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Numerical Simulation of Transient Development of Flame, Temperature and Velocity under Reduced Gravity in a Methane Air Diffusion Flame

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Abstract

A methane air co flow diffusion flame has been numerically simulated with the help of an in-house developed code at normal gravity, 0.5 G, and 0.0001 G (microgravity) for the study of transient behavior of the flame in terms of flame shape, temperature profile and velocity (streamlines). The study indicates that lower is the gravity level, the higher is the time of early transience. The flame developments during transience are marked by the formation of a secondary flamelet at different heights above the primary flame at all gravity levels. The development of temperature profile at microgravity takes a much longer time to stabilize than the flame development. At normal gravity and 0.5 G gravity level, streamlines, during transience, show intermediate vortices which are finally replaced by recirculation of ambient air from the exit plane. At microgravity, neither any vortex nor any recirculation at any stage is observed. Centerline temperature plots, at all gravity levels during transience, demonstrate a secondary peak at some instants as a consequence of the secondary flamelet formation. The centerline velocity at microgravity decreases gradually during transience, unlike at other two gravity levels where the fall is very sharp and is indicative of negligible buoyancy at microgravity.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Heritage Institute of Technology, East Kolkata, West Bengal, India

    Arup Jyoti Bhowal

  2. Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, India

    Bijan Kumar Mandal

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  1. Arup Jyoti Bhowal
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  2. Bijan Kumar Mandal
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Correspondence to Arup Jyoti Bhowal.

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Bhowal, A.J., Mandal, B.K. Numerical Simulation of Transient Development of Flame, Temperature and Velocity under Reduced Gravity in a Methane Air Diffusion Flame. Microgravity Sci. Technol. 29, 151–175 (2017). https://doi.org/10.1007/s12217-016-9535-4

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  • DOI: https://doi.org/10.1007/s12217-016-9535-4

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