A combination of computer analysis and scale model testing was utilized to compare the entrainment rates of a variety of jet mixer nozzles. The objective of the study was to develop a nozzle which would increase the performance of thrust augmenting ejectors on V/STOL aircraft. Various multi-lobe and vortex generating nozzles were devised and studied. The spreading of the jet from each nozzle was predicted by calculating a finite-difference solution of Reynolds' equations for the three dimensional flow field. A two-equation turbulence kinetic energy model was used for closure. Limited experimental testing was then performed to verify the predicted trends. It was concluded that increasing the length of the nozzle lobes produces the greatest increase in thrust augmentation, and that an alternating slot nozzle yields the greatest augmentation for a given lobe size. (Author)


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    Title :

    Computer-Aided Design Study of Hypermixing Nozzles


    Contributors:

    Publication date :

    1978


    Size :

    85 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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