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A mathematical model of a lean-premixed combustor was developed to determine NOx emissions based on easily measured parameters. These parameters can include ambient pressure/temperature, specific humidity, compressor discharge pressure/temperature, gas generator turbine inlet temperature, and air/fuel mass flow rate. All parameters of interest were modifiable within the model so their effects on NOx production could be studied. The combustor was modeled as several one-dimensional well-stirred gas zones. One-dimensional heat conduction was considered through the combustor wall, with convection on the inside and outside due to the combustion gases and cooling air respectively. Radiation heat transfer between the combustion gases and the combustor wall was also considered using Hottel's zone method. A four-gray gas model was used to handle the nongray characteristics of the combustion gases and treat them as a radiatively participating medium. NOx production was modeled using the extended Zeldovich mechanism along with the N2O-intermediate mechanism, which is important in lean-premixed combustion systems. The resulting determination of NOx production was used to develop relationships between the input parameters and NOx production. In addition, NOx emission and operating parameter data was collected on gas turbines operating in the field. This data was used to determine the values of tunable constants that must be inserted into the NOx relationship for individual gas turbines.
Your Price $195.00
List Price $195.00