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  • Development Status of the Cryogenic Oxygen/Hydrogen YF-77 Engine for Long-March 5

    Paper number

    IAC-13,C4,1,2,x17679

    Author

    Mr. Weibin Wang, China

    Coauthor

    Mr. Dayong Zheng, Beijing Aerospace Propulsion Institute, China

    Coauthor

    Ms. Guiyu Qiao, China

    Year

    2013

    Abstract
    The YF-77 engine, designed by the Academy of Aerospace Propulsion Technology (AALPT), China, is a high performance and reliability LH2/LO2 booster designed for the next-flagship Chinese launch vehicle, called Long-March 5.
      Two YF-77 engines fly on the core stage of the Long-March 5 launch vehicle. The engine utilizes a gas generator cycle, and each engine provided 700-kN at an oxidizer-to-fuel mixture ration (O/F) of 5.5. Issues resolved by design modifications and stricter quality control during development include bearing and seal wear as well as fuel trubopump rotor crack, chamber damage due to combustion instability, exi;osive fuel leaks, and etc. The reliability and safety of YF-77 is well demonstrated before its maiden journey.
       This discussion will cover engine system design and operating characteristics as well as component design and operating characteristics of the YF-77. The scope of testing perfoemed to qualify this engine for flight is also included.
    Abstract document

    IAC-13,C4,1,2,x17679.brief.pdf

    Manuscript document

    IAC-13,C4,1,2,x17679.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.