N-Decane Reforming by Gliding Arc Plasma in Air and Nitrogen
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N‑Decane Reforming by Gliding Arc Plasma in Air and Nitrogen Feilong Song1 · Yun Wu1,2 · Shida Xu1 · Xingkui Yang1 · Yuanbo Xuan3 Received: 2 June 2020 / Accepted: 27 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Plasma cracking of n-decane is carried out in a new type of gliding arc flow reactor in the atmosphere of nitrogen and air, at a flow range of 25–45 L/min with an interval of 5 L/min. The relationship between arc evolution and discharge voltage and current signals is established by synchronous recording with high-speed camera and oscilloscope. It is recorded that the rotating frequency of the gliding arc is in the range of 81–176 Hz, which increases with the rise of the flow rate and has no direct relationship with the type of gas. When air is used as the discharge medium, although the luminous intensity of the arc is weak, arc rotation is relatively stable, and the specific input energy is higher, which is 58% higher than that of nitrogen. In addition, the partial oxidation of n-decane provides extra heat for cracking, which is helpful to improve the efficiency of plasma cracking. The cracking products mainly include hydrogen, ethylene, acetylene, methane, propylene and ethane. The concentration of each component is higher, reaching the maximum value at the flow rate of 40 L/ min, with the hydrogen selectivity of 23.1%. However, when nitrogen plasma is selected, the kinds of products are reduced, containing only hydrogen, ethylene and acetylene, and the concentrations are lower than 0.5%. Two parameters, energy conversion efficiency and carbon based characterization effective cracking rate, were proposed to evaluate the cracking effect of flow reactor. Keywords N-decane · Cracking · Gliding arc plasma · Selectivity
Introduction The traditional rotating detonation combustor (RDC) is an annular combustor. The detonation wave propagates along the circumferential direction and the combustion products are discharged in the axial direction. Compared with the traditional Brayton cycle, * Yun Wu [email protected] 1
Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, China
2
Institute of Aeroengine, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
3
Aeronautics Engineering College, Air Force Engineering University, Xi’an 710038, China
13
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Plasma Chemistry and Plasma Processing
the detonation combustion cycle has higher combustion efficiency [1], higher propulsion performance [2], and has the advantage of compact structure [3]. Compared with the traditional turbine engine combustion chamber structure, the annular combustion chamber structure is simpler [4], making it more suitable for use in existing aviation jet turbine engines. In terms of propulsion performance, the specific fuel consumption rate in RDC is about 30% lower than that of a traditional afterburner, while the unit thrust is at least 30% higher than that of a traditional afterburner [5]. At pres
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