LE-7Aエンジンの剥離現象とノズル内段差によるRSSの抑制法

概要

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LE-7A engine encountered two troubles at an early stage of development, associated with the extension of the nozzle. One of them is large side loads during start up and shut down and the other is the damage on the nozzle tube, both caused by the occurrence of Restricted Shock Separation (RSS). The largest side load occurred when the separation point jumped from the nozzle cooling step inside the nozzle to the nozzle exit, after the stagnation of the separation point at the step. These phenomena such as ‘the RSS annihilation and occurrence’ and ‘the separation stagnation and jump’ indicate a significant suggestion for the RSS suppression by a small step inside the nozzle. This paper presents a focus on the LE-7A engine specific separation phenomena during the startup and shutdown transients and a method of RSS suppression with a step inside nozzle.
社団法人日本航空宇宙学会の論文
2007-10-05