Tesis doctoral de Pierre Boivin
Reduced chemical-kinetic mechanism are investigated for hydrogen and syngas combustion to fill the need for simplified chemistry able to describe with accuracy both premixed and diffusion flames and also autoignition, necessitated for instance in computational work that addresses turbulent combustion or the transition from deflagration to detonation. The reduced descriptions incorporate steady-state assumptions for o and oh, which are found to be reasonably accurate for flames but much less accurate for autoignition. A detailed description of ignition histories, both above and below the second explosion limit, provides explicit analytic expressions for the ignition time of hydrogen-air mixtures, valid in a wide range of pressure, temperature, and equivalence ratios, and also leads to a correction for the rates of the reduced chemistry that improves accuracy of predicted ignition times while keeping the simplification associated with the steady-state assumptions for o and oh. The resulting reduced mechanisms, which consist of three overall steps for hydrogen combustion and one additional co-oxidation step for syngas combustion, possess reasonable accuracy for most computational purposes, as it is demonstrated through extensive validation exercises including comparisons with detailed-chemistry computations and experimental measurements of flame-propagation velocities, extinction strain rates, and ignition times. The three-step mechanism is used also to investigate a turbulent, supersonic, autoignition-stabilized, hydrogen-air lifted flame, enabling reduced-chemistry capabilities to be tested in a large scale simulation including turbulence modelling.
Datos académicos de la tesis doctoral «Reduced-kinetic mechanisms for hydrogen and syngas combustion including autoignition«
- Título de la tesis: Reduced-kinetic mechanisms for hydrogen and syngas combustion including autoignition
- Autor: Pierre Boivin
- Universidad: Carlos III de Madrid
- Fecha de lectura de la tesis: 15/12/2011
Dirección y tribunal
- Director de la tesis
- Antonio Luis Sánchez Pérez
- Tribunal
- Presidente del tribunal: forman arthur Williams
- bénédicte Cuenot (vocal)
- amable Liñán Martinez (vocal)
- paul Clavin (vocal)