Abstract Powder supply system is the key component of powder engines with multiple ignition capability, and thrust modulation function. Similar to the pure gas phase, the gas-solid two-phase flow in powder engines also has a choking phenomenon. The powder pneumatic conveying experiments at choked mode and non-choked mode were carried out to compare their conveying characteristics. In the choked mode (mode A and mode B), when the initial pressure of the fluidization chamber is higher than the pressure in the stable stage, the powder supply system is prone to flow peaks. In the choked mode A where the amount of fluidization gas is determined by the area of the throttle channel, the powder supply system is prone to fluctuations, and the frequency and amplitude of the fluctuation are related to the throttle channel area. The choked mode A has good repeatability and flow regulation performance when the throttle channel area is large. Employing pressure simulator and wavelet analysis, the transition from choked flow to non-choked flow was achieved and the effective frequency (<20 Hz) of the powder supply system is obtained. Experimental results and theoretical analysis show that powder flow has an upper limit in the non-choked mode.

    Highlights A semi-empirical model of powder mass flow rate at non-choked mode is established. Reveals the mechanism of powder flow peak at choked mode. The effective frequency of the powder supply system is obtained. A new method to study the critical pressure ratio of gas-solid two-phase flow. Propose two methods to adjustment powder mass flow rate.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Experimental investigation on the starting and flow regulation characteristics of powder supply system for powder engines


    Contributors:
    Yang, Jiangang (author) / Hu, Chunbo (author) / Qiang, Wei (author) / Hu, Jiaming (author) / Hu, Xu (author) / Zhu, Xiaofei (author)

    Published in:

    Acta Astronautica ; 180 ; 73-84


    Publication date :

    2020-12-03


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English







    STARTING GAS TURBINE ENGINES

    MOORE GARETH E / DAVIES PAUL R / HUSBAND STEPHEN M et al. | European Patent Office | 2023

    Free access

    Starting of airplane engines

    Naquet, P. / Desgranges, J. | Engineering Index Backfile | 1931