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Effects of temperature distribution and elastic properties of materials on gas-turbine-disk stresses

Description: Report presenting calculations to determine the influence of changes in temperature distribution and elastic material properties on calculated elastic stresses for a typical gas-turbine disk. Severe temperature gradients caused thermal stresses of sufficient magnitude to reduce the operating safety of the disk.
Date: June 1947
Creator: Holms, Arthur G. & Faldetta, Richard D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated gasification combined cycle and steam injection gas turbine powered by biomass joint-venture evaluation

Description: This report analyzes the economic and environmental potential of biomass integrated gasifier/gas turbine technology including its market applications. The mature technology promises to produce electricity at $55--60/MWh and to be competitive for market applications conservatively estimated at 2000 MW. The report reviews the competitiveness of the technology of a stand-alone, mature basis and finds it to be substantial and recognized by DOE, EPRI, and the World Bank Global Environmental Facility. more
Date: May 1, 1994
Creator: Sterzinger, G J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Turbine Systems Program, Conceptual Design and Product Development. Task 6, System definition and analysis

Description: The strategy of the ATS program is to develop a new baseline for industrial gas turbine systems for the 21st century, meeting the buying criteria of industrial gas turbine end users, and having growth potential. These criteria guided the Solar ATS Team in selecting the system definition described in this Topical Report. The key to selecting the ATS system definition was meeting or exceeding each technical goal without negatively impacting other commercial goals. Among the most crucial goals are… more
Date: April 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of an Aging Treatment on Life of Small Cast Vitallium Gas-Turbine Blades

Description: Note presenting an investigation conducted to determine the effects of an aging treatment on the life of a small cast Vitallium gas-turbine blades operated at a blade temperature of approximately 1500 degrees Fahrenheit and a stress of 20,000 pounds per square inch at the blade-failure plane. Twenty blades that were aged for 48 hours at 1500 degrees Fahrenheit were compared with 33 unaged blades. Results regarding turbine evaluation and metallurgical examination are provided.
Date: March 1950
Creator: Hoffman, Charles A. & Yaker, Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation of Linearized Dynamics of Gas-Turbine Engines

Description: Note describing a method of engine simulation involving the use of an electronic analog computer in the simulation of controlled aircraft-engine performance. The equations used in developing the method of simulating the dynamics of gas-turbine engines are derived in general form from engine functional relations.
Date: November 1952
Creator: Ketchum, J. R. & Craig, R. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method for rapid graphical evaluation of cooled or uncooled turbojet and turboprop engine or component performance (effects of variable specific heat included)

Description: Report presenting a series of curves that have been prepared to simplifying and accelerate calculation procedures for component or overall cycle performance of gas-turbine engines. The curves are based on the thermodynamic properties of air and combustion gases for a hydrogen-combustion ratio of 0.167.
Date: January 1955
Creator: Esgar, Jack B. & Ziemer, Robert R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Physical Properties at Elevated Temperature of Seven Hot-Pressed Ceramics

Description: Report presenting an investigation of seven hot-pressed ceramics for possible gas-turbine application. The properties, short-time tensile strength, thermal-shock resistance, coefficient of liner expansion, and density were determined. The ceramics tested were magnesium oxide, titanium carbide, zirconium carbide, boron carbide, silicon carbide with boron carbide, zircon, and zirconia with lime.
Date: July 1949
Creator: Gangler, James J.; Robards, Chester F. & McNutt, James E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of two contour forged gas-turbine discs of 19-9DL alloy

Description: Report describing a research program to ascertain the properties of better alloys in the form of large forgings due to the impact of conditions of fabrication. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deformation characteristics, creep strengths, stability characteristics, and data from tests in other laboratories are provided.
Date: September 1948
Creator: Freeman, J. W.; Reynolds, E. E. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Application of Statistical Methods to Study of Gas-Turbine Blade Failures

Description: Note presenting an investigation conducted to determine the applicability of statistical methods as an approach to the evaluation of materials for use in gas turbines by determining the frequency distribution of time until failure of gas-turbine blades. Two wheels, each incorporating 142 inserted blades of a cast cobalt-base heat-resistant alloy, were tested. The results indicated that the time for first failure may not generally be taken as an accurate indication of the performance of the aver… more
Date: June 1948
Creator: Hoffman, Charles A. & Ault, G. Mervin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A method of cycle analysis for aircraft gas-turbine power plants driving propellers

Description: Report presenting an investigation to develop a convenient and accurate method for analyzing gas-turbine cycles to aid in predicting the performance of propeller-driving power plants and the state of the gas at various stations within the power plant. The method takes into account the effects of ram, altitude, variation of specific heats, increase in weight flow due to the addition of fuel, and thrusts from the exhaust jet.
Date: January 1948
Creator: English, Robert E. & Hauser, Cavour H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of five forged gas-turbine discs of Timken alloy

