An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence Nasa Cr 2003 212199
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An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2003
An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence Nasa Cr 2003 212199
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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 2003*
An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence Nasa Cr 2003 212199 written by United States. National Aeronautics and Space Administration 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.
An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-27
An Experimental And Computational Investigation Of Oscillating Airfoil Unsteady Aerodynamics At Large Mean Incidence 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 2018-08-27 with categories.
A major challenge in the design and development of turbomachine airfoils for gas turbine engines is high cycle fatigue failures due to flutter and aerodynamically induced forced vibrations. In order to predict the aeroelastic response of gas turbine airfoils early in the design phase, accurate unsteady aerodynamic models are required. However, accurate predictions of flutter and forced vibration stress at all operating conditions have remained elusive. The overall objectives of this research program are to develop a transition model suitable for unsteady separated flow and quantify the effects of transition on airfoil steady and unsteady aerodynamics for attached and separated flow using this model. Furthermore, the capability of current state-of-the-art unsteady aerodynamic models to predict the oscillating airfoil response of compressor airfoils over a range of realistic reduced frequencies, Mach numbers, and loading levels will be evaluated through correlation with benchmark data. This comprehensive evaluation will assess the assumptions used in unsteady aerodynamic models. The results of this evaluation can be used to direct improvement of current models and the development of future models. The transition modeling effort will also make strides in improving predictions of steady flow performance of fan and compressor blades at off-design conditions. This report summarizes the progress and results obtained in the first year of this program. These include: installation and verification of the operation of the parallel version of TURBO; the grid generation and initiation of steady flow simulations of the NASA/Pratt&Whitney airfoil at a Mach number of 0.5 and chordal incidence angles of 0 and 10 deg.; and the investigation of the prediction of laminar separation bubbles on a NACA 0012 airfoil.Capece, Vincent R. and Platzer, Max F.Glenn Research CenterUNSTEADY AERODYNAMICS; TURBOMACHINERY; AIRFOILS; AEROELASTICITY; GAS TURBINE ENGINES; INCIDENCE; FORCED VIBRATION...
Investigation Of Oscillating Cascade Aerodynamics By An Experimental Influence Coefficient Technique
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-05
Investigation Of Oscillating Cascade Aerodynamics By An Experimental Influence Coefficient Technique 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 2018-07-05 with categories.
Fundamental experiments are performed in the NASA Lewis Transonic Oscillating Cascade Facility to investigate the torsion mode unsteady aerodynamics of a biconvex airfoil cascade at realistic values of the reduced frequency for all interblade phase angles at a specified mean flow condition. In particular, an unsteady aerodynamic influence coefficient technique is developed and utilized in which only one airfoil in the cascade is oscillated at a time and the resulting airfoil surface unsteady pressure distribution measured on one dynamically instrumented airfoil. The unsteady aerodynamics of an equivalent cascade with all airfoils oscillating at a specified interblade phase angle are then determined through a vector summation of these data. These influence coefficient determined oscillation cascade data are correlated with data obtained in this cascade with all airfoils oscillating at several interblade phase angle values. The influence coefficients are then utilized to determine the unsteady aerodynamics of the cascade for all interblade phase angles, with these unique data subsequently correlated with predictions from a linearized unsteady cascade model. Buffum, Daniel H. and Fleeter, Sanford Glenn Research Center RTOP 535-03-01...
Unsteady Aerodynamics Of An Airfoil Cascade At Large Mean Incidence Due To A Single Airfoil Oscillating In A Pitching Motion
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Author : Jason Neil Hayden
language : en
Publisher:
Release Date : 2003
Unsteady Aerodynamics Of An Airfoil Cascade At Large Mean Incidence Due To A Single Airfoil Oscillating In A Pitching Motion written by Jason Neil Hayden 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.
Aerodynamics Of A Linear Oscillating Cascade
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-23
Aerodynamics Of A Linear Oscillating Cascade 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 2018-07-23 with categories.
