Last edited by Kagara
Wednesday, April 22, 2020 | History

3 edition of Low-speed wind-tunnel tests of single- and counter-rotation propellers found in the catalog.

Low-speed wind-tunnel tests of single- and counter-rotation propellers

Low-speed wind-tunnel tests of single- and counter-rotation propellers

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Propellers, Aerial -- Testing.,
  • Contrarotating propellers.,
  • Propeller blades.,
  • Turboprop engines.,
  • Wind tunnel tests.

  • Edition Notes

    StatementDana Morris Dunham, Garl L. Gentry, Jr., and Paul L. Coe, Jr.
    SeriesNASA technical memorandum -- 87656.
    ContributionsGentry, Garl L., Coe, Paul L., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16152800M


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Low-speed wind-tunnel tests of single- and counter-rotation propellers Download PDF EPUB FB2

Get this from a library. Low-speed wind-tunnel tests of single- and counter-rotation propellers. [Dana Morris Dunham; Garl L Gentry; Paul L Coe; Langley Research Center.].

A low-speed (Mach 0 to ) wind-tunnel investigation was conducted to determine the basic performance, force and moment characteristics, and flow-fieldvelocities of single-and counter-rotationpropellers. The results for advance ratios from to show that the maximum efficiency for the eight-blade single-rotationpropeller.

LOW SPEED PROPELLER TESTS As part of a program to evaluate the cap- ability of current G.A. propeller aerodynamic and acoustic analytical prediction methods, a wind tunnel test of several G.A. propeller models were conducted in the NASA Lewis by foot wind tunnel.

A photograph of one of these meter (5 it> diameter mod. Tests of ft. diameter, eight-blade, single - and dual - rotating propellers were conducted in ft propeller research tunnel. Propellers were mounted at front end of a streamline body in.

Wind-tunnel tests of dual-rotating propellers with systematic differences in number of blades, blade setting, and rotational speed of front and rear propellers / (Langley Field, VA: Langley Memorial Aeronautical Laboratory, ), by W. Gray, United States. National Advisory Committee for Aeronautics, and Langley Aeronautical Laboratory.

The model has to be further verified with high-speed wind tunnel test data of highly loaded propellers, which was not found in the public domain.

In Part II, the novel CRP model is used to produce a performance model of a geared open rotor (GOR) engine with a 10% clipped propeller designed for a PAX and NM by: 4. Introduction. In light of the current debate on climate change and the oil price peak infuel efficiency and low CO 2 emissions are increasingly important topics for the air transport industry.

Aircraft noise also is an increasingly important factor for the future development of air transport, as airport expansion projects are impeded predominantly due to objections regarding the Cited by: American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Full text of "NASA Technical Reports Server (NTRS) Advanced Propfan Engine Technology (APET) definition study, single and counter-rotation gearbox/pitch change mechanism design" See other formats.

Tests were also conducted in the NASA GRC 8’ × 6’ supersonic (high-speed) wind tunnel (SWT) to obtain near-field sideline acoustic data at simulated cruise conditions with freestream Mach numbers ranging from to Simultaneous acoustic measurements were made using 17 inline sensors mounted on an overhead by: 1.

Full text of "NASA Technical Reports Server (NTRS) Bibliography of Lewis Research Center technical publications announced in " See other formats. Wind Noise Caused by the Side-Mirror and A-Pillar of a Generic Vehicle Model Experimental and Numerical Studies of the Low Speed Wind Tunnel DNW-NWB's Open Test Section Towards an Aeroacoustic Facility.

Nearfield Unsteady Pressures at Cruise Mach Numbers for a Model Scale Counter-rotation Open Rotor. Stephens. The object of this book is to provide engineers and researchers in the wind power industry, national laboratories, and universities with comprehensive, up-todate, and advanced design techniques and practical approaches.

