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Two Dimensional Tests Of Airfoils Oscillating Near Stall Volume I Summary And Evaluation Of Results
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Book Synopsis Two-dimensional Tests of Airfoils Oscillating Near Stall. Volume I. Summary and Evaluation of Results by : Jaan Liiva
Download or read book Two-dimensional Tests of Airfoils Oscillating Near Stall. Volume I. Summary and Evaluation of Results written by Jaan Liiva and published by . This book was released on 1968 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation into rotor blade dynamic stall was conducted. Two typical airfoils, the NACA 0012 (modified) and the Vertol 23010-1.58, were tested by measuring the differential pressures acting during pitching and translatory oscillations over a range of angles of attack covering the stall regime. There were two main objectives. The first was to determine the influence of stall on the aerodynamic pitching moment of an airfoil executing pitching motions corresponding to the elastic torsional oscillations of a rotor blade. The second was to determine the extent to which time-varying angle of attack could affect the maximum aerodynamic lift that a rotor blade can develop. The cambered profile remained free of negative damping for 3 to 6 degrees beyond the point where the symmetrical section encountered negative damping in the Mach 0.2 to 0.4 range. The cambered section exhibited higher attainable C sub N's than the symmetrical section under all conditions of motion, except for the highest frequency tested at Mach 0.6. (Author).
Book Synopsis Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall. Volume I. Summary and Evaluation of Results by : Lewis Gray
Download or read book Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall. Volume I. Summary and Evaluation of Results written by Lewis Gray and published by . This book was released on 1969 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the results of an experimental investigation of rotor blade dynamic stall. Forces and moments in two-dimensional flow were determined for two thin airfoil sections (NACA 0006 and Vertol 13006-.7) usually considered in advanced helicopter rotor concepts by measuring differential pressure during oscillatory pitch motions. The Mach number, Reynolds number, and angle of attack prevailing in the retreating-blade stall region were investigated up to typical first-torsion mode natural frequencies. Pitch oscillation was shown to increase the angle of attack at which stall occurred, with a corresponding increase in maximum normal force. Hysteresis effects on the pitching moment response produced regions of negative aerodynamic damping in oscillations at mean angles of attack near the steady-flow stall values for all Mach numbers from 0.2 to 0.6. It is shown that dynamic stall effects are strongly related to the reduced frequency parameter. Significant evidence of compressibility effects appears only at Mach numbers higher than 0.4. At lower Mach numbers, the data indicate that the two effects of decreased Mach number and airfoil camber are fully comparable in terms of dynamic stall patterns and increase both the usable angle of attack and the maximum normal force. (Author) 25.
Book Synopsis Two-dimensional Tests of Airfoils Oscillating Near Stall. Volume Ii: Data Report by : Lewis Gray
Download or read book Two-dimensional Tests of Airfoils Oscillating Near Stall. Volume Ii: Data Report written by Lewis Gray and published by . This book was released on 1968 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a discussion of the test facility, models, and data gathering and reduction system used in the tests of oscillating airfoils. It also contains the actual computer data that resulted from the wind tunnel tests of the airfoils. A set of tables provides a quick cross-reference between the various test factors and the page on which the data appear. (Author).
Book Synopsis Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall by : Lewis Gray
Download or read book Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall written by Lewis Gray and published by . This book was released on 1969 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the results of an experimental investigation of rotor blade dynamic stall. Forces and moments in two-dimensional flow were determined for two thin airfoil sections (NACA 0006 and Vertol 13006-.7) usually considered in advanced helicopter rotor concepts by measuring differential pressure during oscillatory pitch motions. The Mach number, Reynolds number, and angle of attack prevailing in the retreating-blade stall region were investigated up to typical first-torsion mode natural frequencies. Pitch oscillation was shown to increase the angle of attack at which stall occurred, with a corresponding increase in maximum normal force. Hysteresis effects on the pitching moment response produced regions of negative aerodynamic damping in oscillations at mean angles of attack near the steady-flow stall values for all Mach numbers from 0.2 to 0.6. It is shown that dynamic stall effects are strongly related to the reduced frequency parameter. Significant evidence of compressibility effects appears only at Mach numbers higher than 0.4. At lower Mach numbers, the data indicate that the two effects of decreased Mach number and airfoil camber are fully comparable in terms of dynamic stall patterns and increase both the usable angle of attack and the maximum normal force.
Book Synopsis Two-dimensional Tests of Airfoils Oscillating Near Stall: Data report by :
Download or read book Two-dimensional Tests of Airfoils Oscillating Near Stall: Data report written by and published by . This book was released on 1968 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind Tunnel Investigation of Airfoils Oscillating in Reverse Flow by : Lewis Gray
Download or read book Wind Tunnel Investigation of Airfoils Oscillating in Reverse Flow written by Lewis Gray and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall. Volume Ii. Data Report by : Lewis Gray
Download or read book Wind Tunnel Tests of Thin Airfoils Oscillating Near Stall. Volume Ii. Data Report written by Lewis Gray and published by . This book was released on 1969 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the actual computer data that resulted from the two-dimensional tests of thin airfoils oscillating near stall. An introduction provides a general background, and a set of tables forms an index to specific data. More than 200 pages of computer data are included.
Book Synopsis NASA Technical Paper by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1978 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1978 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the American Helicopter Society by : American Helicopter Society
Download or read book Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 2001 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog, United States Public Documents by : United States. Superintendent of Documents
Download or read book Monthly Catalog, United States Public Documents written by United States. Superintendent of Documents and published by . This book was released on 1968 with total page 1716 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Download or read book NASA Technical Note written by and published by . This book was released on 1972 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1968-07 with total page 1150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1966 with total page 1320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications, Cumulative Index by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications, Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1970 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Propulsion Systems Technology and Design by : Gordon C. Oates
Download or read book Aircraft Propulsion Systems Technology and Design written by Gordon C. Oates and published by AIAA. This book was released on 1989 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
