A description is given of a simple procedure for predicting the static performance of low pressure-ratio thrust-augmenter ejectors equipped with hypermixing primary nozzles. Such ejectors have been proposed as vertical, and transitional, flight mode thrust augmenters for VTOL aircraft. The analysis is based on incompressible flow concepts employed in such a way that the thrust augmentation ratio is evaluated with negligible error. Results are presented of a parametric, computer generated, study showing the sensitivity of the optimised performances of a basic ejector configuration to changes in loss coefficients, area ratio and operating conditions. It was concluded that it is most important to achieve the highest possible effectiveness of the ejector diffuser and that ejectors with large area ratios are particularly adversely affected by back pressure. Comparisons of predictions made using the analytical procedure with experimental results generated by ARL show good agreement. (Kursetz)


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    Title :

    The prediction of the performance of low pressure-ratio thrust-augmentor ejectors


    Additional title:

    Eine Vorausbestimmung des Verhaltens von Niederdruck-Schubduesensystemen mit Schubverstaerkung


    Contributors:

    Published in:

    Publication date :

    1978


    Size :

    10 Seiten, 15 Bilder, 1 Tabelle, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English