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[下载] 旋翼机翼型气动优化

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发表于 2011-6-23 04:50:29 | 显示全部楼层 |阅读模式
Impact of Airfoils on Aerodynamic Optimization of Heavy Lift Rotorcraft

Abstract
Rotor airfoils were developed for two large tiltrotor designs, the Large Civil Tilt Rotor (LCTR) and the Military
Heavy Tilt Rotor (MHTR). The LCTR was the most promising of several rotorcraft concepts produced by the
NASA Heavy Lift Rotorcraft Systems Investigation. It was designed to carry 120 passengers for 1200 nm, with
performance of 350 knots cruise at 30,000 ft altitude. A parallel design, the MHTR, had a notional mission of
40,000 lb payload, 500 nm range, and 300 knots cruise at 4000 ft, 95 F. Both aircraft were sized by the RC code
developed by the U. S. Army Aeroflightdynamics Directorate (AFDD). The rotors were then optimized using the
CAMRAD II comprehensive analysis code. Rotor airfoils were designed for each aircraft, and their effects on
performance analyzed by CAMRAD II. Airfoil design criteria are discussed for each rotor. Twist and taper
optimization are presented in detail for each rotor, with discussions of performance improvements provided by the
new airfoils, compared to current technology airfoils. Effects of stall delay and blade flexibility on performance are
also included.

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