ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (870)
  • Aircraft Propulsion and Power
  • 1955-1959  (876)
  • 1958  (876)
Collection
Publisher
Years
  • 1955-1959  (876)
Year
  • 1
    Publication Date: 2019-08-16
    Description: A lightweight turbine rotor assembly was devised, and components were evaluated in a full-scale jet engine. Thin sheet-metal airfoils were brazed to radial fingers that were an integral part of a number of thin disks composing the turbine rotor. Passages were provided between the disks and in the blades for air cooling. The computed weight of the assembly was 50 percent less than that of a similar turbine of normal construction used in a conventional turbojet engine. Two configurations of sheet-metal test blades simulating the manner of attachment were fabricated and tested in a turbojet engine at rated speed and temperature. After 8-1/2 hours of operation pieces broke loose from the tip sections of the better blades. Severe cracking produced by vibration was determined as the cause of failure. Several methods of overcoming the vibration problem are suggested.
    Keywords: Aircraft Propulsion and Power
    Type: NASA-MEMO-10-5-58E
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2019-07-12
    Description: The performance and operational characteristics of two afterburner configurations for the Iroquois turbojet engine were evaluated in an altitude test chamber over a range of afterburner equivalence ratios at afterburner-inlet pressures from 733 to 3186 pounds per square foot absolute. These conditions correspond to an altitude range from 38,700 to 66,800 feet at a flight Mach number of 1.5. The only difference between the two afterburner configurations was in the pattern of afterburner fuel injection. At an afterburner-inlet pressure of approximately 3100 pounds per square foot absolute, corresponding to an altitude of 38,700 feet and a_ flight Mach number of 1.5, the combustion efficiency of both configurations reached peak values of 0.80 to 0.85 at equivalence ratios of 0.35 to 0.40. However, further reduction in the afterburner-inlet pressure severely affected combustion efficiency. For example, at an afterburner inlet pressure level of 700 to 1000 pounds per square foot absolute, the efficiency for both configurations was 0.20 to 0.40.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE58G01
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2019-07-11
    Description: A program was conducted in an altitude facility at the NACA Lewis laboratory to investigate the effects of rapid inlet pressure oscillations on the operation of a current turbo jet engine. These pressure oscillations were approximately sinusoidal in form and were generated to cover a frequency range of 2 to 75 cycles per second and an amplitude range of 10 to 70 percent of the free-stream total pressure. As the oscillation progressed through the compressor, the amplitude was attenuated considerably and a relatively large phase shift (lag) occurred. Engine stall limits obtained during pressure oscillations differed from quasi-steady-state stall limits as defined by over-all compressor pressure ratio.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E58A03
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2019-06-28
    Description: Average spanwise blade temperatures and cooling-air pressure losses through a small (1.4-in, span, 0.7-in, chord) air-cooled turbine blade were calculated and are compared with experimental nonrotating cascade data. Two methods of calculating the blade spanwise metal temperature distributions are presented. The method which considered the effect of the length-to-diameter ratio of the coolant passage on the blade-to-coolant heat-transfer coefficient and assumed constant coolant properties based on the coolant bulk temperature gave the best agreement with experimental data. The agreement obtained was within 3 percent at the midspan and tip regions of the blade. At the root region of the blade, the agreement was within 3 percent for coolant flows within the turbulent flow regime and within 10 percent for coolant flows in the laminar regime. The calculated and measured cooling-air pressure losses through the blade agreed within 5 percent. Calculated spanwise blade temperatures for assumed turboprop engine operating conditions of 2000 F turbine-inlet gas temperature and flight conditions of 300 knots at a 30,000-foot altitude agreed well with those obtained by the extrapolation of correlated experimental data of a static cascade investigation of these blades.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E58E20
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2019-06-27
    Description: Two short turbojet combustors designed for use with vaporized hydrocarbon fuels were tested in a one-quarter annular duct. The experimental combustors consisted of many small "swirl-can" combustor elements manifolded together. This design approach allowed the secondary mixing zone to be considerably reduced over that of conventional combustors. The over-all combustion lengths, for the two configurations were 13.5 and 11.0 inches, approximately one-half the length of the shortest conventional combustors. These short combustors did not provide combustion efficiencies as high as those for conventional combustors at low pressures. However, over the range of combustor-inlet total-pressures expected in aircraft capable of flight at Mach numbers of 2.5 and above, these short combustors gave very high efficiencies. A combustion efficiency of 97 percent was obtained at a combustor-inlet total-pressure of 25.0 inches of mercury absolute, reference velocity of 120 feet per second, and inlet-air total temperature of 1160 deg R. By proportioning the fuel flow between the manifold rows of can combustor elements, control of the combustor-outlet radial total-temperature profile was demonstrated. Combustor totalpressure loss varied from 0.75 percent of the inlet total pressure at isothermal conditions and a reference velocity of 75 feet per second to 5.5 percent at a total-temperature ratio of 1.8 and a reference velocity of 180 feet per second.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E57J03
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2019-06-27
    Description: This analysis investigates the application of gas turbine engines at a cruise Mach number of 4.
