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Advanced Low-Noise Research Fan Stage DesignThis report describes the design of the Advanced Low-Noise Research Fan stage. The fan is a variable pitch design, which is designed at the cruise pitch condition. Relative to the cruise setting, the blade is closed at takeoff and opened for reverse thrust operation. The fan stage is a split flow design with fan exit guide vanes (FEGVs) and core stators. The fan stage design is combined with a nacelle and engine core duct to form a powered fan/nacelle subscale model. This model is intended for use in combined aerodynamic, acoustic, and structural testing in a wind tunnel. The fan has an outer diameter of 22 in. and a hub-to-tip of 0.426 in., which allows the use of existing NASA fan and cowl force balance and rig drive systems. The design parameters were selected to permit valid acoustic and aerodynamic comparisons with the Pratt & Whitney (P&W) 17- and 22-in. rigs previously tested under NASA contract. The fan stage design is described in detail. The results of the design axisymmetric and Navier-Stokes aerodynamic analysis are presented at the critical design conditions. The structural analysis of the fan rotor and attachment is included. The blade and attachment are predicted to have adequate low-cycle fatigue life and an acceptable operating range without resonant stress or flutter. The stage was acoustically designed with airfoil counts in the FEGV and core stator to minimize noise. A fan/FEGV tone analysis developed separately under NASA contract was used to determine the optimum airfoil counts. The fan stage was matched to the existing nacelle, designed under the previous P&W low-noise contract, to form a fan/nacelle model for wind tunnel testing. It is an axisymmetric nacelle for convenience in testing and analysis. Previous testing confirmed that the nacelle performed as required at various aircraft operating conditions.
Document ID
19980017196
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Neubert, Robert
(United Technologies Corp. East Hartford, CT United States)
Bock, Larry
(United Technologies Corp. East Hartford, CT United States)
Malmborg, Eric
(United Technologies Corp. East Hartford, CT United States)
Owen-Peer, William
(United Technologies Corp. East Hartford, CT United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1997
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA/CR-97-206308
E-11006
NAS 1.26:206308
Funding Number(s)
CONTRACT_GRANT: NAS3-26618
PROJECT: RTOP-538-03-12-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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