APIAN-INF

A Low-Speed Aerodynamic and Aeroacoustic Investigation of Pylon – Pusher Propeller Interaction Effects

Conference paper (2015)
Department
Aerodynamics, Wind Energy & Propulsion (Aerospace Engineering) (TU Delft)
Copyright: This work is licensed under the Creative Commons Attribution International License (CC BY)
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Published Date

07-09-2015

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Source:

CEAS 2015: 5th CEAS Air and Space Conference "Challenges in European Aerospace", Delft, The Netherlands, 7-11 September 2015

Faculty

Aerospace Engineering

Department

Aerodynamics, Wind Energy & Propulsion

Abstract

An experimental investigation was performed at the Large Low-speed Facility of the German-Dutch wind tunnels (DNW-LLF) to study the pylon interactions associated with pusher propellers. The aerodynamic and aeroacoustic effects of pylon trailing edge blowing and swirl recovery vanes (SRVs) were evaluated. The pylon installation increased the summed tonal noise levels by up to 13 dB in unblown conditions, while the propulsive performance was affected in asymmetric inflow conditions only. At a sideslip angle of +6°, pre-swirl of the flow due to the pylon tip vortex led to a thrust increase of 10% at high thrust up to 45% at a low thrust setting. Stereoscopic PIV measurements showed the beneficial effect of pylon blowing in compensating the momentum deficit in the pylon wake. At the optimal blowing rate, a recovery effect of about 80% was obtained compared to the unblown case. Application of the blowing system eliminated the pylon installation penalty, recovering the noise levels to those measured for the isolated propeller. Installation of the SRVs downstream of the isolated propeller resulted in a swirl recovery of 50%, at the cost of a 2 dB tonal noise increase.

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