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  • Other Sources  (4)
  • 2000-2004
  • 1990-1994
  • 1985-1989
  • 1980-1984  (4)
  • 1965-1969
  • 1983  (4)
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  • 2000-2004
  • 1990-1994
  • 1985-1989
  • 1980-1984  (4)
  • 1965-1969
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  • 1
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    Heating analysis of bent-nose biconics at high angles of attack using the parabolized Navier-Stokes equations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method based on the Parabolized Navier-Stokes equations is used to calculate the flow field and heat transfer of lifting entry vehicles. The method is based on the Bean and Warming implicit algorithm and uses a new procedure for preventing departure solutions. Calculations are carried out for blunt on-axis and bent biconics, assuming a perfect gas and laminar flow, and compared with available heat transfer, surface pressure and shock shape measurements for a range of Mach numbers and angles of attack. In all calculations presented here, the starting solution is obtained from available inviscid and boundary layer codes. Good agreement with experiment is indicated. Thus, the method provides an accurate and rather inexpensive procedure for calculating three-dimensional flows at supersonic Mach numbers.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 83-1507
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Measuring Small Leak Holes (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Hole sizes deduced from pressure measurements. Measuring apparatus consists of pitot tube attached to water-filled manometer. Compartment tested is pressurized with air. Pitot probe placed at known distance from leak. Dynamic pressure of jet measured at that point and static pressure measured in compartment. Useful in situations in which small leaks are tolerable but large leaks are not.
    Keywords: MECHANICS
    Type: MSC-20113 , NASA Tech Briefs (ISSN 0145-319X); 7; 3; P. 307
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A review of lunar paleointensity data and implications for the origin of lunar magnetism (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A lunar surface field comparable in intensity to the earth's magnetic field, existing from 3.6 to 3.8 AE, is suggested by paleointensity estimation measurements of more than 50 lunar samples by means of the saturation remanence normalization method. The present data differ from previous descriptions of the lunar field's variation with time, in that the oldest samples are among the most weakly magnetized, and the time of extrusion of the Apollo 11 low and high potassium basalts is suggested to have dropped in paleointensity by an order of magnitude. The coincidence of the high field era with the termination of basin forming impacts at the beginning of mare basalt extrusion suggests a common cause, such as the close approach of the moon to the earth at 3.8 AE.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The application of parameter estimation to flight measurements to obtain lateral-directional stability derivatives of an augmented jet-flap STOL airplane (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flight experiments with an augmented jet flap STOL aircraft provided data from which the lateral directional stability and control derivatives were calculated by applying a linear regression parameter estimation procedure. The tests, which were conducted with the jet flaps set at a 65 deg deflection, covered a large range of angles of attack and engine power settings. The effect of changing the angle of the jet thrust vector was also investigated. Test results are compared with stability derivatives that had been predicted. The roll damping derived from the tests was significantly larger than had been predicted, whereas the other derivatives were generally in agreement with the predictions. Results obtained using a maximum likelihood estimation procedure are compared with those from the linear regression solutions.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2033 , A-8977 , NAS 1.60:2033
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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