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Progress in aerodynamic and aeroacoustic integration of CROR propulsion systems

Published online by Cambridge University Press:  27 January 2016

A. Stuermer ,
J. Yin  and
R. Akkermans
J. Yin
Affiliation:
DLR Institute of Aerodynamics and Flow Technology, Lilienthalplatz, Braunschweig, Germany
R. Akkermans
Affiliation:
DLR Institute of Aerodynamics and Flow Technology, Lilienthalplatz, Braunschweig, Germany
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Abstract

Contra-Rotating Open Rotor (CROR) propulsion systems have seen renewed interest as an economic and environmentally friendly powerplant for future transport aircraft. Installation effects, i.e. the mutual interactions between airframe components and the rotors, have a pronounced impact on the aerodynamic and aeroacoustic performance for this type of engine. In the past five years, DLR’s Institute of Aerodynamics and Flow Technology has performed a number of numerical studies investigating important aspects relating to engine-airframe integration of CROR engines. In this article an overview of coupled aerodynamic and aeroacoustic simulations investigating representative pusher-configuration CROR engines will be given, focusing on the impact on aerodynamic performance and aeroacoustics caused by the presence of a pylon, the potential for noise reduction by employing trailing-edge blowing at the pylon trailing edge as well as the performance and noise variations caused by different senses of rotation of the rotors. It is shown that the interaction with the pylon strongly impacts blade performance and front rotor noise emissions but that the use of active flow control in the form of pylon trailing-edge blowing can alleviate these adverse installation effects to a notable extent.

Type
Research Article
Information
The Aeronautical Journal , Volume 118 , Issue 1208 , October 2014 , pp. 1137 - 1158
Copyright
Copyright © Royal Aeronautical Society 2014 

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