Wind Tunnels of NASAScientific and Technical Information Branch, National Aeronautics and Space Administration, 1981 - 154 страница |
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8-foot high-speed 80-foot tunnel aero aerodynamicists aeronautical air velocity aircraft designers airflow airfoil airspeeds airstream Ames atmosphere bomber boundary layer compressor craft cruise cryogenic diameter drag electric energy engine feet per second fighter flight tests flying fuselage glider heat heater helium high Reynolds numbers high-pressure high-speed tunnel hypersonic Laboratory laminar flow laser launch vehicles Lewis lift lift forces Ludwieg tube Mach numbers missiles NACA wind tunnel NASA National Physical Laboratory National Transonic Facility nozzle percent Photo pilot plane pressure tunnel problems propeller propulsion range ratio reentry rocket shock tube shock wave simulate sonic Space Shuttle spacecraft speeds spin subsonic supercritical wing supersonic transports supersonic tunnel supersonic wind tunnel surface tank temperatures test gas test section tion transonic tunnel operating tunnel walls turbulence Unitary Plan upstream V/STOL variable density tunnel vertical VTOL wind tunnel design wind tunnel tests winglets Wrights
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Страница 5 - Flyer has been rebuilt and is now on display at the National Air and Space Museum in Washington, DC The rebuilt Wright Flyer in the National Air and 'Space Museum.
Страница 11 - Aeronautics to supervise and direct the scientific study of the problems of flight, with a view to their practical solution...
Страница 20 - The only people so far who have been able to get at something like accurate results from wind tunnel experiments are the workers at the experimental station at Langley Field.
Страница 143 - Facility typifies the modern trend toward tunnel/computer symbiosis. Four computers handle the functions of data acquisition and display, data base management, process monitoring and communication, and tunnel and model control. Tunnel control means just that. The various aspects of tunnel operation are monitored continuously and automatically. When these parameters stray too far from the norm, the computer sounds the alarm and takes appropriate remedial action, even shutting the tunnel down when...
Страница 3 - The most important general inference from these experiments, as a whole, is that, so far as the mere power to sustain heavy bodies in the air by mechanical flight goes, such mechanical flight is possible with engines we now possess...
Страница 4 - Having set out with absolute faith in the existing scientific data, we were driven to doubt one thing after another, till finally, after two years of experiment, we cast it all aside, and decided to rely entirely upon our own investigations.
Страница 11 - ... the increasing needs of the very rapid development already under way, stimulated by the unusual conditions existing in Europe, the facilities and technical assistance recommended are essential. While the needs at present are principally those which have an important bearing on military preparedness, the committee is of the opinion that aeronautics has made such rapid strides that when the war is over there will be found available classes of aircraft and a trained personnel for their operation,...
Страница 66 - Drive motors 11 x 11-foot transonic test section Office building By-pass piping to an air injector ' Flow diversion valve 9 x 7-foot supersonic test section The Ames Unitary Plan wind tunnel actually consisted of three separate test sections fed by a centralized power source. One test section was transonic; the other two were supersonic. A 1/6-scaIe model in the Ames 11 -foot Unitary Plan transonic tunnel.
Страница 13 - Start of turbulence vV. 1 Wherever fluids flow — in pipes, through an automobile radiator, or across an aircraft wing — engineers use the Reynolds number to calculate flow characteristics. Osborne Reynolds had demonstrated in 1883 that the motion of a fluid may be either laminar or turbulent, and that the change from one to the other may be abrupt. In Reynolds ' fundamental experiment, the flow of fluid through tube A- A was made visible by injecting dye into the bellmouthed tube as a thin filament...
Страница 111 - ... increasing performance in the subsonic speed region in which jetliners were already operating. This became clear shortly after the 1972 NASA conference, when design teams in the aircraft industry sank their teeth into the idea and started feeding equations and aerodynamic data into electronic computers: "Don't use the supercritical wing to increase cruise speed (which had been the goal all along); rather, hold current cruise speeds at Mach 0.8 and increase wing thickness using the supercritical...