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Show sampling probes for the gas composition field, microthermocouple probes for the the temperature field, and two-component laser velocimetry (LDV) for the velocity field. These measurements are very important, as well, to support and validate mathematical modelling, item 4, on which work has also begun. The practical objective of mathematical modelling is, of course, to provide comprehensive and reliable guidance on all important questions of burner design and performance. Quite clearly, the the modelling problems posed by the C G R I burner are somewhat different from those of most burners. In particular, the following aspects pose special challenges: 1. The treatment of reaction in the fuel jets up to confluence with the air jets. Here fuel reacts with recirculating combustion products that are being entrained and which contain oxygen at the level provided by the excess air. The "reburning" of N O x is likely to be a conspicuous feature in this very fuel-rich region. 2. The treatment of reaction in the main combustion field which is fed with the peculiar mix of full and partial combustion products from the fuel jets and a mixture of air and largely full combustion products from the air jets. While significant problems remain as enticements for further research, the work to date is sufficient to define the configuration and performance of a practically viable product. Accordingly, as noted earlier, patents have been applied for, beginning with Besick, et al. (1995). The additional research will have the function of strengthening, to the extent that is reasonably possible and profitable, the scientific support for the application of the burner. It should also, because of the special features of mixing and reaction that are that are emphasized in the C G RI burner flame, to the point of exaggeration, result in generally interesting contributions to combustion science. Acknowledgements This research was specifically occasioned by a contract from the Canadian Gas Research Institute (CGRI) and was supported jointly by that contract and by a contract co-funded by Natural Resources Canada ( C A N M E T Division) and British Gas pic. The work was also aided by grants to one of us (Becker) from the Natural Sciences and Engineering Research Council of Canada and British Gas pic. Notation Subscripts (partial list) 1 a property of the fuel at a burner-port exit 2 a property of the air at a burner-port exit j either of the above:/ = 1 or 2 25 |