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A Modelling Approach of Variable Geometry for Low Pressure Ratio Fans

Kavvalos, Mavroudis D. and Zaho, Xin and Schnell, Rainer and Aslanidou, Ioanna and Kalfas, Anestis I. and Kyprianidis, Konstantinos (2019) A Modelling Approach of Variable Geometry for Low Pressure Ratio Fans. Internation Society for Air Breathing Engine - ISABE Conference 2019, 22.-27.9.2019, Cynberra, Australien.

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Abstract

This paper presents the development and application of a modelling approach of variable geometry concepts for low pressure ratio fans; namely Variable Area Nozzle and Variable Pitch Fan. An enhanced approach for Outlet Guide Vane pressure loss predictions and an aerothermodynamic analysis of variable pitch concept are developed and integrated into a multi-disciplinary conceptual engine design framework. A streamline curvature algorithm is deployed for the derivation of the off-design fan performance map, alleviating scaling issues from higher pressure ratio fan designs. Correction deltas are derived through the variable pitch analysis for calculating the re-shaped off-design fan performance map. The aforementioned variable geometry concepts are evaluated in terms of surge margin at engine and aircraft level for a low pressure ratio aft-fan of a hybrid-electric configuration. Performance assessments carried out suggest that a +8° closing of fan blade cascades leads to a 33% surge margin improvement (with reference being the surge margin without variable geometry) compared to a 25% improvement achieved by +20% opening the nozzle area at EOR take-off conditions. Although weight and complexity implications of variable geometry are not considered, the integrated modelling approach is shown to be able to assess and compare such novel engine technologies for low pressure ratio fans in terms of operability

Item URL in elib:https://elib.dlr.de/130428/
Document Type:Conference or Workshop Item (Speech)
Title:A Modelling Approach of Variable Geometry for Low Pressure Ratio Fans
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kavvalos, Mavroudis D.Mälardalen University, SwedenUNSPECIFIED
Zaho, XinMälardalen University, SwedenUNSPECIFIED
Schnell, RainerRainer.Schnell (at) dlr.deUNSPECIFIED
Aslanidou, IoannaMälardalen University, SwedenUNSPECIFIED
Kalfas, Anestis I.Aristotle University of ThessalonikiUNSPECIFIED
Kyprianidis, KonstantinosMälardalen University, SwedenUNSPECIFIED
Date:24 September 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Low Pressure Ratio Fan; Variable Area Nozzle; Variable Pitch Fan; Conceptual Design; Engine Performance
Event Title:Internation Society for Air Breathing Engine - ISABE Conference 2019
Event Location:Cynberra, Australien
Event Type:international Conference
Event Dates:22.-27.9.2019
Organizer:Internation Society for Air Breathing Engine - ISABE
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, L - Concepts and Integration
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Schnell, Dr.-Ing. Rainer
Deposited On:18 Nov 2019 12:29
Last Modified:18 Nov 2019 12:29

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