Εθνικό Μετσόβιο Πολυτεχνείο National Technical University of Athens. Aerodynamics & Aeroelasticity: Applications Σπύρος Βουτσινάς / Spyros Voutsinas

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1 Εθνικό Μετσόβιο Πολυτεχνείο National Technical University of Athens Aerodynamics & Aeroelasticity: Applications Σπύρος Βουτσινάς / Spyros Voutsinas

2 Άδεια Χρήσης Το παρόν εκπαιδευτικό υλικό υπόκειται σε άδειες χρήσης Creative Commons. Για εκπαιδευτικό υλικό, όπως εικόνες, που υπόκειται σε άδεια χρήσης άλλου τύπου, αυτή πρέπει να αναφέρεται ρητώς. Aerodynamics & Aeroelasticity: Applications 2

3 The basic modes at stand-still Yaw and Tilt coupled rotor-flap tower modes 1 st asymmetric lag mode Aerodynamics & Aeroelasticity: Applications 3

4 The basic modes at stand-still 10,00 9,00 8,00 7,00 6,00 5,00 4,00 3,00 2,00 multiples of the rotational frequency 1,00 Μηχανή 500kW stall 1 Μηχανή 1300kW 2 stall Μηχανή 500kW pitch 3 1st Tower bending mode (lateral) 1st Tower bending mode (windwise) Drive Train Torsion 1st assymetric flapping mode (yaw) 1st assymetric flapping mode (tilt) 1st symmetric flapping mode 1st lead-lag assymetric mode 1st assymetric mode 0,00 M1 M2 M3 M4 M5 M6 M7 M8 eigenfrequencies Aerodynamics & Aeroelasticity: Applications 4

5 Performance assessment flapwise bending moment at 0.308m (KNm) RAFT measurements wind speed (m/s) shaft torque (KNm) wind speed (m/s) RAFT measurements Performance assessment usually concerns the aerodynamic performance of the rotor These results allow to assess (or correct) the profile aerodynamic characteristics we use in comprehensive codes such as BEM. Aerodynamics & Aeroelasticity: Applications 5

6 Dynamic simulations Case 1 1P=0.5Hz Case 2 1P=0.5Hz Case 3 1P= Hz Mode Calc. Meas. Calc. Meas. Calc. Meas. Μ1. 1 st tower bending mode (lateral) Μ2. 1 st tower bending mode (front-back) Μ3. 1 st drive train torsion mode Μ4. 1 st asymmetric flap-yaw mode Μ5. 1 st asymmetric flap-tilt mode Μ6. 1 st symmetric flap mode * Μ7. 1 st asymmetric rotor mode A * Μ8. 1 st asymmetric rotor mode B Aerodynamics & Aeroelasticity: Applications 6

7 Simulation input Nominal Power(kW) 500 Rotor Diameter (m) 37 Number of blades 3 rotational frequency (Hz) 0.50 Hub height (m) 35 Tower type Cylindrical Power control Stall Location of tower Upwind Κιβώτιο Ταχυτήτων Generator Yes Asynchronous U V W (m/s) (m/s) (m/s) σ u σ v σ w L u L v L w (m/s) (m/s) (m/s) (m) (m) (m) A u A v A w φ y a Aerodynamics & Aeroelasticity: Applications 7

8 Azimuth averaged loads (deterministic) 500KW stall Uwind=13.2 m/s (yaw)=0.0 o Aerodynamics & Aeroelasticity: Applications 8

9 Azimuth averaged loads (deterministic) 500KW stall Uwind=13.2 m/s (yaw)=0.0 o Aerodynamics & Aeroelasticity: Applications 9

10 Azimuth averaged loads (deterministic) 500KW stall Uwind=13.2 m/s (yaw)=0.0 o 500KW stall Uwind=15.4 m/s (yaw)=-6.0 o Aerodynamics & Aeroelasticity: Applications 10

11 10.1 m/s, yaw=-58.9, wind shear a= m/s, yaw=-6.4, wind shear a=0.137 Aerodynamics & Aeroelasticity: Applications 11

12 Load spectra Mode description Calc. Meas. Lateral Tower bemding mode Windwise Tower bending mode Torsional mode Assymetric flap (yaw) Assymetric flap (tilt) Symmetric flap Asymmetric edge Asymmetric edge Aerodynamics & Aeroelasticity: Applications 12

13 Load spectra Mode description Calc. Meas. Lateral Tower bemding mode Windwise Tower bending mode Torsional mode Assymetric flap (yaw) Assymetric flap (tilt) Symmetric flap Asymmetric edge Asymmetric edge Aerodynamics & Aeroelasticity: Applications 13

14 Fatigue loads Aerodynamics & Aeroelasticity: Applications 14

15 Fatigue loads The effect of design L eq i L N m i eq n i 1/ m Normalized L eq 100 Leq 3 R σ u Aerodynamics & Aeroelasticity: Applications 15

16 Fatigue loads The effect of wind conditions Aerodynamics & Aeroelasticity: Applications 16

17 End of presentation Aerodynamics & Aeroelasticity: Applications 17

18 Χρηματοδότηση Το παρόν εκπαιδευτικό υλικό έχει αναπτυχθεί στα πλαίσια του εκπαιδευτικού έργου του διδάσκοντα. Το έργο «Ανοικτά Ακαδημαϊκά Μαθήματα» του ΕΜΠ έχει χρηματοδοτήσει μόνο την αναδιαμόρφωση του υλικού. Το έργο υλοποιείται στο πλαίσιο του Επιχειρησιακού Προγράμματος «Εκπαίδευση και Δια Βίου Μάθηση» και συγχρηματοδοτείται από την Ευρωπαϊκή Ένωση (Ευρωπαϊκό Κοινωνικό Ταμείο) και από εθνικούς πόρους. Aerodynamics & Aeroelasticity: Applications 18