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Transonic Rotor Tip Design Using Numerical Optimization by Michael E. Tauber
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1NASA Technical Reports Server (NTRS) 19870019998: Transonic Rotor Tip Design Using Numerical Optimization
By NASA Technical Reports Server (NTRS)
The aerodynamic design procedure for a new blade tip suitable for operation at transonic speeds is illustrated. For the first time, 3 dimensional numerical optimization was applied to rotor tip design, using the recent derivative of the ROT22 code, program R22OPT. Program R22OPT utilized an efficient quasi-Newton optimization algorithm. Multiple design objectives were specified. The delocalization of the shock wave was to be eliminated in forward flight for an advance ratio of 0.41 and a tip Mach number of 0.92 at psi = 90 deg. Simultaneously, it was sought to reduce torque requirements while maintaining effective restoring pitching moments. Only the outer 10 percent of the blade span was modified; the blade area was not to be reduced by more than 3 percent. The goal was to combine the advantages of both sweptback and sweptforward blade tips. A planform that featured inboard sweepback was combined with a sweptforward tip and a taper ratio of 0.5. Initially, the ROT22 code was used to find by trial and error a planform geometry which met the design goals. This configuration had an inboard section with a leading edge sweep of 20 deg and a tip section swept forward at 25 deg; in addition, the airfoils were modified.
“NASA Technical Reports Server (NTRS) 19870019998: Transonic Rotor Tip Design Using Numerical Optimization” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19870019998: Transonic Rotor Tip Design Using Numerical Optimization
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
“NASA Technical Reports Server (NTRS) 19870019998: Transonic Rotor Tip Design Using Numerical Optimization” Subjects and Themes:
- Subjects: ➤ NASA Technical Reports Server (NTRS) - AERODYNAMIC CONFIGURATIONS - BLADE TIPS - OPTIMIZATION - ROTARY WINGS - TRANSONIC SPEED - AIRFOIL PROFILES - COMPUTER PROGRAMS - HELICOPTER DESIGN - SHOCK WAVES - SWEEPBACK - TORQUE - Tauber, Michael E. - Langhi, Ronald G.
Edition Identifiers:
- Internet Archive ID: NASA_NTRS_Archive_19870019998
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