| OCR Text |
Show This performance index, applied to [NOx] and llc measurements taken across the stability limits of one particular nozzle configuration at 100% load, is plotted in Figure 3. The region of optimum performance (maximwn J) is indicated by the white band in Figure 3. ~ ~ .~ ~ en en Q) U >( UJ Perf. Index, J 0.3 0.78+ 0.73 to 0.78 0.68 to 0.73 0.25 0.64 to 0.68 0.59 to 0.64 0.2 0.54 to 0.59 0.49 to 0.54 0.44 to 0.49 0.15 0.39 to 0.44 0.35 to 0.39 0.1 0.30 to 0.35 0.25 to 0.30 0.05 o 0.41 0.44 0.47 0.5 0.53 0.56 0.59 0.62 Swirl Intensity , s' Figure 3. Performance Index, J, as a function of EA and S', White region indicates area of best perfonnance. Proof-of-Concept. As a demonstration of the viability of the active control approach, a relatively simple problem was considered: Optimize the perfonnance of the burner for a given geometry, at a static load (100%), using a relatively simple and well-understood search algorithm. That is, determine if the active control system can find the optimum of the surface shown in Figure 3, without having knowledge of the shape of that surface, other than the location of the stability limits. The burner geometry incorporates a nozzle that injects the fuel in the same sense as the flow of the swirling air (co-swirl). This problem was presented in a previous work [St. John and Samuelsen, 1994] and is summarized here for completeness. 5 |