The topics addressed in this book involve the major concerns in wind power generation and wind turbine design. The starting point in the formulation of most acoustic problems is the acoustic wave equation. Those most widely used, the classical and convected wave equations, have significant restrictions, i.e., apply only to linear, nondissipative sound waves in a steady homogeneous medium at rest or in uniform by: Researchers at NASA's Langley Research Center in Hampton, Va., tested the second XB prototype aircraft in Langley's historic full-scale wind tunnel in the spring ofand the flight tests are intended in part to validate the results of those wind tunnel tests.

Low speed wind tunnel tests at the Lockheed-California Company in confirmed these analytical resul ts by showing induced drag 28 OBLIQUE WING CONVENTIONAL % CHANGE TOGW - LB, -7 DOC - q:/ST MI t -5 THRUST / ENG - LB 91,IV \0 BLOCK FUEL - LB 78, 83, -7 NO I SE FOOTPR I NT AREA, 90 5/5(1).

Wind Tunnel Photograph.1 Left photo is free end, and right photo is motor and fan part of the experiment wind tunnel This wind tunnel shown in Photograph.1 was one of the biggest three low speed wind tunnels in the George Begg Building wind tunnel laboratory of the University of Manchester which could operate up to 27 m/s of wind speed without.

Dornier Do Pfeil. From Wikipedia, the free encyclopedia. The Dornier Do Pfeil (“Arrow”) was a World War II heavy fighter built by the Dornier company. The two-seater trainer version was called Ameisenbär (“anteater”). The Pfeil‘s performance was much better than other twin-engine designs due to its unique push-pull configuration and the lower aerodynamic drag of the in-line.

The critical condition for slipstream rotation is for high power at low speed. see fig counter-rotating propellers, of course, obviate this factor." In the Longitudinal Stability chapters they say something about difficulties trying to treat them analytically.

XII E - AEWT (Aeroacoustic Wind Tunnel), Industrial Research Project, funded by FCT, transfer of aeroacoustic wind tunnel, maximum speed 60 ms, and open m test section in anechoic chamber, from RAE (Royal Aircraft Establishment) / DRA (Defence Research Agency) / DTEA (Defence Technology and Evaluation Agency) in Farnborougl Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online.

Easily share your publications and get them in front of Issuu’s. CFD simulations and experimental tests were adopted to the performance of the model counter-rotating type HATT.

The experimental data provides an evidence of validation of the CFD model. Further optimization of the blade profiles was also carried out based on the CFD results. Low-speed wind-tunnel tests of single- and counter-rotation propellers. Aircraft Design ()[1] - Free ebook download as PDF File .pdf), Text File .txt) or read book online for free.5/5(2).

Bill Gunston - The Cambridge Aerospace Dictionary (Cambridge Aerospace Series) () код для вставки. Low-speed wind-tunnel tests of single- and counter-rotation propellers. NASA Technical Reports Server (NTRS) Dunham, D. M.; Gentry, G. L., Jr.; Coe, P. L., Jr. A low-speed (Mach 0 to ) wind-tunnel investigation was conducted to determine the basic performance, force and moment characteristics, and flow-field velocities of single- and counter-rotation propellers.

I have been trying to figure out if there is actually truth to the widely reported statements of reduced induced drag thanks to counter-rotation of the props.

In the book "Radical wind tunnels" the assertion is made that wind tunnel tests showed little or no difference with models having either sense of. The wind tunnel first used for testing is an Aerolab educational wind tunnel, located at the University of Florida which has a test section size of mm x mm x mm (12”x12”x18”).

To reduce wall effect from the test section, the diameter was chosen to be mm (”), which is approximately half the size of the test section. PA Systems. Table of Contents. General Counter-rotation of the propellers provides balanced thrust during takeoff and climb and eliminates the critical engine factor in single-engine flight.

Low Speed Wind Tunnel Tests on a Buccaneer MK With Blown LE Slats, Flaps and Ailerons. Uploaded by. If a low speed generator is used, it can eliminate the need for a gearbox and have a great effect on the layout of the turbine as a whole.

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