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Development and Evaluation of a Performance Estimation Methodology for Fans Operating Within Non-Homogeneous Inflow

Schönweitz, Dirk and Schnell, Rainer (2016) Development and Evaluation of a Performance Estimation Methodology for Fans Operating Within Non-Homogeneous Inflow. In: Processings of the ASME Turbo Expo 2016. ASME Turbo Expo 2016, 13.-17. Juni 2016, Seoul, Südkorea. doi: 10.1115/GT2016-57095.

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The design process of modern aircraft engines extensively makes use of computational fluid dynamics (CFD). During the design process fan, compressor and turbine stages are typically evaluated using single passage CFD-simulations. For the design of an inlet distortion tolerant fan, the inhomogeneity of the inflow in circumferential direction does not allow the application of periodic boundary conditions and hence single passage simulations. Accordingly transient full annulus simulations have to be applied to correctly resolve the underlying physical interactions. The associated computation time for such a high fidelity simulation prohibit its application in today’s design procedures. This paper compares the simulation results of the ingestion of a mild and generic fuselage boundary layer of a blended wing body aircraft into an UHBR engine on the basis of four different simulation methods. The four different simulations include: transient full annulus CFD, Harmonic Balance frequency domain based CFD, steady full annulus CFD (Frozen Rotor) and steady single passage CFD for each blade passage. The results of the simulations are assessed using a newly developed stream tube based post-processing procedure. For the ingestion of the fuselage boundary layer the four numerical setups result in different aerodynamic conditions in the fan stage. For different aerodynamic measures different discrepancies are encountered for the different simulation methods. While the Harmonic Balance method can reproduce most features well, the simpler models overestimate the variations in the different flow features.

Item URL in elib:https://elib.dlr.de/108963/
Document Type:Conference or Workshop Item (Speech)
Title:Development and Evaluation of a Performance Estimation Methodology for Fans Operating Within Non-Homogeneous Inflow
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:13 June 2016
Journal or Publication Title:Processings of the ASME Turbo Expo 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Fan, Fan Aerodynamics, Inflow Distortion, Post-Processing of Unsteady Data
Event Title:ASME Turbo Expo 2016
Event Location:Seoul, Südkorea
Event Type:international Conference
Event Dates:13.-17. Juni 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Schönweitz, Dirk
Deposited On:06 Dec 2016 08:07
Last Modified:06 Dec 2016 08:07

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