Probe Effects in Gas Turbine Combustor Emissions Measurements
Technical Report,01 Mar 1978,01 Oct 1978
DAYTON UNIV OH DAYTON United States
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Four geometrically distinct, stainless steel probes are used to study the concentrations of CO, HC,, NO, and NOX at several different radial and two different axial positions within a simplified gas turbine combustor. The probes are all water cooled but do not employ an aerodynamic quench. They are designed to assess the effect of tip shape, tip to body proximity, and probe entry point on measured pollutant concentrations. Though probe entry point and tip to body proximity are shown to imperceptibly affect the pollutant concentrations, probe tip geometry has a marked impact on the measured pollutant levels. Specifically, the aerodynamic, tapered-tip probe yields depressed CO and HC, and elevated NO concentrations compared to other three blunt-tipped probes. Regarding reproducibility, the pollutant concentrations measured with one of the blunt-tipped probes in this study are compared to pollutant levels measured with the same probe three years ago Tuttle, et al. 1975. CO and HC are shown to be the most reproducible species, while NO and NOX acceptably but less accurately agree with past studies.