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Computational analysis of the flow field and noise radiation of a generic main landing gear configuration

Computational analysis of the flow field and noise radiation of a generic main landing gear configuration
Computational analysis of the flow field and noise radiation of a generic main landing gear configuration
This study investigates the flow field and acoustics of a generic four wheel main landing gear. The landing gear is an important airframe noise source during the approach phase. The characteristics of the flow field around the bogie area of the main landing gear are largely unknown. CFD simulations using the DES turbulence model have been used to calculate the unsteady flow field around a generic landing gear model. The surface pressure data has been sampled and used in a FW-H solver to determine far field noise levels. Two different landing gear models have been used, a simplified geometry and a more realistic complex geometry. Three different bogie angles have been simulated: horizontal bogie aligned with the flow, 10? toe up and 10? toe down. Strong streamwise vortices are generated at the front wheels of the landing gear. The trajectory of these vortices determines where the turbulent flow interacts with the downstream components. This interaction leads to surface pressure fluctuations which are a major noise source. The flow field of the simplified configurations shows a consistent trend of the trajectory of the streamwise vortices with respect to changes in bogie angle. The far field noise levels generated by the different components of the simplified configurations are related to the distance at which the streamwise vortices pass. The additional components of the complex landing gear geometry change the characteristics of the flow field. The strong streamwise vortices persist but they do not show the same trend as for the simplified configurations. The wake of the articulation link generates a turbulent in flow for the other components. The different characteristics of the flow field of the complex configurations lead to significant changes in the far field noise levels of the components compared to the simplified configurations.
Van Mierlo, Koen
0f07264c-8cb8-4842-9e32-a66f165ed843
Van Mierlo, Koen
0f07264c-8cb8-4842-9e32-a66f165ed843
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421

Van Mierlo, Koen (2014) Computational analysis of the flow field and noise radiation of a generic main landing gear configuration. University of Southampton, Engineering and the Environment, Doctoral Thesis, 271pp.

Record type: Thesis (Doctoral)

Abstract

This study investigates the flow field and acoustics of a generic four wheel main landing gear. The landing gear is an important airframe noise source during the approach phase. The characteristics of the flow field around the bogie area of the main landing gear are largely unknown. CFD simulations using the DES turbulence model have been used to calculate the unsteady flow field around a generic landing gear model. The surface pressure data has been sampled and used in a FW-H solver to determine far field noise levels. Two different landing gear models have been used, a simplified geometry and a more realistic complex geometry. Three different bogie angles have been simulated: horizontal bogie aligned with the flow, 10? toe up and 10? toe down. Strong streamwise vortices are generated at the front wheels of the landing gear. The trajectory of these vortices determines where the turbulent flow interacts with the downstream components. This interaction leads to surface pressure fluctuations which are a major noise source. The flow field of the simplified configurations shows a consistent trend of the trajectory of the streamwise vortices with respect to changes in bogie angle. The far field noise levels generated by the different components of the simplified configurations are related to the distance at which the streamwise vortices pass. The additional components of the complex landing gear geometry change the characteristics of the flow field. The strong streamwise vortices persist but they do not show the same trend as for the simplified configurations. The wake of the articulation link generates a turbulent in flow for the other components. The different characteristics of the flow field of the complex configurations lead to significant changes in the far field noise levels of the components compared to the simplified configurations.

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More information

Published date: February 2014
Organisations: University of Southampton, Computational Engineering & Design Group

Identifiers

Local EPrints ID: 388076
URI: http://eprints.soton.ac.uk/id/eprint/388076
PURE UUID: 3ea44b7a-538a-4315-a21f-bd7dba99dbc8

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Date deposited: 22 Feb 2016 11:28
Last modified: 18 Jul 2017 04:28

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Contributors

Author: Koen Van Mierlo
Thesis advisor: Xin Zhang

University divisions

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