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Includes sound generation, transmission, and attenua
AND SPACE POLICY
3373 Includes NASA appropriation hearings; aviation law; space law and policy; international law; international cooperation; and patent policy.
For noise pollution see 45 Environment Pollution.
72 ATOMIC AND MOLECULAR PHYSICS 3355
Includes atomic structure, electron properties, and molecular spectra.
73 NUCLEAR AND HIGH-ENERGY PHYSICS
3358 Includes elementary and nuclear particles; and reactor theory.
For space radiation see 93 Space Radiation.
85 URBAN TECHNOLOGY AND
3374 Includes applications of space technology to urban problems; technology transfer; technology assessment; and surface and mass transportation.
For related information see 03 Air Transportation and Safety, 16 Space Transportation, and 44 Energy Production and Conversion.
Includes space sciences (general); astronomy; as
trophysics; lunar and planetary exploration; solar physics; 75 PLASMA PHYSICS
and space radiation.
For related information see also Geosciences. Includes magnetohydrodynamics and plasma fusion. For ionospheric plasmas see 46 Geophysics. For
88 SPACE SCIENCES (GENERAL)
3374 space plasmas see 90 Astrophysics.
3374 76 SOLID-STATE PHYSICS
3364 Includes superconductivity.
Includes radio, gamma-ray, and infrared astronomy; For related information see also 33 Electronics and
and astrometry. Electrical Engineering and 36 Lasers and Masers.
3375 TI THERMODYNAMICS AND
Includes cosmology; celestial mechanics; space plasSTATISTICAL PHYSICS
mas; and interstellar and interplanetary gases and dust.
For related information see also 75 Plasma Physics. Includes quantum mechanics; theoretical physics; and Bose and Fermi statistics.
91 LUNAR AND PLANETARY For related information see also 25 Inorganic and Phys
3377 ical Chemistry and 34 Fluid Mechanics and Heat Transfer.
Includes planetology; and manned and unmanned
flights. SOCIAL SCIENCES
For spacecraft design or space stations see 18 SpaceIncludes social sciences (general); administration and
craft Design, Testing and Performance. management; documentation and information science; economics and cost analysis; law, political science, and
92 SOLAR PHYSICS
3377 space policy; and urban technology and transportation.
Includes solar activity, solar flares, solar radiation and
sunspots. 80 SOCIAL SCIENCES (GENERAL)
For related information see 93 Space Radiation. Includes educational matters.
93 SPACE RADIATION
3377 81 ADMINISTRATION AND
Includes cosmic radiation; and inner and outer earth's MANAGEMENT
radiation belts. Includes management planning and research.
For biological effects of radiation see 52 Aerospace
Medicine. For theory see 73 Nuclear and High-Energy 82 DOCUMENTATION AND
Physics. INFORMATION SCIENCE
3372 Includes information management; information stor
GENERAL age and retrieval technology; technical writing; graphic arts; and micrography.
Includes aeronautical, astronautical, and space sciFor computer documentation see 61 Computer Pro
ence related histories, biographies, and pertinent reports gramming and Software.
too broad for categorization; histories or broad overviews
of NASA programs. 83 ECONOMICS AND COST ANALYSIS
N.A. Includes cost effectiveness studies.
3378 Note: N.A. means that no abstracts were assigned to this category for this issue.
CONTRACT OR GRANT
The second Control Of Flexible Structures Flight Experiment
VOLUME 27 NUMBER 23 / DECEMBER 8, 1989
Scientific and Technical Aerospace Reports
A Semimonthly Publication of the National Aeronautics and Space Administration
01 AERONAUTICS (GENERAL)
N89-28485# Deutsche Forschungs- und Versuchsanstalt fuer Luft- und Raumfahrt, Cologne (Germany, F.R.). (ACTIVITIES REPORT IN AEROSPACE RESEARCH IN GERMANY, F.R.) Annual Report, 1987 Sep. 1988 101 p in GERMAN Previously announced in IAA as A89-32775 Report contains color illustrations (ISSN-0070-3966; ETN-89-94382) Avail: NTIS HC A06/MF A01
The activities of the FRG aerospace research organization DFVLR for 1987 are reported. In the research field of aeronautics, investigations were performed on Compas (a planning and decision aid for air traffic controllers) and on a delta wing (a contribution to the International Vortex Flow Experiment). Space-related activities were the German Front Experiment 1987 (an example for the mesoscale probing of the atmosphere) and wind tunnel testing of reentry bodies in the hypersonic range. In the field of energy technology, renewable energy sources for BadenWuerttemberg were investigated. Photographs, drawings, and diagrams are provided, and an English summary is given for each section.
