1. Numerical and analytical study of combustion instabilities in industrial gas turbine
Author Dmytro Iurashev
Supervisor: Giovanni Campa
Federico Daccà
Alessandro Bottaro
Genova

2. 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

3. 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

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

5. 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

6. 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

7. 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

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

9. 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

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

11. 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

12. 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

13. 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

14. 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

15. Thank you for your attention!
Numerical and analytical study of combustion instabilities in industrial gas turbine
Thank you for your attention!
Dmytro Iurashev 15