Summary of Advanced Methods for Predicting High Speed Propeller Performance PDF Download
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Author: Lawrence J. Bober
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Author: Lawrence J. Bober
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Author: Roy D. Hager
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 140
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725814394
Category :
Languages : en
Pages : 34
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Book Description
Advanced high-speed propellers offer large performance improvements for aircraft that cruise in the Mach 0.7 to 0.8 speed regime. The current status of the NASA research program on high-speed propeller aerodynamics, acoustics, and aeroelastics is described. Recent wind tunnel results for five 8- to 10-blade advanced models are compared with analytical predictions. Test results show that blade sweep was important in achieving net efficiencies near 80 percent at Mach 0.8 and reducing near-field cruise noise by dB. Lifting line and lifting surface aerodynamic analysis codes are under development and some initial lifting line results are compared with propeller force and probe data. Some initial laser velocimeter measurements of the flow field velocities of an 8-bladed 45 deg swept propeller are shown. Experimental aeroelastic results indicate that cascade effects and blade sweep strongly affect propeller aeroelastic characteristics. Comparisons of propeller near-field noise data with linear acoustic theory indicate that the theory adequate predicts near-field noise for subsonic tip speeds but overpredicts the noise for supersonic tip speeds. Potential large gains in propeller efficiency of 7 to 11 percent at Mach 0.8 may be possible with advanced counter-rotation propellers. Mitchell, G. A. and Mikkelson, D. C. Glenn Research Center NASA-TM-82891, E-1269, NAS 1.15:82891 RTOP 535-03-12...
Author:
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 276
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 800
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Author:
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 312
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 654
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723513046
Category :
Languages : en
Pages : 262
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Book Description
A computer program, the Propeller Nacelle Aerodynamic Performance Prediction Analysis (PANPER), was developed for the prediction and analysis of the performance and airflow of propeller-nacelle configurations operating over a forward speed range inclusive of high speed flight typical of recent propfan designs. A propeller lifting line, wake program was combined with a compressible, viscous center body interaction program, originally developed for diffusers, to compute the propeller-nacelle flow field, blade loading distribution, propeller performance, and the nacelle forebody pressure and viscous drag distributions. The computer analysis is applicable to single and coaxial counterrotating propellers. The blade geometries can include spanwise variations in sweep, droop, taper, thickness, and airfoil section type. In the coaxial mode of operation the analysis can treat both equal and unequal blade number and rotational speeds on the propeller disks. The nacelle portion of the analysis can treat both free air and tunnel wall configurations including wall bleed. The analysis was applied to many different sets of flight conditions using selected aerodynamic modeling options. The influence of different propeller nacelle-tunnel wall configurations was studied. Comparisons with available test data for both single and coaxial propeller configurations are presented along with a discussion of the results. Egolf, T. Alan and Anderson, Olof L. and Edwards, David E. and Landgrebe, Anton J. Unspecified Center NASA-CR-4199-VOL-1, E-4382, NAS 1.26:4199-VOL-1 NAS3-20961; NAS3-22142; NAS3-22257; RTOP 535-03-01...
