CUED Publications database

Challenges in rotor and hub design for a variable diameter tiltrotor

Harrington, A and Milluzzo, J and Seshadri, P and Kalra, T and Chopra, I and Nagaraj, VT (2012) Challenges in rotor and hub design for a variable diameter tiltrotor. In: UNSPECIFIED pp. 224-235..

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This paper presents a review of some of the key challenges in rotor and hub design towards a variable diameter tiltrotor. The AHS 2011 Student Design Competition winning entry, the Excalibur tiltrotor is used as an example to illustrate the numerous design challenges involved. The Excalibur is a variable diameter tiltrotor concept that has been designed to operate in a 6K95 environment for search and rescue, military insertion and resupply missions. The first challenge is addressed with respect to an appropriate choice of disk loading and prop rotor parameters based on Tischenko's sizing methodology. Sparse historical data for tiltrotors makes this an arduous task. This is followed by detailed aerodynamic considerations and tradeoffs for optimizing power loading in hover and propeller efficiency in forward flight. Finally hub mechanics and dynamics are presented with a key emphasis on prior concepts and their disadvantages. Key focus is on the actual blade extension/retraction mechanisms both within the blades and the hub. Copyright © 2011 by the American Helicopter Society International Inc. All rights reserved.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div A > Turbomachinery
Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:20
Last Modified: 22 May 2018 08:08