Projects
Projects: Projects for Investigator |
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| Reference Number | EP/D001579/1 | |
| Title | Particle Image Velocimetry Measurements for Thermo-Acoustic Instability Research | |
| Status | Completed | |
| Energy Categories | Fossil Fuels: Oil Gas and Coal(Oil and Gas, Oil and gas combustion) 100%; | |
| Research Types | Basic and strategic applied research 100% | |
| Science and Technology Fields | ENGINEERING AND TECHNOLOGY (Mechanical, Aeronautical and Manufacturing Engineering) 100% | |
| UKERC Cross Cutting Characterisation | Not Cross-cutting 100% | |
| Principal Investigator |
Professor C Lawn No email address given Engineering and Materials Science Queen Mary, University of London |
|
| Award Type | Standard | |
| Funding Source | EPSRC | |
| Start Date | 01 October 2005 | |
| End Date | 30 September 2007 | |
| Duration | 24 months | |
| Total Grant Value | £144,355 | |
| Industrial Sectors | Aerospace; Defence and Marine | |
| Region | London | |
| Programme | Process Environment and Sustainability | |
| Investigators | Principal Investigator | Professor C Lawn , Engineering and Materials Science, Queen Mary, University of London (100.000%) |
| Web Site | ||
| Objectives | ||
| Abstract | Utilisation of natural gas for power generation has involved the installation of a large number of so-called 'industrial' (i.e land-based) gas turbines. In an effort to reduce the emission of nitrogen oxides, all manufacturers of these machines have designed them to operate under fuel lean conditions, thus reducing the peak combustion temperatures at which nitrogen oxides are formed. This has led to a major problem, the onset of combustion fluctuations, whereby the flame feeds energy into acoustic waves to generate 'self-excited thermo-acoustic instabilities'. The vibrations of critical components induced by this noise can be so strong as to limit operation, and this problem has been the subject of a major research effort over the last decade.While the frequency at which these oscillations are likely to occur is well understood, the mechanisms by which their amplitude is limited is not. At low amplitude, a linear relationship between the incident acoustic velocityand the heat release from the flame is an adequate description, but as the amplitude increases, non-linearities usually limit it so as to produce stable oscillations. This research will investigate the mechanisms for non-linear response by making detailed measurements of flame movement and incident velocity on small-scale burners in the laboratory. An analytical model will then be developed to describe the non-linear behaviour, and this will be used in an existing acoustic model to calculatethe amplitudes under different acoustic conditions. Application of these methods to full-scale flames will guide the design of burners so that they are less susceptible to the thermo-acoustic instability problem | |
| Publications | (none) |
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| Final Report | (none) |
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| Added to Database | 01/01/07 | |
