Numerical investigation of the effect of inlet mass flow rates on H2/air non-premixed rotating detonation wave. (19th July 2018)

• Record Type: Journal Article
• Authors: Meng, Qingyang; Zhao, Ningbo; Zheng, Hongtao; Yang, Jialong; Qi, Lei
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 29(2018)
• Page Start: 13618
• Page End: 13631
• Publication Date: 2018-07-19
• Subjects: Rotating detonation wave -- Numerical investigation -- Mass flow rate -- Stability -- Propagation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.05.115
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this paper, a three dimensional numerical investigation was carried out to study the formation and propagation characteristics of non-premixed rotating detonation wave using H2 /air as reactive mixtures. At a constant global equivalence ratio, the effects of inlet mass flow rates of H2 and air on various performance parameters of rotating detonation wave and based on it combustor were analyzed in detail. On this basis, the mode switching process of rotating detonation wave caused by transiently changing the inlet mass flow rates was also discussed. The numerical results showed that inlet mass flow rates of H2 and air played a very critical role in the formation, propagation and mode switching of rotating detonation wave. With the increase of inlet mass flow rates, rotating detonation wave could be switched from single wave to double waves. The propagation direction of double waves depended on the changing process of inlet mass flow rates. Meanwhile, compared to the single wave, double waves or its based combustor had the obvious advantages in formation time, stability and thrust, but had disadvantage in pressure ratio. In addition, both fill characteristics and mixing quality of fresh reactive mixtures are the underlying important mechanisms to explain the effects of inlet mass flow rates on rotating detonation waves. Highlights: Effects of mass flow rates on the formation and propagation of RDW are studied numerically. The characteristics and mechanisms of single and double RDW are discussed. RDW can be switched from single wave to double waves by increasing mass flow rates. Double RDWs have advantages in formation time, propagation stability and thrust.