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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (9): 2721-2728.doi: 10.7527/S1000-6893.2015.0350

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Experimental analysis on plasma assisted secondary combustion of boron-based gas

ZHANG Peng1, HONG Yanji1, DING Xiaoyu1, JI Hailong2   

  1. 1. State Key Laboratory of Laser Propulsion & Application, Equipment Academy, Beijing 101416, China;
    2. Science and Technology on Combustion, Internal Flow and Thermal-Structure Laboratory, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2015-09-13 Revised:2015-10-25 Online:2016-09-15 Published:2016-01-30
  • Supported by:

    National Natural Science Foundation of China (11372356)

Abstract:

In order to research the influence of plasma on the secondary combustion characteristic of boron-based gas in the afterburning chamber, a diffusion combustion experimental model which can exclude the mixing effect of intake air on the boron-based gas is designed and built. The flame image of boron-based gas secondary combustion is measured by the high-speed photographic apparatus to analyze the degree of brightness of the flame and the flame shape; the total pressure and static pressure of different cross-sections in the combustion chamber are measured to analyze the combustion efficiency of boron-based propellant under the influence of plasma. The results show that when adding plasma torch at the secondary combustion of boron-based gas, the combustion efficiency of boron-based gas increases and the boron-based flame is brighter; the abrupt decrease in the total pressure and static pressure appears when turning the plasma torch off. These show that the chemical reaction rate of boron-based gas increases with plasma, and the combustion efficiency of boron-based propellant in the solid rocket ramjet increases with plasma, which leads to the increase of the total pressure and static pressure with plasma; the combustion efficiency increases with the growth of discharge plasma power.

Key words: plasma torches, ducted rocket engines, boron, afterburning chamber, diffusion flames

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