| Ref.No: | 61517700 |
| Start date: | 17.07.2024 |
| End date: | 16.12.2026 |
| Approval date: | 10.07.2024 |
| Department: | MECHANICAL ENGINEERING |
| Sector: | FLUIDS |
| Financier: | 5η ΠΡΟΚΗΡΥΞΗ ΕΛΙΔΕΚ Υ.Δ., ELIDEK |
| Budget: | 26.100,00 € |
| Public key: | 90Ο646ΨΖΣ4-1ΝΔ |
| Scientific Responsible: | Assist. Prof. MANOLESOS |
| Email: | marinos@fluid.mech.ntua.gr |
| Description: | THIS DISSERTATION AIMS TO INVESTIGATE THE COMPLEX FLUID MECHANICS ASSOCIATED WITH THE WAKE OF BLUNT TRAILING EDGE (TE) AIRFOILS, REFERRED TO AS FLATBACK (FB) AIRFOILS, AND PROPOSE A NOVEL PASSIVE FLOW CONTROL MECHANISM IN ORDER TO REDUCE THEIR BASE DRAG. NOWADAYS, FB AIRFOILS ARE COMMONLY USED AT THE INBOARD PART OF LARGE HORIZONTAL AXIS WIND TURBINE (WT) BLADES AS THEY OFFER AERODYNAMIC, AEROELASTIC, AND STRUCTURAL ADVANTAGES COMPARED TO THEIR THIN TE COUNTERPARTS. CONSEQUENTLY, FB AIRFOILS OPERATE AT HIGH REYNOLDS NUMBERS AND NON-ZERO ANGLES OF ATTACK (AOA). BOTH NUMERICAL SIMULATIONS AND WIND TUNNEL EXPERIMENTS HAVE IDENTIFIED A LOW-DRAG REGIME FOR A RANGE OF AOA BEFORE STALL. THIS DISSERTATION WILL IDENTIFY THE MECHANISM BEHIND THIS LOW-DRAG REGIME USING STATE-OF-THE-ART HIGH-FIDELITY NUMERICAL SIMULATIONS AND WIND TUNNEL MEASUREMENTS. SPECIFICALLY, DETACHED EDDY SIMULATIONS (DES) WILL BE CARRIED OUT FOR A RANGE OF AOA AND VARIOUS PASSIVE FLOW CONTROL DEVICES, UTILIZING HIGH-PERFORMANCE COMPUTING (HPC) SYSTEMS. FURTHERMORE, STATE-OF-THE-ART SURFACE PRESSURE (TRANSIENT PRESSURE TRANSDUCERS) AND VELOCITY FIELD (STEREO AND TOMO PIV) MEASUREMENT TECHNIQUES WILL BE UTILIZED IN ORDER TO STUDY THE FORCES AND WAKE BEHAVIOR OF FB AIRFOILS FOR A RANGE OF AOA AND PASSIVE FLOW CONTROL DEVICES. ADDITIONALLY, DATA-DRIVEN DECOMPOSITION TECHNIQUES WILL BE USED TO ANALYZE THE RESULTS OF THESE CAMPAIGNS, GIVING NEW INSIGHTS INTO THE WAKE BEHAVIOR AND INSTABILITIES, WHICH WILL LEAD TO THE DEVELOPMENT OF A NOVEL INHOMOGENEOUS PASSIVE FLOW CONTROL SOLUTION. FINALLY, THE EFFECT OF THE PROPOSED MECHANISM ON THE PERFORMANCE OF A REFERENCE OFFSHORE WIND TURBINE WILL BE ASSESSED. |
