Stagnation and Jump Phenomenon of Separation Point by Step inside LE-7A Engine Nozzle

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  • ＬＥ－７Ａエンジンノズル内段差による剥離の停滞とジャンプの現象
  • LE 7A エンジン ノズルナイ ダンサ ニ ヨル ハクリ ノ テイタイ ト ジャンプ ノ ゲンショウ

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At an early stage of development, LE-7A engine suffered from high side loads. One of them was caused by the transition between Free Shock Separation (FSS) and Restricted Shock Separation (RSS), and the other was caused by the stagnation and sudden movement (‘jump’) of the separation point at a small step inside the nozzle extension. This paper focuses on this stagnation and jump phenomenon of separation point caused by the step inside LE-7A engine nozzle during the startup and shutdown transients.

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