A full-span free-wake model using circular-arc vortex elements and incorporating rotor trim analysis


Hu, G.H. and Newman, S.J. (2006) A full-span free-wake model using circular-arc vortex elements and incorporating rotor trim analysis. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 220, (2), 145-163. (doi:10.1243/09544100G04704).

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Original Publication URL: http://dx.doi.org/10.1243/09544100G04704

Description/Abstract

An analytical method incorporating a free-wake analysis with a rotor trim algorithm is developed for predicting rotor wake geometry and blade loading distribution for a helicopter in hover and forward flight. The wake model of this method is based on a multi-filament full-span free wake, using sophisticated circular-arc vortex elements. The blade model is based on the second-order lifting-line theory to improve the calculation of three-dimensional tip effects. A rotor trim method is given, based on the finite-difference approximation of the blade flapping motion and the trim Jacobian matrix. This is subsequently coupled into the free-wake model. In order to demonstrate the capability of the coupled method, comparisons between the calculated results and the available experimental data of the rotor blade flapping motion for a model rotor are presented covering conditions from hover through forward flight. The free-wake geometry and the blade loading distribution at a low advance ratio are calculated for the H-34 helicopter rotor, and the blade loading distribution is compared with both the measured data and calculated results on the basis of the undistorted wake.

Item Type: Article
ISSNs: 0954-4100 (print)
Related URLs:
Keywords: free wake, vortex element, rotor, trim analysis, helicopter
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 44003
Date Deposited: 07 Feb 2007
Last Modified: 27 Mar 2014 18:28
URI: http://eprints.soton.ac.uk/id/eprint/44003

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