Recently,the 180k N LOX/kerosene staged combustion cycle engine,the second-stage engine of LM-7 developed by the Xi’an Aerospace Propulsion Institute,successfully completed a 400s test run under rated conditions.The test,following the vibration test during the first-stage flight phase,fully demonstrated the high reliability and environmental adaptability of the engine,marking that the secondstage engine had stepped forward to Recently, the 180k N LOX / kerosene staged combustion cycle engine, the second-stage engine of LM-7 developed by the Xi’an Aerospace Propulsion Institute, successfully completed a 400s test run under rated conditions. The test, following the vibration test during the first-stage flight phase, fully demonstrated the high reliability and environmental adaptability of the engine, marking that the secondstage engine had stepped forward to