Influence of water microdroplets on hydrogen–air flame instability development in a channel

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Abstract

The paper is devoted to the numerical analysis of the gaseous combustion process in a channel willed with the hydrogen-air mixture with the inflow of a fresh mixture seeded with microdroplets of water. The dynamics of microdroplets are described in the Lagrangian approximation, which makes it possible to identify the role of local interaction between the droplets and the flame front. It has been shown that the impact of droplets on the front can provoke the generation of disturbances of the flame front and intensify the development of front instability, thereby causing an integral increase in the combustion rate. Using spectral analysis of the structure of the front in the presence of microdroplets, the dynamics of the development of individual harmonics of front disturbances was analyzed and the mechanisms of evolution of the flame front under the influence of microdroplets of water were identified.

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About the authors

I. S. Yakovenko

Joint institute for high temperatures of the Russian Academy of Sciences

Author for correspondence.
Email: yakovenko.ivan@bk.ru
Russian Federation, Moscow

A. D. Kiverin

Joint institute for high temperatures of the Russian Academy of Sciences

Email: yakovenko.ivan@bk.ru
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Statement of the problem of flame propagation in an open channel with the supply of a fresh mixture with an admixture of suspended microdroplets of water: the dashed line is the initial disturbance, the dash-dotted line is the axis of symmetry.

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3. Fig. 2. Dispersion curve of the flame front instability of a mixture of 15% hydrogen with air.

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4. Fig. 3. Dynamics of flame front structure development in a pure gas mixture of 15% hydrogen with air and in the presence of water microdroplets: a – combustion without water droplets; b – combustion with water droplets supplied to the combustion zone at hd = 2 mm, 3 mm (c) and 4 mm (d). Solid black lines are temperature isolines T = 1000 K, dashed red lines are the initial disturbance, and dash-dotted black lines are microdroplet trajectories. The time between individual isolines is Δt = 1 ms.

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5. Fig. 4. Time dependences of the flame front harmonic amplitude An(t) for the initial disturbance n = 1 (a) and the harmonic with a wavelength equal to the channel width n = 1 (b). Solid black lines – pure gas mixture without droplets, dashed-dotted green lines – hd = 4 mm, solid red lines – hd = 3 mm, dashed blue lines – hd = 2 mm.

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6. Fig. 5. a – Dependence of the flame front perimeter values, Pf, normalized to the channel width, on time. b – Time dependence of the velocity of the average coordinate of the flame front in the laboratory reference system, ufL, normalized to the value of the normal combustion velocity Sb. The designations are the same as for Fig. 4.

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