Publications
197 results found
Dhandapani S, Vahdati M, Imregun M, 2008, FORCED RESPONSE AND SURGE BEHAVIOUR OF IP CORE-COMPRESSORS WITH ICE-DAMAGED ROTOR BLADES, 53rd ASME Turbo Expo 2008, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 693-701
Vahdati M, Sayma AI, Imregun M, et al., 2007, Multibladerow forced response modeling in axial-flow core compressors, JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, Vol: 129, Pages: 412-420, ISSN: 0889-504X
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- Citations: 27
M Vahdati, 2007, A numerical strategy for modelling rotating stall in core compressors, International Journal for Numerical Methods in Fluids, Vol: 53(8), Pages: 1381-1397
Wu X, Vahdati M, Schipani C, et al., 2007, Analysis of low-pressure turbine flutter for different shroud interfaces, 52nd ASME Turbo Expo 2007, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 629-636
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- Citations: 2
Vahdati M, Simpson G, Imregun M, 2006, Unsteady, flow and aeroelasticity behaviour of aero-engine core compressors during rotating stall and surge, 51st ASME Turbo Expo 2006, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 153-163
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- Citations: 1
LOHNER R, MORGAN K, VAHDATI M, et al., 2005, FEM-FCT - COMBINING UNSTRUCTURED GRIDS WITH HIGH-RESOLUTION, COMMUNICATIONS IN APPLIED NUMERICAL METHODS, Vol: 4, Pages: 717-729, ISSN: 0748-8025
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- Citations: 64
Vahdati M, Sayma AI, Freeman C, et al., 2005, On the use of atmospheric boundary conditions for axial-flow compressor stall simulations, JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, Vol: 127, Pages: 349-351, ISSN: 0889-504X
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- Citations: 77
Wu X, Vahdati M, Sayma A, et al., 2005, Whole-annulus aeroelasticity analysis of a 17-bladerow WRF compressor using an unstructured Navier-Stokes solver, INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS, Vol: 19, Pages: 211-223, ISSN: 1061-8562
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- Citations: 6
Vahdati M, Sayma AI, Simpson G, et al., 2003, Core-compressor rotating stall simulation with a multi-bladerow model, 10th international symposium on unsteady aerodynamics, aeroacoustics & aeroelasticity of turbomachines, Duke University, Durham, North Carolina, Sept 2003
Simpson G, Peng C, Vahdati M, et al., 2003, Influence of rotor blade damage on flutter and forced response of high pressure compressor blades, 8th national turbine engine high cycle fatigue (HCF) conference, Monterey, CA, USA 14 - 16 April 2003
Simpson G, Peng C, Vahdati M, et al., 2003, Influence of rotor blade damage on flutter and forced response of high pressure compressor blades, 8th national turbine engine high cycle fatigue (HCF) conference, Monterey, CA, USA 14 - 16 April 2003
Sayma AI, Vahdati M, Lee SJ, et al., 2003, Forced response analysis of a shaft-driven lift fan, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE, Vol: 217, Pages: 1125-1137, ISSN: 0954-4062
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- Citations: 3
Wu X, Vahdati M, Sayma AI, et al., 2003, A numerical investigation of aeroacoustic fan blade flutter (GT-2003-38454), ASME turbo expo 2003; oil and gas applications; structures and dynamics; scholar lecture, Publisher: ASME, Pages: 357-364
Wu X, Vahdati M, Sayma AI, et al., 2003, A numerical investigation of aeroacoustic fan blade flutter (GT-2003-38454), ASME turbo expo 2003; oil and gas applications; structures and dynamics; scholar lecture, Publisher: ASME, Pages: 357-364
Bréard C, Sayma AI, Vahdati M, et al., 2002, Aeroelasticity analysis of an industrial gas turbine combustor using a simplified combustion model, JOURNAL OF FLUIDS AND STRUCTURES, Vol: 16, Pages: 1105-1126, ISSN: 0889-9746
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- Citations: 1
Sayma AI, Bréard C, Vahdati M, et al., 2002, Aeroelasticity analysis of air-riding seals for aero-engine applications, JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME, Vol: 124, Pages: 607-616, ISSN: 0742-4787
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- Citations: 19
Vahdati M, Sayma AI, Bréard C, et al., 2002, Computational study of intake duct effects on fan flutter stability, AIAA JOURNAL, Vol: 40, Pages: 408-418, ISSN: 0001-1452