    Keywords: Aircraft Propulsion and Power
    Type: NASA-TM-X-60935 , NACA-C-8548
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 1-4 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Synthetic Rubber Products for Protection against CorrosionIn the chemical and similar industries reaction vessels, pipe lines etc. are covered preferably by genuine or synthetic high polymers. The methods being used nowadays to achieve protection against corrosion are very numerous. The covers are made of buna, perbunan, neoprene, butyl rubber, hypalon and hycar. Covers of these materials can be vulcanized. They are resistant to sulfuric acid, acetic acid, potassium hydroxide, chlorine etc. The connection between metal and cover must be totally homogeneous. Otherwise serious interruptions of work might occur. The synthetic high polymers will have to be applied according to certain directions. The techniques of mixing and working and vulcanization are determining the quality of the covers.There are the brass, Dartex and Desmodur methods as well as the silicone covers and the hypalon cermections.Being vulcanised the densisity of the covers is tested by means of an inductive machine. The testing voltage amounts to 2000 volts corresponding to a spark gap of 20 mm.
    Notes: In der chemischen und den verwandten Industrieen werden Reaktionsgefäße, Rohrleitungen und dgl. vorzugsweise mit natürlichen oder synthetischen Hochpolymeren belegt. Die Verfahren, die beute als Korrosionsschutz angewendet werden, sind sehr mannigfaltig. Solche Schutzbeläge werden hergestellt:Aus Buna, Perbunan, Neoprene, Butylkautschuk, Siliconkautschuk, Hypalon, Hycar.Diese Beläge sind vulkanisierbar und beständig gegen:Schwefelsäure, Salzsäure, Flußsäure, Essigsäure, Kalilauge, Chlor usw.Die Verbindung zwischen Metall und Schutzbelag muß vollständig homogen sein, da sonst im Betrieb erhebliche Störungen auftreten können. Die synthetischen Hochpolymere müssen nach ganz bestimmten Vorschriften der Verarbeitung eingesetzt werden. Die Technik der Mischungen, die Verarbeitung und schließlich die Vulkanisation sind für die Güte der Beläge ausschlaggebend.Man kennt das Messingverfahren, das Dartex-Verfahren, das Desmodur-Verfahren, die Siliconbeläge und die Hypalon-Bindungen.Die fertigen Beläge werden nach der Vulkanisation mit einem Induktionsapparat auf Dichtigkeit geprüfl. Die Prüfung erfolgt bei 2000 V-Spannung, die etwa einer Funkenstrecke von 20 min entspricht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 65-68 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 73-75 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: On the Inhibition of the Corrosion of Buried IronThere is a report on some laboratory experiments on the inhibition of the corrosion of buried iron. The results are explained by means of the influences of the physical properties of the soil upon the suppression of the iron corrosion by the inhibitors Na2CrO4, NaNO2 and sodium benzoate.The results allow to recommend the application of inhibitors for uncovered ironpipes.
    Notes: Es wird über Laboratoriumsversuche über die Inhibition der Eisenkorrosion im Boden berichtet. Die Versuchsergebnisse werden gemeinsam mit den physikalischen Eigenschaften des Bodens bezüglich der Unterbindung der Eisenkorrosion im Boden durch die Inhibitoren: Na2CrO4, NaNO2 und Na-benzoat ausgewertet. Auf Grund dieser Ergebnisse wird eine Empfehlung für die Verwendung von Inhibitoren für den Korrosionsschutz von blanken Eisenrohren im Erdreich gegeben.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 87-96 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...