The steady and unsteady aerodynamics of a linear oscillating cascade are investigated using experimental and computational methods. Experiments are performed to quantify the torsion mode oscillating cascade aerodynamics of the NASA Lewis Transonic Oscillating Cascade for subsonic inlet flowfields using two methods: simultaneous oscillation of all the cascaded airfoils at various values of interblade phase angle, and the unsteady aerodynamic influence coefficient technique. Analysis of these data and correlation with classical linearized unsteady aerodynamic analysis predictions indicate that the wind tunnel walls enclosing the cascade have, in some cases, a detrimental effect on the cascade unsteady aerodynamics. An Euler code for oscillating cascade aerodynamics is modified to incorporate improved upstream and downstream boundary conditions and also the unsteady aerodynamic influence coefficient technique. The new boundary conditions are shown to improve the unsteady aerodynamic influence coefficient technique. The new boundary conditions are shown to improve the unsteady aerodynamic predictions of the code, and the computational unsteady aerodynamic influence coefficient technique is shown to be a viable alternative for calculation of oscillating cascade aerodynamics. Buffum, Daniel H. and Fleeter, Sanford Glenn Research Center NASA-TM-103250, E-5677, NAS 1.15:103250 RTOP 535-05-01...
An Investigation Of Unsteady Aerodynamics On An Oscillating Airfoil
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Author : Stephen Marc Batill
language : en
Publisher:
Release Date : 1972
An Investigation Of Unsteady Aerodynamics On An Oscillating Airfoil written by Stephen Marc Batill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
Experimental Studies Of Scale Effects On Oscillating Airfoils At Transonic Speeds
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Author :
language : en
Publisher:
Release Date : 1980
Experimental Studies Of Scale Effects On Oscillating Airfoils At Transonic Speeds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Research On Aeroelastic Phenomena In Airfoil Cascades An Experimental Investigation Of The Unsteady Aerodynamics Of A Controlled Oscillating Mca Airfoil Cascade
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Author : Sanford Fleeter
language : en
Publisher:
Release Date : 1976
Research On Aeroelastic Phenomena In Airfoil Cascades An Experimental Investigation Of The Unsteady Aerodynamics Of A Controlled Oscillating Mca Airfoil Cascade written by Sanford Fleeter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
A unique unsteady cascade experiment directed at providing fundamental aerodynamic data needed to verify or direct refinements to the basic model on unstalled supersonic torsional flutter in turbomachines is presented. In particular, the steady, quasi-static, and unsteady aerodynamics were determined for a multiple circular arc (MCA) airfoil cascade which modeled the tip section of an advanced design fan blade. The MCA cascade was harmonically oscillated in the torsional mode at a reduced frequency value of 0.14. The fundamental unsteady aerodynamic data was obtained at a Mach number equal to 1.55 over a range of interblade phase angles for two values of the cascade static pressure ratio. These unsteady results were then correlated with the predictions from state-of-the-art unsteady flat plate cascade analyses.
Unsteady Aerodynamics Of A Flapping Airfoil
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Author : Sunetra Sarkar
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2010-03
Unsteady Aerodynamics Of A Flapping Airfoil written by Sunetra Sarkar and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03 with categories.
This book analyzes the unsteady, viscous flow-field of an oscillating airfoil. This has ramifications on understanding the flapping flight of natural biological systems like fishes and invertebrates. It also helps towards a better aerodynamic design and understanding of flapping types MAVs. The flow-field simulation is performed with a grid-free Lagrangian particle based solver using vorticity particles. An examination of the unsteady aerodynamic load and the qualitative wake structures are done for airfoils undergoing pitch and plunge oscillations. The propulsive behavior is investigated at medium to high frequency ranges for different relevant parameters. These are amplitude of oscillation, mean angle of attack, and rotational axis location. Asymmetric sinusoidal motions are also examined. Dynamic stall is another important aspect of unsteady aerodynamics that airfoils and wings experience during their time dependent movement at large angles of attack. Insects use this phenomenon to increase the aerodynamic loads during their large angle flapping maneuvers. This aspect is also studied in this book.