Li, Jiale;
(2024)
Numerical investigation of hydrogen-air mixing in
jet-in-crossflow configuration for future low-emission gas turbines.
Masters thesis (M.Phil), UCL (University College London).
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Abstract
Understanding the mixing and reaction of hydrogen-air is of both fundamental and practical importance for the design of near-future hydrogen-powered zero-carbon combustors. Due to the intense burning characteristics of hydrogen being much different from conventional energy sources, redesigning hydrogen combustors for small-scale energy systems such as gas turbine, vehicles, and the aeroplane is required. Computational Fluid Dynamics (CFD) has appeared as a thought-provoking and practical method for simulating turbulent mixing and hydrogen flames. Under the Reynolds- Average Navier-Stokes (RANS) frame, the hydrogen-air premixing and hydrogen flames are performed by CFD simulations with details. This work includes two potential types of hydrogen combustors: Lean-Direct-Injection (LDI) configuration and Hydrogen Jet Burner. For both studies, the non-reacting premixing is studied prior to reacting flows, as this premixing dictates the mixture profile and subsequently influences the progress of the combustion reactions. This thesis explores the different hydrogen-air mixing configurations and a few reacting chamber designs for both combustors. The study on LDI investigates the trajectories and the mixing performance of single and multiple round injections at different jet-to-crossflow momentum flux ratios (J). Following the non-reacting flow studies, a reacting study within the combustor developed by mixing simulations was carried out. For hydrogen jet burner studies, the analyses of the gaseous hydrogen jets injected into the air stream and premixing in a tube for different fuel injection designs are included. Some reacting cases in three selected configurations were proposed to understand the effects of the combustion chamber on flame shape and stabilisation. Future possible works to further extend these two cases are suggested and discussed at the end of this study.
| Type: | Thesis (Masters) |
|---|---|
| Qualification: | M.Phil |
| Title: | Numerical investigation of hydrogen-air mixing in jet-in-crossflow configuration for future low-emission gas turbines |
| Language: | English |
| Additional information: | Copyright © The Author 2024. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10192430 |
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