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On the optimum separation distance for minimum noise of contra-rotating propellers

On the optimum separation distance for minimum noise of contra-rotating propellers
On the optimum separation distance for minimum noise of contra-rotating propellers
Overlapping propeller systems are currently used on some urban flight vehicles and will become increasingly common in future electric propulsion, since they provide one of the most compact platform volumes per thrust. This paper presents the results of a detailed experimental investigation of co-axial contra-rotating propeller configuration at hover condition. A detailed parametric study is performed to investigate the sensitivity of radiated noise to axial separation distance. An optimum separation distance z to propeller diameter D of 0.25 has been identified, whereby minimum radiated noise is obtained. The reason for this optimum has been explored and the balance between various interaction noise sources in co-axial configuration is discussed in the paper. It is also shown that the minimum radiated noise was roughly found where the aerodynamic efficiency is maximum.
0022-1120
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Prior, Stephen
9c753e49-092a-4dc5-b4cd-6d5ff77e9ced
Parry, Anthony B.
5fde3fdc-35a1-4788-afd8-4b69863c09fb
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Prior, Stephen
9c753e49-092a-4dc5-b4cd-6d5ff77e9ced
Parry, Anthony B.
5fde3fdc-35a1-4788-afd8-4b69863c09fb

Paruchuri, Chaitanya, Joseph, Phillip, Prior, Stephen and Parry, Anthony B. (2020) On the optimum separation distance for minimum noise of contra-rotating propellers. Journal of Fluid Mechanics. (Submitted)

Record type: Article

Abstract

Overlapping propeller systems are currently used on some urban flight vehicles and will become increasingly common in future electric propulsion, since they provide one of the most compact platform volumes per thrust. This paper presents the results of a detailed experimental investigation of co-axial contra-rotating propeller configuration at hover condition. A detailed parametric study is performed to investigate the sensitivity of radiated noise to axial separation distance. An optimum separation distance z to propeller diameter D of 0.25 has been identified, whereby minimum radiated noise is obtained. The reason for this optimum has been explored and the balance between various interaction noise sources in co-axial configuration is discussed in the paper. It is also shown that the minimum radiated noise was roughly found where the aerodynamic efficiency is maximum.

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Submitted date: 4 November 2020

Identifiers

Local EPrints ID: 444759
URI: http://eprints.soton.ac.uk/id/eprint/444759
ISSN: 0022-1120
PURE UUID: e3686036-1b89-460c-8582-39fbd4bc16c6
ORCID for Stephen Prior: ORCID iD orcid.org/0000-0002-4993-4942

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Date deposited: 04 Nov 2020 17:30
Last modified: 16 Oct 2021 01:45

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Contributors

Author: Phillip Joseph
Author: Stephen Prior ORCID iD
Author: Anthony B. Parry

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