Combustion in Advanced Gas Turbine Systems. Proceedings of by I. E. Smith

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Extra info for Combustion in Advanced Gas Turbine Systems. Proceedings of an International Propulsion Symposium Held at the College of Aeronautics, Cranfield, April 1967

Example text

Thus there is generally no easy correlation between primary and exhaust smoke and steps taken to reduce the quantity of exhaust smoke may have little or no effect on primary zone carbon. The latter manifests itself as deposits on the burner faces and flares (or other low temperature surfaces) and as increased flame luminosity giving rise to higher wall temperatures. The effects of burner car boning will be discussed in a later section. Detailed analyses of the mechanisms of smoke formation and of its quantitative measurement have been made elsewhere by other authors and, therefore, in this section we can restrict ourselves to a description of the develop­ ment process which achieved a satisfactory smoke level reduction on this partic­ ular chamber.

TIPLER H E = Heat e x c h a n g e r o t h e r symbols a s in figure II Compression ratio FIG. 1 2 . Thermal efficiency of high temperature gas turbine with intermediate high temperature heat exchanger. (Fig. 11). The exhaust gas temperature is greater than 900°C throughout the range considered. Deposit thickness on the turbine blading should therefore be kept within reasonable limits. The function of the intermediate heat exchanger is to cool the exhaust gases from turbine Τγ to 480°C for admission to the uncooled turbine T2.

And thus a higher flame temperature, causes more rapid evaporation of the fuel droplets the vapour having still further reduced penetration. (b) The adoption of the microcage burner for reasons of consistency men­ tioned earlier with the deflection of a proportion of the pilot fuel spray towards the centre of the flame tube—the region to which the secondary air has the greatest diflSculty in penetrating. Thus, against this background of a rich central zone, the extra wigglestrip standard of flame tube, with its reduced pressure loss and hence less penetration of external air towards the chamber axis through the secondary and dilution holes, inevitably produced higher smoke levels than the initial standard of chamber.

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