Abstract It is a key and difficult problem to find the optimal powder-feeding technique in the study of powdered engines. In this paper, the feeding of powder in powder engines at different gas-solid ratios was experimentally investigated. Working characteristics of the classic piston-driven powder feeding system were obtained. A high linear tendency between powder mass flow rate and the minimum throttle channel area is observed from the experiment. The solid-gas mass ratio to maintain a stable powder feeding is approximately valued in range of 34.4–54.6 under different throttle channel areas. The least deviation in the relative powder mass flow rate for the tests is −15% to +8%. Due to the high uncertainty of the gas-solid flow structures at different gas-solid ratios, obvious low-frequency oscillations and high-frequency oscillations exist during the powder feeding process. The frequencies of low-frequency oscillations are mainly 1–3 Hz, while those of high-frequency oscillations are 20–30 Hz and 30–45 Hz in different tests.

    Highlights The feeding process in a powder engine under different gas-solid ratios was experimentally investigated. The oscillation phenomenon may be an inherent defect in the classic piston-driven powder-feeding system. The deviation in the relative powder mass flow rate for the most smooth and steady test is −15% to +8%. A high linear tendency between powder mass flow rate and the minimum throttle channel area is observed.


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    Title :

    Powder feeding in a powder engine under different gas-solid ratios


    Contributors:
    Li, Chao (author) / Zhu, Xiaofei (author) / Deng, Zhe (author) / Yang, Jiangang (author) / Hu, Chunbo (author) / Wei, Jinjia (author)

    Published in:

    Acta Astronautica ; 189 ; 712-721


    Publication date :

    2021-08-15


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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