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  • Aeronautics (General)  (4)
  • Metals and Metallic Materials  (4)
  • 2015-2019
  • 1995-1999
  • 1945-1949  (8)
  • 1947  (8)
  • 1
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    Cooling of Gas Turbines II : Effectiveness of Rim Cooling of Blades (1947)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: No abstract available
    Keywords: Aeronautics (General)
    Type: NACA-RM-E7B11b , NACA-MR-E5I20
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Review of an Investigation of Ceramic Coatings for Metallic Turbine Parts and Other High-temperature Applications (1947)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: No abstract available
    Keywords: Metals and Metallic Materials
    Type: NACA-TN-1186
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Changes Found on Run-In and Scuffed Surfaces of Steel Chrome Plate, and Cast Iron (1947)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A study was made of run-in and scuffed steel, chrome-plate, and cast-iron surfaces. X-ray and electron diffraction techniques, micro-hardness determinations, and microscopy were used. Surface changes varied and were found to include three classes: chemical reaction, hardening, and crystallite-size alteration. The principal chemical reactions were oxidation and carburization.
    Keywords: Metals and Metallic Materials
    Type: NACA-TN-1432 , AD-A801570
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Six-component measurements on a straight and a 35 degree swept-back trapezoidal wing with and without split flaps (1947)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: In accord with me test program (published in reference 7) the wing in question is briefly designated as No. 5. It differs from the rectangular wing discussed in reference 7 by its taper and from the 35O swept-back trapezoidal wing treated in reference 8 by the absence of sweepbaok .
    Keywords: Aeronautics (General)
    Type: NACA-TM-1107
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Scale effect and optimum relations for sea surface planning (1947)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: From the general dimensional and mechanical similarity theory it follows that a condition of steady motion of a given shape\bottom with constant speed on the surface of water is determined by four nondimensional parameters. By considering the various systems of independent parameters which are applied in theory and practice and special tests, there is determined their mutual relations and their suitability as planning characteristics. In studying the scale effect on the basis of the Prnndtl formula for the friction coefficient for a turbulent condition the order of magnitude is given of the error in applying the model data to full scale in the case of a single-step bottom For a bottom of complicated shape it is shown how from the test data of the hydrodynamic characteristics for one speed with various loads, or one load with various speeds, there may be obtained by simple computation with good approximation the hydrodynamic characteristics for a different speed or for a different load. (These considerations may be of use in solving certain problems on the stability of planning.) This permits extrapolating the curve of resistance against speed for large speeds inaccessible in the tank tests or for other loads which were not tested. The data obtained by computation are in good agreement with the test results. Problems regarding the optimum trim angle or the optimum width in the case of planning of a flat plate are considered from the point of view of the minimum resistance for a given load on the water and planning speeds. Formulas and graphs are given for the optimum value of the planning coefficient and the corresponding values of the trim angle and width of the flat plate.
    Keywords: Aeronautics (General)
    Type: NACA-TM-1097 , Central Aero-Hydrodynamical Institute; Report-439
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Investigation of an Experimental Supersonic Axial-Flow Compressor (1947)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: An investigation is in progress at the Langley Laboratory of the NACA to explore the possibilities of axial-flow compressors operating with supersonic velocities relative to the blade rows. The first phase of this investigation, a study of supersonic diffusers, has been reported. The second phase, an analysis of supersonic compressors, has also been reported. Preliminary calculations have shown that very high pressure ratios across a stage, together with somewhat increased mass flows, are possible with compressors which decelerate air through the speed of sound in their rotor blading. These performance characteristics are desirable in compressors for aircraft jet propulsion units, gas turbines, or superchargers. The third phase, presented here, is a preliminary experimental investigation of a supersonic compressor designed to produce a high pressure ratio in a single stage.
    Keywords: Aeronautics (General)
    Type: NACA-RM-L6J01b
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The Crystal Structure at Room Temperature of Six Cast Heat-Resisting Alloys (1947)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: The crystal structures of alloys 61, X-40,X-50, 422-19, 6059, and Vitallium, derived from x-ray diffraction, are discussed. The alloys have been, or are being considered for use in gas turbine applications. The predominant phase was a solid solution of the face centered cubic type of the principal constituent elements.The lattice parameters were found to be between 3.5525 and 3.5662.
    Keywords: Metals and Metallic Materials
    Type: NACA-RM-E7D23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Cyclic Engine Test of Cast Vitallium Turbine Buckets - I (1947)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An investigation was conducted to correlate the engine service performance of cast Vitallium turbine buckets with standard laboratory metallurgical data. Data were obtained from four I-40 turbine wheels of Timken alloy with cast Vitallium buckets. In order to accelerate bucket deterioration, the turbine wheels were subjected to 20-minute cycles consisting of 5 minutes at idle and 15 minutes at rated speed. A bucket broke on the first wheel during cycle 22 after 7 hours and 20 minutes. The broken bucket was replaced and during the third cycle after the replacement a second bucket broke after a total running time of 8 hours and 12 minutes, The first bucket failure on the second wheel occurred during cycle 29 after 9 hours and 28 minutes; no further failure occurred during 66 additional cycles. Total running time on this wheel was 31 hours and 40 minutes. The third wheel was run for 229 cycles (76 hr and 20 min, total running time) without a. failure. The fourth wheel was operated for 105 cycles (35 hr, total running time) without a failure. Examination of the bro?en buckets indicated that the failures were probably due to fatigue, Massive eutectic areas that existed near the trailing edge probably contributed to the low fatigue strength.
    Keywords: Metals and Metallic Materials
    Type: NACA-RM-SE7B07 , NACA-RM-E7B07
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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