...Igor Fuksman; Steven Sirica In the past, a typical way of executing simulations in a real-time environment had been to use transfer function models, state-variable models, or reduced-order aero-thermodynamic models. These models are typically not as accurate as the conventional full-fidelity aero...

...Luis Tay-Wo-Chong; Sebastian Bomberg; Ahtsham Ulhaq; Thomas Komarek; Wolfgang Polifke The flame transfer function (FTF) of a premixed swirl burner was identified from a time series generated with computational fluid dynamics simulations of compressible, turbulent, reacting flow at nonadiabatic...

... to auto switching, and adequate filter design for the inclusion of derivative action. Controller gain tuning is accomplished by Skogestad’s internal model control tuning rules derived from empirical first order plus delay time transfer function models of the hybrid facility. Avoidance of strong input...

... ) is fixed at 5% to ensure linear flame response over the employed modulation frequency range. The measurements are used to calculate a flame transfer function relating the velocity fluctuation to the heat release fluctuation as a function of the velocity fluctuation frequency. At low frequency, the gain...

... precession frequency. A solution is developed for the reaction-force components for a range of precession frequencies, producing frequency-dependent stiffness and damping coefficients. They can be used to define a Laplace-domain transfer-function model for the reaction-force/rotor-motion components...

...Bruno Schuermans; Felix Guethe; Douglas Pennell; Daniel Guyot; Christian Oliver Paschereit Thermoacoustic transfer functions of a full-scale gas turbine burner operating under full engine pressure have been measured. The excitation of the high-pressure test facility was done using a siren...

... and support structure. Two approaches are presented, including development of transfer functions of the casing and foundation, as well as a fully coupled rotor-casing-foundation model. The effect of bearing support compliance is captured, as well as the influence of casing modes on the rotor response...

... aerodynamics combustion combustion equipment confined flow flames jets swirling flow transfer functions The stability of lean premixed combustion systems with regard to self-sustained combustion instabilities can be evaluated with a stability analysis using the acoustic network modeling approach...

...Daesik Kim; Jong Guen Lee; Bryan D. Quay; Domenic A. Santavicca; Kwanwoo Kim; Shiva Srinivasan The flame transfer function in a premixed gas turbine combustor is experimentally determined. The fuel (natural gas) is premixed with air upstream of a choked inlet to the combustor. Therefore, the input...

... network model for nonlinear thermoacoustic oscillations an initial frequency-domain calculation is performed. The linear network model, LOTAN, is used to categorize the combustor geometry by finding the transfer function for the response of flow perturbations (at the fuel injectors, say) to heat-release...

... functions This paper describes an experimental investigation of the flame transfer function between flow disturbances and heat release oscillations in a lean, premixed combustor. This research effort is motivated by the fact that modern gas turbines, operating fuel lean to minimize exhaust emissions...

... through understanding the transfer function, which represents the relationship between the unsteadiness of combustion and the inlet fuel and air. In the present work, various types of signals are applied to produce a small change in the inlet fuel and air flow rates, the response in the rate of heat...

... to the SFDs, and measurements of the transient rotor response to calibrated impact loads are conducted. System damping coefficients, identified from acceleration/load transfer functions, decrease steadily as the air content in the mixture increases. However, measurements of the rotor synchronous imbalance...

... model of the motor test rig. The dynamic model is validated against experimentally measured transfer functions with good agreement between the two. Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL...