| OCR Text |
Show PMT OH Line Collimating ^g Filter Lens T L i n e - Filter Fiber Input Figure 2: Optical Layout Injector ' TiD ^p Fuel _*- Line /?; < Fiber -*" I » Figure 3: Fiber Optic Location The chemiluminescence data were collected at a sampling rate of 5,000 H z at a bit resolution of 16,384. This was done to capture the fluctuating component of the time series data. The data were acquired and processed using LabView programming software. Six runs of data (6x16,384) were processed to arrive at the average and fluctuating values per condition; this number of runs was selected based on (1) initial measurements of repeatability, (2) computer processor capability, and (3) experimental expedience. RESULTS N O , and C O emissions maps for the two different injectors are shown in Figure 4 in terms of swirl intensity (S*) and excess air. The different emissions characteristics are known from previous studies, with the co-swirl injector displaying low N O x but much higher C O emissions. These two sets of emissions maps provide a good example of the N O . - C O trade-off inherent in combustion systems. Chemiluminescence measurements of O H , C H , and C 0 2 were taken concurrently with the emissions data. In order to illustrate the magnitudes of the emissions, scatter plots are shown in Figure 5 with the O H , C H , and C 0 2 emissions at lO^c excess air for both the co-swirl and counter-swirl injectors. |
