Abstract In order to explore the impact of gas temperature on the nozzle damping characteristics of solid rocket motor, numerical simulations were carried out by an experimental motor in Naval Ordnance Test Station of China Lake in California. Using the pulse decay method, different cases were numerically studied via Fluent along with UDF (User Defined Functions). Firstly, mesh sensitivity analysis and monitor position-independent analysis were carried out for the computer code validation. Then, the numerical method was further validated by comparing the calculated results and experimental data. Finally, the effects of gas temperature on the nozzle damping characteristics were studied in this paper. The results indicated that the gas temperature had cooperative effects on the nozzle damping and there had great differences between cold flow and hot fire test. By discussion and analysis, it was found that the changing of mainstream velocity and the natural acoustic frequency resulted from gas temperature were the key factors that affected the nozzle damping, while the alteration of the mean pressure had little effect. Thus, the high pressure condition could be replaced by low pressure to reduce the difficulty of the test. Finally, the relation of the coefficients “alpha” between the cold flow and hot fire was got.

    Highlights A pulsed method was provided to study the nozzle acoustic energy damping. The impact of gas temperature on the nozzle damping and its mechanism were studied. The relation of the coefficients “alpha” between the cold flow and hot fire was got.


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    Titel :

    Effects of gas temperature on nozzle damping experiments on cold-flow rocket motors


    Beteiligte:
    Sun, Bing-bing (Autor:in) / Li, Shi-peng (Autor:in) / Su, Wan-xing (Autor:in) / Li, Jun-wei (Autor:in) / Wang, Ning-fei (Autor:in)

    Erschienen in:

    Acta Astronautica ; 126 ; 18-26


    Erscheinungsdatum :

    2016-02-01


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch