MMH/NTO injection and ignition in vacuum downstream from an Aestus engine single injection element
MMH/NTO injection and ignition in vacuum downstream from an Aestus engine single injection element
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Aestus 发动机单喷射元件下游的 MMH/NTO 喷射和真空点火
DOI：
10.1016/j.ast.2003.11.001
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. d’Herbigny
中科院分区：
文献类型：
--
作者：
R. Lecourt;F. d’Herbigny
为了研究在Aestus发动机实际条件下，MMH和NTO推进剂在Aestus发动机单元件喷射器下游真空条件下喷射和点火的物理现象，进行了MMH和NTO推进剂的喷射和点火实验研究。激光片技术被用于可视化有窗燃烧室中的现象，通过声道连接到真空罐。喷油器和燃烧室安装了大带宽温度和压力传感器，以精确跟踪非定常现象。本文叙述了各推进剂单独喷射的情况，以及它们一起喷射时的点火情况。低压条件（200 hPa）对MMH注入没有影响。相反，当在真空（5hpa）中注入时，NTO喷雾会发生强烈的改性。由于使用了氧化剂注入引线程序，点火总是很顺利的，并且完全受MMH流量的支配。最后，由于氧化剂注入引线程序，当该阀门打开时，在MMH歧管中观察到MMH和NTO蒸汽之间频繁的预点火。根据实验条件，这些预点火是平稳的，有限的或陡峭的。
An experimental study of the injection and ignition of MMH and NTO propellants injected under vacuum conditions downstream from an Aestus rocket-engine single element injector was undertaken to investigate the physical phenomena occurring during the first steps of injection and ignition in the actual conditions of the Aestus engine. A laser sheet technique was used to visualize the phenomena in a windowed combustion chamber, connected, through a sonic throat, to a vacuum tank. The injector and the combustion chamber were equipped with large bandwidth temperature and pressure transducers to follow accurately the unsteady phenomena. The paper describes the injection of each propellant injected alone and then their ignition when they are injected together. The low pressure conditions (200 hPa) have no influence on the MMH injection. On the contrary, the NTO spray is strongly modified when injected in vacuum (5 hPa). Ignition is always smooth because of the oxidizer injection lead procedure used and totally ruled by the MMH flow rate. Finally, because of the oxidizer injection lead procedure, frequent pre-ignitions between MMH and NTO vapor are observed in the MMH manifold when this valve is opened. According to the experimental conditions, these pre-ignitions are smooth and limited or steep.