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- Citations: 16
He L, Sayma AI, Vahdati M, et al., 2002, Aeromechanics in turbomachinery. Part 1. Methodologies, IMechE seminar S890. Grand review of the state-of-the-art in the numerical simulation of fluid flow, December 2002
Sayma AI, Vahdati M, Lee SJ, et al., 2002, Overview of shaft driven LiftFan force response analysis, 7th national turbine engine high cycle fatigue (HCF) conference, Palm Beach, Florida, April 2002
Sayma A, Vahdati M, Lee SJ, et al., 2002, Overview of JSF liftFan forced response analyses during the CDA phase, 7th national turbine engine high cycle fatigue conference, Miami, FL, February 2002
Sayma AI, Vahdati M, Imregun M, et al., 2002, Aeromechanics in turbomachinery. Part 2. Applications, IMechE Seminar S890. Grand Review of the state-of-the-art in the numerical simulation of fluid flow, December 2002
Sayma AI, Imregun M, Vahdati M, et al., 2002, Aero-mechanics/Aero-acoustics in turbomachinery, Part 2 Applications" Grand review of the state-of-the-art in the numerical simulation of fluid flow, IMechE, London, Dec. 2002
Bréard C, Green JS, Vahdati M, et al., 2001, A non-linear integrated aeroelasticity method for the prediction of turbine forced response with friction dampers, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, Vol: 43, Pages: 2715-2736, ISSN: 0020-7403
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- Citations: 15
Kim M, Vahdati M, Imregun M, 2001, Aeroelastic stability analysis of a bird-damaged aeroengine fan assembly, AEROSPACE SCIENCE AND TECHNOLOGY, Vol: 5, Pages: 469-482, ISSN: 1270-9638
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- Citations: 14
Barakos G, Vahdati M, Sayma AI, et al., 2001, A fully distributed unstructured Navier-Stokes solver for large-scale aeroelasticity computations, AERONAUTICAL JOURNAL, Vol: 105, Pages: 419-426, ISSN: 0001-9240
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- Citations: 12
Vahdati M, Sayma AI, Marshall JG, et al., 2001, Mechanisms and prediction methods for fan blade stall flutter, JOURNAL OF PROPULSION AND POWER, Vol: 17, Pages: 1100-1108, ISSN: 0748-4658
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- Citations: 48
Sayma AI, Vahdati M, Lee SJ, et al., 2001, Inlet distortion forced response analysis of a vertical lift fan, 6th national turbine engine high cycle fatigue conference, San Antonio, TX, February 2001
Sayma AI, Vahdati M, Lee SJ, et al., 2001, Forced response analysis of a vertical take-off liftfan in aircraft configuration, National turbine engine cycle fatigue conference, 2001, Publisher: Rolls Royce
Sayma AI, Bread C, Vahdati M, et al., 2001, Recent developments in unsteady flow modelling for turbomachinery aeroelasticity, ROLLS ROYCE PLC -REPORT- PNR
Bréard C, Vahdati M, Sayma AI, et al., 2000, An integrated time-domain aeroelasticlty model for the prediction of fan forced response due to inlet distortion
The forced response of a low aspect-ratio transonic fan due to different inlet distortions was predicted using an integrated timedomain aeroelasticity model. A time-accurate, non-linear viscous, unsteady flow representation was coupled to a linear modal model obtained from a standard finite element formulation. The predictions were checked against the results obtained from a previous experimental programme known as "Augmented Damping of Low-aspect-ratio Fans" (ADLARF). Unsteady blade surface pressures, due to inlet distortions created by screens mounted in the intake inlet duct, were measured along a streamline at 85% blade span. Three resonant conditions, namely IF/3EO, 1T & 2F /8EO and 2S/8EO, were considered. Both the amplitude and the phase of the unsteady pressure fluctuations were predicted with and without the blade flexibility. The actual blade displacements and the amount of aerodynamic damping were also computed for the former case. A whole-assembly mesh with about 2,000,000 points was used in some of the computations. Although there were some uncertainties about the aerodynamic boundary conditions, the overall agreement between the experimental and predicted results was found to be reasonably good. The inclusion of the blade motion was shown to have an effect on the unsteady pressure distribution, especially for the 2F/1T case. It was concluded that a full representation of the blade forced response phenomenon should include this feature.
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