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Preliminary investigation of the control of a gas-turbine engine for a helicopter / Richard P. Krebs

Description: An analog investigation of the power plant for a gas-turbine powered helicopter indicates that currently proposed turbine-propeller engine controls are satisfactory for helicopter application. Power increases from one-half to full rated at altitudes from sea level to 15,000 feet could be made in less than 4 seconds with either the rotor or propellers absorbing the engine power.
Date: September 11, 1951
Creator: Krebs, Richard P
Item Type: Report
Partner: UNT Libraries Government Documents Department

Internal flow and burning characteristics of 16-inch ram jet operating in a free jet at Mach numbers of 1.35 and 1.73

Description: The effects of mass-flow ratio on the additive drag and normal-shock position of a single oblique-shock diffuser are presented. Also evaluated is the variation with operating condition of the velocity distribution at the combustion-chamber inlet. A comparison with connected-pipe data is included. Burner performance with a corrugated gutter-grid flame holder is discussed. It is shown that the total-pressure drop across the combustion chamber can be predicted with reasonable accuracy from the computed flame holder and combustion momentum pressure losses.
Date: May 21, 1951
Creator: Perchonok, Eugene & Farley, John M
Item Type: Report
Partner: UNT Libraries Government Documents Department

Preliminary investigation of heat transfer to water flowing in an electrically heated Inconel tube

Description: A heat-transfer investigation was conducted with water flowing in an electrically heated Inconel tube with an inside diameter of 0.204 inch and a length-diameter ratio of 50 for ranges of Reynolds number up to 100,000 and of entrance pressure up to 200 inches of mercury gage. Correlation of average heat-transfer coefficients was obtained by use of the familiar Nusselt relation, wherein the physical properties of water were evaluated at an average bulk temperature. For conditions in which no boiling occurred, the data gave a good correlation. Runs made in the nucleate-boiling region, however, gave higher values of heat-transfer coefficient than would be predicted by the Nusselt relation.
Date: September 27, 1950
Creator: Kaufman, Samuel J & Isely, Francis D
Item Type: Report
Partner: UNT Libraries Government Documents Department

Preliminary investigation of molybdenum disulfide-air-mist lubrication for roller bearings operating to DN values of 1 x 10(exp 6) and ball bearings operating to temperatures of 1000 F

Description: The effectiveness of molybdenum disulfide MoS2 as a bearing lubricant was determined at high temperature and at high speeds. A 1-inch-bore ball bearing operated at temperatures to 1000 F, a speed of 1725 rpm, and a thrust load of 20 pounds when lubricated only with MoS2-air mist. A 75-millimeter-bore cageless roller bearing, provided with a MoS2-syrup coating before operation, operated at DN values to 1 x 10(exp 6) with a load of 368 pounds.
Date: October 15, 1951
Creator: Macks, E F; Nemeth, Z N & Anderson, W J
Item Type: Report
Partner: UNT Libraries Government Documents Department

Investigation of ceramic, graphite, and chrome-plated graphite nozzles on rocket engine

Description: The use of ceramic material for rocket nozzles and the effectiveness of preventing oxidation and erosion of graphite nozzles by chrome-plating the internal surface were investigated. A supported ceramic nozzle, cracked by initial operation, was operated a second time without further cracking or damage. Chrome-plating the internal surface of graphite nozzles effectively prevented oxidation and erosion that occurred during operation with unprotected graphite.
Date: March 7, 1949
Creator: Kinney, George R & Lidman, William G
Item Type: Report
Partner: UNT Libraries Government Documents Department

Investigation of combustion in 16-inch ram jet under simulated conditions of high altitude and high Mach number

Description: Results obtained with three different burner configurations in a connected-pipe investigation of a 16-inch ram jet are presented. The radial position of the fuel injector and the engine-outlet area both affected burner performance. For a given configuration, only slight changes in total-pressure ratio across the combustion chamber were obtained over the complete range of operation. With one burner, combustion efficiencies obtained at a combustion-chamber-inlet static pressure of 800 pounds per square foot absolute were greater than those obtained at 1920 pounds per square foot absolute.
Date: June 27, 1957
Creator: Nussdorfer, T J; Sederstrom, D C & Perchonok, E
Item Type: Report
Partner: UNT Libraries Government Documents Department