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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (6): 065507.doi: 10.1088/2058-6272/aaac77

• Plasma Technology • Previous Articles     Next Articles

Effect of actuating voltage and discharge gap on plasma assisted detonation initiation process

 

Siyin ZHOU (周思引)1, Xueke CHE (车学科)1,2, Wansheng NIE (聂万胜)1 and Di WANG (王迪)1
  

  

  1. 1 Space Engineering University, Beijing 101416, People’s Republic of China
    2 Science and Technology on Scramjet Laboratory, Changsha 410073, People’s Republic of China
  • Received:2017-12-13 Published:2018-02-01
  • Supported by:

    This work was supported by National Natural Science Foundation of China with grant number 91441123, 51777214, and the Open Project of Science and Technology on Scramjet Laboratory with grant number CG-2014-05-118 under the technical monitor of program manager Dr Zhiyong Lin.

Abstract:

 The influence of actuating voltage and discharge gap on plasma assisted detonation initiation by alternating current dielectric barrier discharge was studied in detail. A loose coupling method was used to simulate the detonation initiation process of a hydrogen–oxygen mixture in a detonation tube under different actuating voltage amplitudes and discharge gap sizes. Both the discharge products and the detonation forming process assisted by the plasma were analyzed. It was found that the patterns of the temporal and spatial distributions of discharge products in one cycle keep unchanged as changing the two discharge operating parameters. However, the adoption of a higher actuating voltage leads to a higher active species concentration within the discharge zone, and atom H is the most sensitive to the variations of the actuating voltage amplitude among the given species. Adopting a larger discharge gap results in a lower concentration of the active species, and all species have the same sensitivity to the variations of the gap. With respect to the reaction flow of the detonation tube, the corresponding deflagration to detonation transition (DDT) time and distance become slightly longer when a higher actuating voltage is chosen. The acceleration effect of plasma is more prominent with a smaller discharge gap, and the benefit builds gradually throughout the DDT process. Generally, these two control parameters have little effect on the amplitude of the flow field parameters, and they do not alter the combustion degree within the reaction zone.

Key words: actuating voltage, discharge gap, dielectric barrier discharge, plasma assisted detonation, DDT