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Modelling transverse gusts using pitching, plunging and surging airfoil motions

Modelling transverse gusts using pitching, plunging and surging airfoil motions
Modelling transverse gusts using pitching, plunging and surging airfoil motions
Three model-motions were developed to replicate the aerodynamic response of a transverse gust. These motions included a pure-plunging and two three degree-of-freedom motions that approximated the angle-of-attack distribution produced by the gust. Using inviscid models and viscous flow simulations, the response of the gust and model-motions were compared as a function of the non-dimensional reduced frequency. The inviscid model was found to overestimate the influence of the rotational added-mass in the three degree-of-freedom motions. In contrast, the viscous flow simulations showed that the two primary sources of discrepancy between the gust and model-motions lie in the non-linear angle-of-attack distribution caused by the gust, and the wake development during the model-motions. Flow simulations showed that all three motions experienced greater than 90% agreement in lift for gusts with reduced frequencies less than 0.5, indicating that under this reduced frequency: 1) the effect of the gust convection is minimal; and 2) a pure-plunging motion may suffice for modelling gusts. However, at higher reduced frequencies the pure-plunging motion experiences greater than 10% worse agreement than the three degree-of-freedom motions. Overall, the motions provide a good approximation with greater than 90% accuracy in lift for gusts of reduced frequencies less than k = 0.75.
0001-1452
Leung, Jordan
2fd99b87-5fa1-4abc-bf11-a914a5995554
Wong, Jamie
64ffa4d3-f209-407e-8f05-fb7372d325fd
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Rival, David
a2e24ff6-d135-4c51-ac7a-7c8877a18f5d
Leung, Jordan
2fd99b87-5fa1-4abc-bf11-a914a5995554
Wong, Jamie
64ffa4d3-f209-407e-8f05-fb7372d325fd
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Rival, David
a2e24ff6-d135-4c51-ac7a-7c8877a18f5d

Leung, Jordan, Wong, Jamie, Weymouth, Gabriel and Rival, David (2018) Modelling transverse gusts using pitching, plunging and surging airfoil motions. AIAA Journal. (doi:10.2514/1.J056961).

Record type: Article

Abstract

Three model-motions were developed to replicate the aerodynamic response of a transverse gust. These motions included a pure-plunging and two three degree-of-freedom motions that approximated the angle-of-attack distribution produced by the gust. Using inviscid models and viscous flow simulations, the response of the gust and model-motions were compared as a function of the non-dimensional reduced frequency. The inviscid model was found to overestimate the influence of the rotational added-mass in the three degree-of-freedom motions. In contrast, the viscous flow simulations showed that the two primary sources of discrepancy between the gust and model-motions lie in the non-linear angle-of-attack distribution caused by the gust, and the wake development during the model-motions. Flow simulations showed that all three motions experienced greater than 90% agreement in lift for gusts with reduced frequencies less than 0.5, indicating that under this reduced frequency: 1) the effect of the gust convection is minimal; and 2) a pure-plunging motion may suffice for modelling gusts. However, at higher reduced frequencies the pure-plunging motion experiences greater than 10% worse agreement than the three degree-of-freedom motions. Overall, the motions provide a good approximation with greater than 90% accuracy in lift for gusts of reduced frequencies less than k = 0.75.

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Leung_Wong_Weymouth_Rival_AIAA_Manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 17 April 2018
e-pub ahead of print date: 31 May 2018

Identifiers

Local EPrints ID: 421633
URI: http://eprints.soton.ac.uk/id/eprint/421633
ISSN: 0001-1452
PURE UUID: 1d02429d-4335-4d57-94d6-7f22718c688f
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

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Date deposited: 18 Jun 2018 16:30
Last modified: 07 Oct 2020 02:03

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