C. P. Butterfield Jun. 1989
Presented at the European Wind Energy Conference and Exhibition, Glasgow, Scotland, 10 Jul. 1989 (Contract DE-ACO2-83CH-10093) (DE89-009443; SERI/TP-217-3505; CONF-890717-2) Avail: NTIS HC A02/MF A01
The objective of this comprehensive research program was to study the effects of Horizontal Axis Wind Turbine (HAWT) blade rotation on aerodynamic behavior below, near, and beyond stall. The flow angle sensor used to measure Angle Of Attack (AOA) is described along with how the sensor was calibrated, and results are given of pressure integrations on the blade. Aerodynamic, load, flow visualization, and inflow measurements were made on a 10-m, three-bladed, downwind HAWT. A video camera was mounted on the rotor to record video images of tufts attached to the low pressure side of a constant-chord, zero-twist blade. Load measurements were made using strain gages mounted every 10 percent of the blade's span. Pressure taps were located at 32 chordwise positions and revealed pressure distributions comparable with wind tunnel data. Inflow was measured using a vertical plane array of eight propvane and five triaxial (U-V-W) prop-type anemometers located 10 m upwind in the predominant wind direction. Results show evidence of stall hysteresis and unsteadiness at high AOA. Correlations with analytical predictions and wind tunnel tests show good agreement at low AOA and poor agreement at high AOA.
Includes aerodynamics of bodies, combinations, wings, rotors, and control surfaces; and internal flow in ducts and turbomachinery.
For related information see also 34 Fluid Mechanics and Heat Transfer.
N89-28486* National Aeronautics and Space Administration.
Static and dynamic force tests of a generic fighter configuration designed for sustained supersonic flight were conducted in the Langley 30- by 60-foot tunnel. The baseline configuration had a 65 deg arrow wing, twin wing mounted vertical tails and a canard. Results showed that control was available up to C sub L,max (maximum lift coefficient) from aerodynamic controls about all axes but control in the pitch and yaw axes decreased rapidly in the post-stall angle-of-attack region. The baseline configuration showed stable lateral-directional characteristics at low angles of attack but directional stability occurred near alpha 25 deg as the wing shielded the vertical tails. The configuration showed positive effective dihedral throughout the test angle-of-attack range. Forced oscillation tests indicated that the baseline configuration had stable damping characteristics about the lateral-directional axes. Author
N89-28488# General Dynamics Corp., Fort Worth, TX. SMALL SCALE MODEL TESTS IN SMALL WIND AND WATER TUNNELS AT HIGH INCIDENCE AND PITCH RATES. VOLUME 1: TEST PROGRAM AND DISCUSSION OF RESULTS Final Report, Sep. 1985 - Sep. 1988 Atlee M. Cunningham, Jr., Todd Bushlow, John R. Mercer, Tim A. Wilson, and Steve N. Schwoerke Apr. 1989 144 p (Contract N00014-85-C-0419) (AD-A208647) Avail: NTIS HC A07/MF A01 CSCL 01/1
Volume 1 presents the test program, correlations with other data, and discussions of the specific objectives of this investigation. in general it was shown that the small scale wind tunnel and water tunnel test techniques do provide reasonable dynamic force and moment data for a wide variety of planforms and conditions. The force testing of small-scale models in either a small wind tunnel or a water tunnel was investigated as an inexpensive and quick means to obtain meaningful dynamic force and moment data representative of rapidly maneuvering full-scale aircraft. Force tests of flat-plate semi-span models were conducted in the General Dynamics Aerodynamic Development Facility (ADF) which is a small 14x14 in. low speed wind tunnel. Oscillatory model motions up to 48 deg (peak to peak) amplitude were tested at frequencies of 1 to 3 Hz. Force tests of flat and three-dimensional full span models were conducted in the General Dynamics Hydroflow Facility (HFF) which is a horizontal flow water tunnel with a 24x24 in. test section. Pitch/pulse model motions were tested for conditions similar to those tested in the ADF.
N89-28487# Midwest Research Inst., Golden, CO. Solar Energy
N89-28489# Aeronautical Research Labs., Melbourne
flow is not separated. It is also demonstrated that the present 3D code gives results in agreement with experimental data and it can be used for 3D flutter simulation programs in a similar manner to 2D programs.
L. D. MacLaren Feb. 1989 6 p
The vortex flow patterns over thin delta wings were photographed during experiments in a vertical water tunnel making use of appropriate flow visualization techniques. The flow geometry for these wings was also calculated using the VORSBA vortex flow computer program. A comparison is made between the calculated and experimental results and discrepancies between them are discussed.
