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Appl. Sci. 2017, 7(6), 639; doi:10.3390/app7060639

Multidisciplinary Aerodynamic Design of a Rotor Blade for an Optimum Rotor Speed Helicopter

Institute for Aero-Engine, School of Aerospace Engineering, Tsinghua University, Tsinghua Yuan No. 1, Beijing 100084, China
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Author to whom correspondence should be addressed.
Academic Editor: Kuang-Chao Fan
Received: 16 May 2017 / Revised: 9 June 2017 / Accepted: 13 June 2017 / Published: 20 June 2017
(This article belongs to the Section Mechanical Engineering)
View Full-Text   |   Download PDF [11695 KB, uploaded 21 June 2017]   |  

Abstract

The aerodynamic design of rotor blades is challenging, and is crucial for the development of helicopter technology. Previous aerodynamic optimizations that focused only on limited design points find it difficult to balance flight performance across the entire flight envelope. This study develops a global optimum envelope (GOE) method for determining blade parameters—blade twist, taper ratio, tip sweep—for optimum rotor speed helicopters (ORS-helicopters), balancing performance improvements in hover and various freestream velocities. The GOE method implements aerodynamic blade design by a bi-level optimization, composed of a global optimization step and a secondary optimization step. Power loss as a measure of rotor performance is chosen as the objective function, referred to as direct power loss (DPL) in this study. A rotorcraft comprehensive code for trim simulation with a prescribed wake method is developed. With the application of the GOE method, a DPL reduction of as high as 16.7% can be achieved in hover, and 24% at high freestream velocity. View Full-Text
Keywords: ORS-helicopter; blade aerodynamic design; global optimum envelope (GOE); prescribed wake method ORS-helicopter; blade aerodynamic design; global optimum envelope (GOE); prescribed wake method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xie, J.; Xie, Z.; Zhou, M.; Qiu, J. Multidisciplinary Aerodynamic Design of a Rotor Blade for an Optimum Rotor Speed Helicopter. Appl. Sci. 2017, 7, 639.

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