Resonance Effects In The Nasa Transonic Flutter Cascade Facility
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Resonance Effects In The Nasa Transonic Flutter Cascade Facility
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Author :
language : en
Publisher:
Release Date : 2003
Resonance Effects In The Nasa Transonic Flutter Cascade Facility written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Resonance Effects In The Nasa Transonic Flutter Cascade Facility
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-20
Resonance Effects In The Nasa Transonic Flutter Cascade Facility written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-20 with categories.
Investigations of unsteady pressure loadings on the blades of fans operating near the stall flutter boundary are carried out under simulated conditions in the NASA Transonic Flutter Cascade facility (TFC). It has been observed that for inlet Mach numbers of about 0.8, the cascade flowfield exhibits intense low-frequency pressure oscillations. The origins of these oscillations were not clear. It was speculated that this behavior was either caused by instabilities in the blade separated flow zone or that it was a tunnel resonance phenomenon. It has now been determined that the strong low-frequency oscillations, observed in the TFC facility, are not a cascade phenomenon contributing to blade flutter, but that they are solely caused by the tunnel resonance characteristics. Most likely, the self-induced oscillations originate in the system of exit duct resonators. For sure, the self-induced oscillations can be significantly suppressed for a narrow range of inlet Mach numbers by tuning one of the resonators. A considerable amount of flutter simulation data has been acquired in this facility to date, and therefore it is of interest to know how much this tunnel self-induced flow oscillation influences the experimental data at high subsonic Mach numbers since this facility is being used to simulate flutter in transonic fans. In short, can this body of experimental data still be used reliably to verify computer codes for blade flutter and blade life predictions? To answer this question a study on resonance effects in the NASA TFC facility was carried out. The results, based on spectral and ensemble averaging analysis of the cascade data, showed that the interaction between self-induced oscillations and forced blade motion oscillations is very weak and can generally be neglected. The forced motion data acquired with the mistuned tunnel, when strong self-induced oscillations were present, can be used as reliable forced pressure fluctuations provided that they are extracted from
Proceedings Of The Asme Turbo Expo
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Author :
language : en
Publisher:
Release Date : 2003
Proceedings Of The Asme Turbo Expo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Gas-turbines categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
A Review Of Recent Aeroelastic Analysis Methods For Propulsion At Nasa Lewis Research Center
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Author : T. S. R. Reddy
language : en
Publisher:
Release Date : 1993
A Review Of Recent Aeroelastic Analysis Methods For Propulsion At Nasa Lewis Research Center written by T. S. R. Reddy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Computer programs categories.
Nasa Technical Memorandum
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Author :
language : en
Publisher:
Release Date : 1994
Nasa Technical Memorandum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1989
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Mechanics, Applied categories.
Aeronautical Engineering
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Author :
language : en
Publisher:
Release Date : 1991
Aeronautical Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Nasa Scientific And Technical Publications A Catalog Of Special Publications Reference Publications Conference Publications And Technical Papers 1991 1992
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Author :
language : en
Publisher:
Release Date : 1993
Nasa Scientific And Technical Publications A Catalog Of Special Publications Reference Publications Conference Publications And Technical Papers 1991 1992 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeronautics categories.
Nasa Sp
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Author :
language : en
Publisher:
Release Date : 1992
Nasa Sp written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.