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arrangement had not been tested so that the accuracy of the model could not be readily determined. However, measured CO levels were available for an older nozzle with different arrangement that also featured eight-vane injector elements. In the staged-injection concept used to reduce CO emissions at part-power operating conditions, the fuel was injected into three essentially concentric zones that were designated the inner, middle and outer zones. The swirler characteristics and nozzle ACD values varied from zone to zone. Generally, the equivalence ratio of the middle zone was reduced and that of the other zones was increased so as to maintain a constant overall equivalence ratio. The CFD cases were run for the 70-percent power condition. Detailed CFD results were obtained for a representative nozzle element for each stage; the results were then interpolated to a nozzle for use in the reacting-flow simulations. An example is shown in Figure 2.2.7, with the flow vectors at the nozzle colored by fuel-air ratio. Figure 2.2.7 Representative nozzle boundary condition Predicted CO results are shown in Figure 2.2.8 for the nozzle operated with both OD injection (Series 300) and ID injection (Series 500). In addition, results for the older nozzle for which data are available for the nominal fuel-air distribution (Series 400) are included; note that Series 400 results were obtained at a somewhat different operating condition corresponding to an actual test condition. The abscissa indicates the equivalence ratio of the middle zone relative to that at the nominal (design) condition. Values higher than 100 percent imply that the inner and outer zone equivalence ratios are reduced so that the overall fuel-flow rate is constant. The values shown in Figure 2.2.8 were computed at the exit of the combustor and did not include the effects of CO reduction due to further oxidation because of increased residence time in the transition duct and because of downstream air addition. 53PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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