Wake Energy Analysis Method Applied to the Boxprop Propeller Concept
Artikel i vetenskaplig tidskrift, 2018
The present work develops a wake analysis method allowing an energy breakdown of the flow as well as making the irreversibility of the flow explicit by using the entropy lost work concept. The method quantifies the strength of flow features such as tip vortices and wakes in terms of engine power. In contrast to existing work, this method removes assumptions of uniform flow, no radial flow, and constant static pressure in the propeller jet.
The results of the wake analysis method can be summarized into three key findings 1) the energy in the tip-vortex of the Boxprop design is comparatively speaking non-existent, 2) the swirl energy level of the Boxprop is higher and this turbomachine is thus more in need of a downstream counter-rotating blade to recover the energy, 3) the Boxprop develops a much larger part of its thrust closer to the hub. Analysis of this aspect of the flow reveals that blade interference approaching the tip, where the blades in a pair are more closely spaced, is quite pronounced. In turn, this indicates that maximum efficiency Boxprop designs are more likely to be obtained by having larger axial separation of the two blades.
propeller
Open Rotor
Propfan
aircraft propeller
wake energy analysis
CFD
Computational Fluid Dynamics
Författare
Alexandre Capitao Patrao
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Tomas Grönstedt
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Rickard Avellan
GKN Aerospace Sweden
Anders Lundbladh
Chalmers, Mekanik och maritima vetenskaper
Aerospace Science and Technology
1270-9638 (ISSN)
Vol. 79 689-700Innovativ Framdrivning och Motorinstallation
VINNOVA (2013-01189), 2013-07-01 -- 2017-06-30.
Drivkrafter
Hållbar utveckling
Innovation och entreprenörskap
Styrkeområden
Transport
Ämneskategorier
Rymd- och flygteknik
Farkostteknik
Strömningsmekanik och akustik
Infrastruktur
C3SE (Chalmers Centre for Computational Science and Engineering)
DOI
10.1016/j.ast.2018.06.018