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A review of momentum models for the actuator disk in yaw

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Author: Hur, C. · Berdowski, T. · Ferreira, C. · Schepers, G. · Boorsma, K.
Type:article
Date:2019
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
Source:AIAA Scitech 2019 Forum, AIAA Scitech Forum, 2019, 7 January 2019 through 11 January 2019, 1-15
Identifier: 868198
doi: doi:10.2514/6.2019-1799
ISBN: 9781624105784
Keywords: Aviation · Boundary element method · Flight dynamics · Momentum · Energy Efficiency · Energy / Geological Survey Netherlands

Abstract

BEM (Bladed Element Momentum) models have shown to be inaccurate in predicting loads in the case of yawed flow [1-3]. Actuator disk momentum theory is the basis for BEM codes, following Glauert's auto-gyro theory [4]. Therefore, a first step to improve BEM in yawed flow is to assess momentum models for the actuator disk in yaw and investigate possibilities for improvement. In the past, several models have been developed for an actuator disc under yawed conditions, but they are subject to various assumptions. In this paper, different yaw models for the actuator disk will be reviewed and compared against higher fidelity models: fixed and free [5] wake vortex models so that the earlier made assumptions can be assessed. The comparison considers the case of a uniformly loaded actuator disk at varying yaw angle (0ø90ø) and thrust coefficient (0.1~0.9). From the models which have been assessed, 'ye's correction [6] performs best, however, this model too suffers from deficiencies. This indicates that an improved momentum model for yawed flow is necessary. (c) 2019 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.