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Open AccessArticle

Numerical Investigation of Mixing Characteristic for CH4/Air in Rotating Detonation Combustor

College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
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Appl. Sci. 2020, 10(4), 1298; https://doi.org/10.3390/app10041298
Received: 25 December 2019 / Revised: 11 February 2020 / Accepted: 12 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Computational Fluid Mechanics and Heat Transfer)
The mixing process of fuel and oxidizer is a very critical factor affecting the real operating performance of non-premixed rotating detonation combustor. In this paper, a two-dimensional numerical study is carried out to investigate the flow and mixing characteristics of CH4/air in combustor with different injection structures. On this basis, the effect of CH4/air mixing on the critical ignition energy for forming detonation is theoretically analyzed in detail. The numerical results indicate that injection strategies of CH4 and air can obviously affect the flow filed characteristic, pressure loss, mixing uniformity and local equivalence ratio in combustor, which further affect the critical ignition energy for forming detonation. In the study for three different mass flow rates (the mass flow rates of air are 12.01 kg/s,8.58 kg/s and 1.72 kg/s, respectively), when air is radially injected into combustor (fuel/air are injected perpendicular to each other), although the mixing quality of CH4 and air is improved, the total pressure loss is also increased. In addition, the comparative analysis also shows that the increase of mass flow rate of CH4/air can decrease the difference of the critical ignition energy for forming detonation at a constant total equivalence ratio. The ignition energy decreases with the decrease of the total flow rate and then increases gradually. View Full-Text
Keywords: rotating detonation; numerical simulation; mixing characteristic; equivalence ratio; flow filed characteristic rotating detonation; numerical simulation; mixing characteristic; equivalence ratio; flow filed characteristic
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MDPI and ACS Style

Jin, S.; Meng, Q.; Li, Z.; Zhao, N.; Zheng, H.; Yang, J. Numerical Investigation of Mixing Characteristic for CH4/Air in Rotating Detonation Combustor. Appl. Sci. 2020, 10, 1298.

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