At the ASME Turbo Expo 2018 conference held in Oslo (Norway) on the 11th-15th of June 2018, the paper GT2018-75419 «Experience of Low-Emission Combustion of Aviation And Bio Fuels In Individual Flames After Front Mini-Modules of a Combustion Chamber» was published. Its main idea is that some basic principles of liquid fuel lean combustion were incorporated into a design of a front module with a staged pneumatic fuel spray. Computational investigations of the module showed that the use of the module in a combustor with multi-atomizer dome allows to reach the required values of emission parameters planned for 2030 standards. After that the module was manufactured and tested. The analysis of the generated aerosol revealed the high uniformity of the fuel distribution in the spray cross-section and low droplet size dispersion. The obtained characteristics proved high quality of air-fuel mixture. So it was decided to carry out preliminary tests in a 3-burner sector of a combustor. The tests verified the calculated emission characteristics within the narrow range of fuel-air ratio: fuel combustion efficiency is higher than 99.5%, EiNOx is at the level of 1 g/fuel kg. Such optimistic results proved the necessity to continue the studies of the low-emission combustion of liquid fuel. This paper presents a description of detailed (numerical and experimental) studies of the front module with a staged pneumatic fuel spray. The calculations of the combustor sector with 3 front modules were conducted. The impact of turbulence models on NO emission was investigated. The experimental research was carried out in two directions: 1) probing of the chamber of the 3-burner sector flame tube at the distance of one third of its length (temperature field and gas sampling); 2) investigation of the model combustor with actual arrangement of the modules in the dome within a wide range of fuel-air ratio. The calculation and experimental data for the 3-burner sector were compared. New data about flame structure in the experimental sector on the whole correspond to the calculated curves. The maximum error for the calculated values of NO was obtained with the approaching of the mixture to the stoichiometric composition. The experimental data confirm the results of preliminary studies of the 3-burner sector of the combustor: combustion efficiency is higher than 99.5%, EiNOx is at the level of 1-2g/fuel kg at the combustor inlet air temperature of 680K and fuel-air ratio of 0.0225. The conducted research allowed to receive additional information on the influence of some design units on the pollutant emission and to estimate the different elements of computational methods for simulation of a low-emission combustor with a multi-atomizer dome.


Detailed Study of Front Module for Low-Emission Combustor

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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