Numerical and analytical study of combustion instabilities in industrial gas turbine Author Dmytro Iurashev Supervisor: Giovanni Campa Federico Daccà Alessandro Bottaro Genova 15 - 09 - 2015

Outline Introduction BRS (TUM) test rig results Gioia del Colle (Ansaldo Energia) test rig challenges Montestigliano inspiration Conclusions & Future investigations Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Numerical and Analytical Study of Combustion Instabilities in Industrial Gas Turbine Limit cycle. Prediction of the amplitude of pressure perturbations Simulations in time domain The main aim: To develop a simplified fast and precise tool able to predict combustion instabilities in industrial gas turbine burners Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

BRS* test rig Normalized intensity of Heat release * Beschaufelter RingSpalt Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Flame Transfer Function using FSC model (Sct = 0.3, CD = 0.3, Umean = 18 m/s) Advanced methods of calculations: The Wiener filter, Multi-Sine analysis Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Gioia del Colle test rig Atmospheric test rig Thermal power: 1.85 MW Round combustion chamber D = 550 mm Variable length of combustion chamber Mean methane/air equivalence ratio of 0.47 FTF can be obtained perturbing velocity at the inlet or equivalence ratio at injection point Boundary condition Type Inlet Non-reflective Velocity inlet Outlet Pressure outlet Walls Adiabatic no-slip wall Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Gioia del Colle test rig vs BRS challenges Gioia del Colle test rig vs BRS advantages Adiabatic combustor walls – no problems with heat release distribution as in BRS Gioia del Colle test rig vs BRS challenges Partially premixed flame – bundle of challenges Larger dimensions, larger power Simulation in progress. Not converged solution Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Montestigliano Spring School Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Montestigliano Spring School Rijke tube and its Simulink model (low order simulator) Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Montestigliano Spring School Limit Cycle simulations Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Montestigliano Spring School Inspiration Numerical FDF from OpenFOAM Simulations of Limit Cycle in Simulink 3n FDF: response of n flame zones to velocity and stoichiometry A A C E E Acoustic waves B B D F F φax φax φax Waves of stoichiometry φdiag φdiag φdiag Velocity measurement Flame zone 1 Flame zone n Sensor Outlet Inlet … Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Simulink low order model can be used for prediction of Limit Cycle Conclusions TFC and FSC flame models were tested on the BRS test rig Gain of FTF obtained using FSC model is in a good agreement with experiments Shift in phase of FTF is due to the shifted position of the flame predicted by simulations with correspondence to experiments To deal with non-adiabatic cases, like BRS test rig, corrections that take into account coupled effect of heat losses and shear stress should be made Success of obtaining FTF using 2 methods Simulink low order model can be used for prediction of Limit Cycle Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Future investigations Ongoing work with Alessandra Bigongiari: Prediction of humming on BRS test rig using Green function approach and FSC model for obtaining Flame Describing Function Comparison of the results of Simulink vs Green Function approach applied to BRS test rig Investigation of humming in Ansaldo Energia adiabatic test rig Using OpenFOAM for obtaining FDF, Simulink for Limit Cycle simulations Perform stability analysis of Ansaldo test rig using 3n FDF Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Suggestions for TANGO-2 Extend FSC or TFC model to include corrections that take into account coupled effect of heat losses and shear stress Numerical and analytical study of combustion instabilities in industrial gas turbine. Dmytro Iurashev

Thank you for your attention! Numerical and analytical study of combustion instabilities in industrial gas turbine Thank you for your attention! Dmytro Iurashev dmytro.iurashev@extaen.ansaldo.it 15