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Blowoff propensity, CRZs and flow turbulent nature using various syngases for gas turbines

Baej, Hesham, Valera Medina, Agustin, Syred, Nicholas, Marsh, Richard and Bowen, Philip John 2015. Blowoff propensity, CRZs and flow turbulent nature using various syngases for gas turbines. Presented at: The 3rd Sustainable Thermal Energy Management International Conference (SUSTEM 2015), Newcastle upon Tyne, UK, 7-8 July 2015. pp. 2307-2312.

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Abstract

This paper presents a series of experiments and numerical simulations using commercial software (ANSYS) to determine the behaviour and impact on the blowoff process with various geometries and simulated syngas compositions at fixed power outputs. Experiments were performed using a generic premixed swirl burner. The Central Recirculation Zone and the associated turbulent structure contained within it were obtained through CFD analyses providing details of the structures and the Damkolher Number (Da) close to blowoff limits. The results show how the strength and size of the recirculation zone are highly influenced by the blend, with a shift of Da and turbulence based on carbon-hydrogen ratio, shearing flows and Reynolds number. Instabilities such as thermoacoustics, flashback, autoignition and blowoff are highly affected by the flow structures and chemical reactions/diffusivity. Moreover, it has been observed that turbulence close to the boundaries of the central recirculation zone, a region of high stability for swirling flows, is highly altered by the chemical characteristics of the fuel blends. In terms of blowoff, the phenomenon is still not entirely understood. As the process occurs, its theoretical limits do not match its real behaviour. Therefore, one possibility could be the difference in turbulence and Da numbers across the flame, being critical at the base of the flame where the system is stabilized.

Item Type: Conference or Workshop Item (Paper)
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Last Modified: 20 Sep 2018 21:06
URI: http://orca.cf.ac.uk/id/eprint/71654

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