Theory For Broadband Noise Of Rotor And Stator Cascades With Inhomogeneous Inflow Turbulence Including Effects Of Lean And Sweep PDF Download
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| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 86 |
| Release | : 2018-06-11 |
| Genre | : |
| ISBN | : 9781721026104 |
Download Theory for Broadband Noise of Rotor and Stator Cascades with Inhomogeneous Inflow Turbulence Including Effects of Lean and Sweep Book in PDF, ePub and Kindle
The problem of broadband noise generated by turbulence impinging on a downstream blade row is examined from a theoretical viewpoint. Equations are derived for sound power spectra in terms of 3 dimensional wavenumber spectra of the turbulence. Particular attention is given to issues of turbulence inhomogeneity associated with the near field of the rotor and variations through boundary layers. Lean and sweep of the rotor or stator cascade are also handled rigorously with a full derivation of the relevant geometry and definitions of lean and sweep angles. Use of the general theory is illustrated by 2 simple theoretical spectra for homogeneous turbulence. Limited comparisons are made with data from model fans designed by Pratt & Whitney, Allison, and Boeing. Parametric studies for stator noise are presented showing trends with Mach number, vane count, turbulence scale and intensity, lean, and sweep. Two conventions are presented to define lean and sweep. In the "cascade system" lean is a rotation out of its plane and sweep is a rotation of the airfoil in its plane. In the "duct system" lean is the leading edge angle viewing the fan from the front (along the fan axis) and sweep is the angle viewing the fan from the side (, perpendicular to the axis). It is shown that the governing parameter is sweep in the plane of the airfoil (which reduces the chordwise component of Mach number). Lean (out of the plane of the airfoil) has little effect. Rotor noise predictions are compared with duct turbulence/rotor interaction noise data from Boeing and variations, including blade tip sweep and turbulence axial and transverse scales are explored.Hanson, Donald B.Glenn Research CenterINTERACTIONAL AERODYNAMICS; ROTORS; STATORS; CASCADE FLOW; TURBOFAN ENGINES; HOMOGENEOUS TURBULENCE; NOISE PREDICTION; ENGINE NOISE; POWER SPECTRA; LEADING EDGES; DUCTS; BROADBAND; BLADE TIPS; AIRFOILS; BOUNDARY LAYERS; MACH NUMBER; SWEEP ANGLE
| Author | : |
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| Total Pages | : 92 |
| Release | : 2001 |
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| ISBN | : |
Download Theory for Broadband Noise of Rotor and Stator Cascades with Inhomogeneous Inflow Turbulence Including Effects of Lean and Sweep Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 98 |
| Release | : 2001 |
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| ISBN | : |
Download Broadband Noise of Fans - With Unsteady Coupling Theory to Account for Rotor and Stator Reflection/Transmission Effects Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 836 |
| Release | : 2002 |
| Genre | : Government publications |
| ISBN | : |
Download Monthly Catalog of United States Government Publications Book in PDF, ePub and Kindle
| Author | : Acoustical Society of America |
| Publisher | : |
| Total Pages | : 1360 |
| Release | : 2006 |
| Genre | : Acoustical engineering |
| ISBN | : |
Download The Journal of the Acoustical Society of America Book in PDF, ePub and Kindle
| Author | : American Institute of Aeronautics and Astronautics |
| Publisher | : |
| Total Pages | : 1024 |
| Release | : 2006 |
| Genre | : Aeronautics |
| ISBN | : |
Download AIAA Journal Book in PDF, ePub and Kindle
| Author | : E. Envia |
| Publisher | : |
| Total Pages | : |
| Release | : 1996 |
| Genre | : |
| ISBN | : |
Download Analytical Assessment of Stator Sweep and Lean in Reducing Rotor-stator Tone Noise Book in PDF, ePub and Kindle
| Author | : Harvey H. Hubbard |
| Publisher | : |
| Total Pages | : 620 |
| Release | : 1991 |
| Genre | : Aerodynamic noise |
| ISBN | : |
Download Aeroacoustics of Flight Vehicles Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 26 |
| Release | : 2002 |
| Genre | : |
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Download Acoustic Benefits of Stator Sweep and Lean for a High Tip Speed Fan Book in PDF, ePub and Kindle
| Author | : Kenneth C. Hall |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 605 |
| Release | : 2006-05-11 |
| Genre | : Technology & Engineering |
| ISBN | : 1402046057 |
Download Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines Book in PDF, ePub and Kindle
This textbook is a collection of technical papers that were presented at the 10th International Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September 8-11, 2003 at Duke University in Durham, North Carolina. The papers represent the latest in state of the art research in the areas of aeroacoustics, aerothermodynamics, computational methods, experimental testing related to flow instabilities, flutter, forced response, multistage, and rotor-stator effects for turbomachinery.
