Title: Installation impact on pusher CROR engine low speed performance and noise emission characteristics

Authors: A. Stuermer; Jianping Yin

Addresses: DLR Institute of Aerodynamics and Flow Technology, Lilienthalplatz 7, 38108 Braunschweig, Germany. ' DLR Institute of Aerodynamics and Flow Technology, Lilienthalplatz 7, 38108 Braunschweig, Germany

Abstract: The renewed interest in the contra-rotating open rotor (CROR) as a potential highly efficient powerplant for future transport aircraft has prompted a study into the aerodynamic and aeroacoustic performance of this type of engine at DLR. With significant technical challenges related to the noise emissions and installation effects remaining to be addressed prior to realisation of a viable engine of this type, a study of a generic pusher-configuration CROR propulsion system is presented, which focuses on the impact of installation effects on the rotor aerodynamics and noise emissions. The two primary installation effects angle of attack and the pylon wake are studied utilising a high-fidelity coupled analysis based on unsteady Reynolds averaged Navier-Stokes (uRANS) simulations with the CFD solver TAU and the aeroacoustic analysis tool APSIM, both developed at DLR, highlighting the importance of these aspects on CROR in-plane loads and rotor noise emissions.

Keywords: contra-rotating open rotors; CROR engines; installation effects; uRANS; CAA; rotor noise; unsteady aerodynamics; interaction tones; multi-disciplinary simulation; 1P loads; low speed performance; noise emissions; transport aircraft; aeroacoustics; CROR propulsion systems; simulation; angle of attack; pylon wake.

DOI: 10.1504/IJESMS.2012.044844

International Journal of Engineering Systems Modelling and Simulation, 2012 Vol.4 No.1/2, pp.59 - 68

Published online: 30 Aug 2014 *

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