| OCR Text |
Show where ro = radius to tangential swirl inlet R = throat radius At = total area of tangential swirl inlets mq, = tangential air mass flow rate rna = axial air mass flow rate For the large burner results, swirl is represented as Sy/(1t ro RlAt} such that a value of 1.0 represents all tangential air. The furnace enclosure for the 100,000 Btu/hr burner consists of an octagonal aluminum frame three feet in height and 24 inches across. Each side of the enclosure is divided into an upper and lower section; the upper section houses a 18 x 9.5 x 1/8 inch piece of aluminum while the lower section can house a similar sized piece of heat resistant glass or aluminum, depending on the desired amount of optical access. With the glass panels installed, the enclosure allows for maximum optical access for flow visualization and future laser diagnostic probing while maintaining approximate cylindrical synunetry; this design was modeled after the optical access furnace at the SNLL (Edwards, 1988). For the 100,000 Btu/hr burner, aluminum pieces were initially used for all but one panel such that the temperature on the walls for all burner conditions could be evaluated prior to ordering the glass panels (i.e., Pyrex versus Vycor windows). The furnace exit consists of a stainless steel octagonal contraction and a 36 inch "stack" which exhausts into a larger hood. Emissions measurements are taken at the exit of the stack to ensure uniform flow and emissions concentrations. The emissions sample is taken through an ice bath prior to delivery to the analyzers to preclude water condensation inside the emissions instruments. The same emissions instruments are used as in the 50,000 Btu/hr burner studies. Figure 3 shows the placement of the emissions instruments for the large burner. BURNER TRAVERSE Figure 3: 100,000 Btu/hr Burner Sampling Location and Analyzers 5 |
