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Assessment of aerodynamic challenges of a variable-speed power turbine for large civil tilt-rotor application
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Welch, Gerand E. |
| Copyright Year | 2010 |
| Description | The main rotors of the NASA Large Civil Tilt-Rotor notional vehicle operate over a wide speed-range (100% at take-off to 54% at cruise). The variable-speed power turbine, when coupled to a fixed-gear-ratio transmission, offers one approach to accomplish this speed variation. The key aero-challenges of the variable-speed power turbine are related to high work factors at cruise, where the power turbine operates at 54% of take-off speed, wide incidence variations into the vane, blade, and exit-guide-vane rows associated with the power-turbine speed change, and the impact of low aft-stage Reynolds number (transitional flow) at 28 kft cruise. Meanline and 2-D Reynolds-Averaged Navier- Stokes analyses are used to characterize the variable-speed power-turbine aerodynamic challenges and to outline a conceptual design approach that accounts for multi-point operation. Identified technical challenges associated with the aerodynamics of high work factor, incidence-tolerant blading, and low Reynolds numbers pose research needs outlined in the paper |
| File Size | 2023052 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100033737 |
| Archival Resource Key | ark:/13960/t3qv8hg27 |
| Language | English |
| Publisher Date | 2010-08-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Low Reynolds Number Tilt Rotor Aircraft Rotors Reynolds Averaging Transition Flow Takeoff Turbines Guide Vanes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
