A Study of Ion Concentration Fluctuations in Turbulent Diffusion Flames using Correlation Techniques


An investigation of the interaction between chemistry and turbulence has been made by studying the effects of non equilibrium ion chemical kinetics in a turbulent diffusion flame. In such a system the charged species undergo a chemical reaction concurrently with turbulent mixing. Where the chemical reaction rate is greater than the appropriate mixing rate it has been theoretically predicted that a measurable difference should exist between the statistical functions used to describe the fluctuating species concentration field and that of a chemically inert constituent. Experimental evidence for this phenomenon has been established by sampling the local ion concentration fluctuations in a turbulent diffusion flame, of nozzle Reynolds number 1.0 x 10 *4 using a stationary electrostatic probe. The random positive ion saturation current collected by the probe was analysed to determine its auto correlation function. The ionisation field was generated by seeding the flame with acetylene and other metal salt solutions preselected on the basis of their Damkohler number values in the flame. Studies have also been conducted to map the flame determining both autocorrelation and cross correlation functions to obtain further information for the interaction phenomenon and of the structure of the ion concentration field throughout the flame.

Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: Copyright © Roberts, 1973. W.G. Roberts asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately
Institution: Aston University
Uncontrolled Keywords: Ion concentration,fluctuations,turbulent diffusion flames,correlation techniques
Last Modified: 08 Dec 2023 08:03
Date Deposited: 11 Jan 2011 13:52
Completed Date: 1973
Authors: Roberts, William G.

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