The hostile conditions encountered in flames makes it difficult to obtain measurements by conventional techniques. This work describes attempts to obtain time-resolved fluid mechanical information in jet diffusion flames using laser-optical techniques. Several different instruments were used in this study. Laser Doppler anemometry, using a tracking filter processor, was developed for measurement of the time varying velocity structure of these flames. The limitations and applicability of such a technique are investigated. Measurements of various statistical quantities, such as rms intensities and power spectra, are presented. A quantitative Schlieren technique was used to obtain information of flow structure over a wider range of experimental conditions than was possible using the LDA. This provided an insight into the larger scale processes within the flame. A hybrid correlation technique using both Schlieren and LDA was developed. This was used to investigate the near field of both jets and flames. The experiments show that significant differences in structure exist between isothermal and combusting flows. This manifested itself in several ways, including changes in vortex structure and a well defined low frequency instability of the flame.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:448766 |
| Date | January 1975 |
| Creators | Ballantyne, Alexander |
| Contributors | Bray, K. N. C. |
| Publisher | University of Southampton |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | https://eprints.soton.ac.uk/52363/ |
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