N89-28493*# California Polytechnic State Univ., San Luis
An examination of the potential flow computer code VSAERO to model leading edge separation over a delta wing is examined. Recent improvements to the code suggest that it may be capable of predicting pressure coefficients on the body. Investigation showed that although that code does predict the vortex roll-up, the pressure coefficients have significant error. The program is currently unsatisfactory, but with some additional development it may become a useful tool for this application.
N89-28490# Air Force Inst. of Tech., Wright-Patterson AFB,
This research used glider flight tests and optimized glider simulations to evaluate the aerodynamics of ground effect and to determine the optimum flight profile for maximum gliding range in gliders. A series of 122 sorties were flown in the Grob G-103 Twin ll and the Let L-13 Blanik gliders on a specially designed very low altitude speed course. Radar tracking data were used to determine the glider position and velocity, and a 3 degree of freedom glider performance simulation was used to determine the glider parasite and induced drag coefficients in ground effect. Lifting line derived predictions of ground effect induced drag reduction developed by Dr. Sighard Hoerner were found to be accurate at altitudes above 20 percent wingspan but were up to 16 percent too optimistic at low altitudes. A revised prediction of ground effect induced drag reduction was developed based on the flight test data, and this revised prediction was used along with a turbulent boundary layer wind model in two optimization algorithms to develop the optimum flight profiles for maximum range gliding flight.
N89-28494# Institut Franco-Allemand de Recherches, Saint-Louis
In FRENCH Original contains color illustrations (ISL-R-123/87; ETN-89-94856) Avail: NTIS HC A03/MF A01
The use of horseshoe vortices on the wing and of a turbulent network for the wake, permitted treatment in three dimensions of the case of a thin wing for steady flow and unsteady flow (incident wing with upstream vortex). For steady flow and large spans the calculated lift is close to the two dimensional value. For the unsteady case the variations in lift along the path of the vortex are described.
N89-28491# Air Force Geophysics Lab., Hanscom AFB, MA. THE FIRST LARGE BALLOON LAUNCH FROM ANTARCTICA Final Scientific Report John Ground, Kenneth Dallas, Ralph Cowie, and Willard F. Thorn 26 Sep. 1988 103 p (AD-A207735; AFGL-TR-88-0265; AFGL-ERP-1015) Avail: NTIS HC A06/MF A01 CSCL 01/3
This collection of five papers discusses the many practical problems, logistics, metrological planning, flight history and recovery operations for the first very large (11.6M cu ft) stratospheric balloon launched from Antarctica. The on-board Gamma Ray Advanced Detector (GRAD) was flown successfully to detect gamma ray emissions from Supernova 1987A. The 2500-1b payload was recovered from a 12,500-ft plateau by LC-130 aircraft. The instrumentation for command-control and telemetry, payload integration and testing, and the telemetry station installed aboard an LC-130 aircraft are described. An overview of the performance of the ARGOS satellite tracking and data-recovery system on this flight is included.
N89-28495# Institut Franco-Allemand de Recherches, Saint-Louis (France) PROFILE-VORTEX INTERACTIONS (INTERACTION PROFIL/TOURBILLON) J. Haertig, Ch. Johe, and M. Schaffar 3 Nov. 1987 49 p in FRENCH (Contract DRET-85-031) (ISL-R-125/87; ETN-89-94858) Avail: NTIS HC A03/MF A01
The time evolution of the lift coefficient of a profile exposed to incident vortices is calculated by a perfect fluid two dimensional method and compared to experimental results obtained in a hydrodynamic channel. The unsteady turbulent field is analyzed using laser anemometry. The results are in good agreement with the theoretical model adopted, except for the case when the vortex path is too close to the profile.
N89-28492# National Aerospace Lab., Tokyo (Japan). Structural
Unsteady Navier-Stokes calculations around an airfoil/wing are demonstrated. 2D transonic flutter simulations are performed about the NACA 64A010 airfoil using not only a diagonal form of a Beam-Warming scheme but also a non-diagonal form. The effects of time accuracy of the algorithms on the flutter boundaries are checked by comparing two results. 3D unsteady computations around an oscillating wing in elastic motions are also carried out and the obtained results are compared with experimental data. It is found that the diagonal form of a Beam-Warming scheme is efficient in predicting the flutter boundaries of airfoils where the
N89-28496# National Aeronautical Lab., Bangalore (India).
An overview is given of the computational requirement for solving CFD problems. Also described are two examples, typical of two different types of approximation of Navier-Stokes equations, carried out on a Supercomputer. The first problem deals with the full potential transonic flow computations around a wing in a body fitted coordinate system, while the second deals with vortex flow computation on a low aspect ratio wing based on Euler equations using finite volume and Runge-Kutta time stepping approaches.