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Main Title: Aeroelastic assessment of a highly loaded high pressure compressor exposed to pressure gain combustion disturbances
Author(s): Bicalho Civinelli de Almeida, Victor
Peitsch, Dieter
Type: Article
Language Code: en
Abstract: A numerical aeroelastic assessment of a highly loaded high pressure compressor exposed to flow disturbances is presented in this paper. The disturbances originate from novel, inherently unsteady, pressure gain combustion processes, such as pulse detonation, shockless explosion, wave rotor or piston topping composite cycles. All these arrangements promise to reduce substantially the specific fuel consumption of present-day aeronautical engines and stationary gas turbines. However, their unsteady behavior must be further investigated to ensure the thermodynamic efficiency gain is not hindered by stage performance losses. Furthermore, blade excessive vibration (leading to high cycle fatigue) must be avoided, especially under the additional excitations frequencies from waves traveling upstream of the combustor. Two main numerical analyses are presented, contrasting undisturbed with disturbed operation of a typical industrial core compressor. The first part of the paper evaluates performance parameters for a representative blisk stage with high-accuracy 3D unsteady Reynolds-averaged Navier-Stokes computations. Isentropic efficiency as well as pressure and temperature unsteady damping are determined for a broad range of disturbances. The nonlinear harmonic balance method is used to determine the aerodynamic damping. The second part provides the aeroelastic harmonic forced response of the rotor blades, with aerodynamic damping and forcing obtained from the unsteady calculations in the first part. The influence of blade mode shapes, nodal diameters and forcing frequency matching is also examined.
Issue Date: 15-Oct-2018
Date Available: 2-Nov-2018
DDC Class: 600 Technik, Technologie
Subject(s): aeroelasticity
forced response
unsteady performance
axial compressor
high pressure compressor
pressure gain combustion
Sponsor/Funder: DFG, TH 662/19-1, Open Access Publizieren 2017 - 2018 / Technische Universität Berlin
Journal Title: Journal of the Global Power and Propulsion Society
Publisher: Veruscript
Publisher Place: London
Volume: 2
Publisher DOI: 10.22261/JGPPS.F72OUU
Page Start: 477
Page End: 492
EISSN: 2515-3080
Appears in Collections:FG Luftfahrtantriebe » Publications

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