A mission analysis code was developed to perform a trade study on the effectiveness of liquefying bleed for the inlet of the first stage of a TSTO vehicle. By liquefying bleed, the vehicle weight (TOGW) could be reduced by 7 to 23%. Numerous simplifying assumptions were made and lessons were learned. Increased accuracy in future analyses can be achieved by: Including a higher fidelity model to capture the effect of rescaling (variable vehicle TOGW). Refining specific thrust and impulse models ( T m a and Isp) to preserve fuel-to-air ratio. Implementing LH2 for T m a and Isp. Correlating baseline design to other mission analyses and correcting vehicle design elements. Implementing angle-of-attack effects on inlet characteristics. Refining aerodynamic performance (to improve L/D ratio at higher Mach numbers). Examining the benefit with partial cooling or densification of the bleed air stream. Incorporating higher fidelity weight estimates for the liquefied bleed system (heat exchange and liquid storage versus bleed duct weights) could be added when more fully developed. Adding trim drag or 6-degree-of-freedom trajectory analysis for higher fidelity. Investigating vehicle optimization for each of the bleed configurations.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Liquefied Bleed for Stability and Efficiency of High Speed Inlets


    Contributors:

    Conference:

    NASA Aeronautics Research Institute (NARI) Seedling Fund Virtual Seminar ; 2014 ; Moffett Field, CA, United States


    Publication date :

    2014-04-04


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Liquefied Bleed for Stability and Efficiency of High Speed Inlets

    J. D. Saunders / D. Davis / S. J. Barsi et al. | NTIS | 2014


    Liquefied Bleed for Stability and Efficiency of High Speed Inlets

    Saunders, J. David / Davis, David / Barsi, Stephen J. et al. | NTRS | 2014


    Liquefied Bleed for Stability and Efficiency of High Speed Inlets

    J. D. Saunders / D. Davis / S. J. Barsi et al. | NTIS | 2014


    Bleed system design technology for supersonic inlets

    SYBERG, J. / KONCSEK, J. | AIAA | 1972


    Bleed System Design Technology for Supersonic Inlets

    Jan Syberg / Joseph L. Koncsek | AIAA | 1973