intake connected to the ram combustion chamber. The solid fuel tested was ammonium perchlorate (AP) oxidizer, terminal carboxyl polybutadiene (CTPB) fuel. In order to increase Isp, boron (B) powder is added to the solid fuel. With the addition of boron powder, the burning rate has been significantly improved, and the low pressure limit for maintaining self-combustion has been reduced. This is due to the release of heat from the oxidation reaction of the boron powder on the combustion surface of the fuel. The combustion characteristics of the solid fuel ramjet engine under various airflow conditions were evaluated based on the combustion test results obtained on the direct-attach test equipment.