V.Ganesan. Indian Institute of Technology, Madras, India. ABSTRACT. Accurate simulation of flow and combustion in a gas turbine afterburner is essential for.
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G PREDICTION OF MODEL GAS TURBINE AFTERBURNER PERFORMANCE USING CFD S.Ganesan, S.Kishore Kumar, Venkataraman Shankar Gas Turbine Research Establishment. Bangalore, India
Email: ganesan@ mail. gtre. org V.Ganesan Indian Institute ofTechnology, Madras, India ABSTRACT Accurate simulation of flow and combustion in a gas turbine afterburner is essential for designing and developing a modern gas turbine engine. This paper describes a three dimensional numerical investigation of the flow inside a model gas turbine afterburner. The afterburner is typical of current high performance v-gutter type afterburner without internal cooling liner. The model is first studied under low speed non-reacting conditions. The analysis is carried out with several variants of turbulence models and found that the results of the quadratic non-linear k-H turbulence model matched closely with experimental data. The analysis is extended to high speed flow which is common in practical afterburners to investigate the effect of pressure, temperature and swirl angle. Each of the parameters had a marked effect on afterburner performance within the range of conditions investigated.
NOMENCLATURE D = Diameter of the afterburner X = Axial co-ordinates
INTRODUCTION A gas turbine afterburner is required to operate under severe conditions of pressure and temperature to meet the design requirements of next generation gas turbine engines. This fact, coupled with the current trends towards higher turbine discharge temperature and the requirement for satisfactory operation over extended fuel/air ratios and flight maps call for greater understanding of the internal aerodynamics for improving total pressure loss, combustion efficiency and thrust developed by the afterburner. This paper presents a detailed CFD analysis of non-reacting and reacting flow in a model gas turbine afterburner system. This afterburner is typical of current high performance v-gutter type afterburner. The computed velocity field is compared with experimental measurements under low speed nonreacting conditions. The analysis is extended to high speed flow under non-reacting and reacting conditions to investigate the individual effects of afterburner inlet total temperature, total pressure, swirl angle, velocity, and combustion chamber length.