Description: The properties of five discs of Timken alloy at room temperature and 1200 degrees Fahrenheit. Testing occurred short-time tensile, stress-rupture, creep, and hardness along with a metallographic examination of the materials before and after testing. The Timken alloy discs appear to have similar properties to other types of discs.
Date: June 1948
Creator: Freeman, J. W.; Reynolds, E. E. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of two large discs of CSA alloy

Description: Report describing a research program to ascertain the properties of better alloys in the form of large forgings due to the impact of conditions of fabrication. The properties of two discs of CSA alloy were tested at several temperatures. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deformation characteristics, creep strengths, stability characteristics, and data from tests in other laboratories are provided.
Date: September 1948
Creator: Reynolds, E. E.; Freeman, J. W. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Experimental and Analytical Study of Balanced-Diaphragm Fuel Distributors for Gas-Turbine Engines

Description: "A method of distributing fuel equally to a plurality of spray nozzles in a gas-turbine engine by means of balanced-diaphragm fuel distributors is presented. The experimental performance of three of eight possible distributor arrangements are discussed. An analysis of all eight arrangements is included. Criterions are given for choosing a fuel-distributor arrangement to meet specific fuel-system requirements of fuel-distribution accuracy, spray-nozzle pressure variations, and fuel-system pressu… more
Date: August 14, 1950
Creator: Straight, David M. & Gold, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Control during starting of gas-turbine engines

Description: Report presenting an investigation of the variables pertinent to the control of gas temperatures of gas-turbine engines during starting conducted by obtaining time records of the variables involved during actual starting conditions. Poor control of gas temperatures during starting was found to be caused by an accumulation of fuel in the engine before ignition and excessive fuel-flow rates at the time of ignition.
Date: June 17, 1948
Creator: Koenig, Robert J. & Dandois, Marcel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Gas-turbine-engine operation with variable-area fuel nozzles

Description: Report presenting an examination of the characteristics of variable-area and fixed-area atomizing nozzles in relation to use in aircraft gas-turbine engines. A variable-area fuel nozzle and a fuel-distribution control that were used int eh experimental operation of a turbojet engine are described. Results regarding nozzle characteristics and fuel distribution, effect of atomization on engine operating characteristics, and fuel-system characteristics during engine operation are provided.
Date: July 9, 1948
Creator: Gold, Harold & Straight, David M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of stress states in gas-turbine disk as determined from measured operating-temperature distributions

Description: Report presenting results of an experimental investigation to determine the temperature distribution in an aircraft-engine gas-turbine disk. Calculated stresses based on the measured temperature distributions are presented. Results regarding stresses in the inner region of the disk and stresses in the rim of the disk are provided.
Date: July 21, 1948
Creator: Farmer, J. Elmo; Millenson, M. B. & Manson, S. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Instrumentation for Recording Transient Performance of Gas-Turbine Engines and Control Systems

Description: Report presenting design features for the instrumentation used in a study of the transient performance of gas-turbine engines and control systems. The dynamic characteristics of the instrumentation are discussed and examples of typical acceleration data for a controlled and an uncontrolled engine are provided.
Date: June 27, 1951
Creator: Delio, Gene J. & Schwent, Glennon V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NACA research on combustors for aircraft gas turbines 1: effects of operating variables on steady-state performance

Description: Some of the systematic research conducted by the NACA on aircraft gas-turbine combustors is reviewed. Trends depicting the effect of inlet-air pressure, temperature, and velocity and fuel-air ratio on performance characteristics, such as combustion efficiency, maximum temperature rise attainable, pressure loss, and combustor-outlet temperature distribution are described for a variety of turbojet combustors of the liquid-fuel type. These trends are further discussed as effects significant to the… more
Date: October 18, 1950
Creator: Olson, Walter T. & Childs, J. Howard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of stresses in gas-turbine disks subjected to plastic flow and creep

Description: A finite-difference method previously presented for computing elastic stresses in rotating disks is extended to include the computation of the disk stresses when plastic flow and creep are considered. A finite-difference method is employed to eliminate numerical integration and to permit nontechnical personnel to make the calculations with a minimum of engineering supervision. Illustrative examples are included to facilitate explanation of the procedure by carrying out the computations on a typ… more
Date: March 5, 1948
Creator: Millenson, M. B. & Manson, S. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

General algebraic method applied to control analysis of complex engine types

Description: "A general algebraic method of attack on the problem of controlling gas-turbine engines having any number of independent variables was utilized employing operational functions to describe the assumed linear characteristics for the engine, the control, and the other units in the system. Matrices were used to describe the various units of the system, to form a combined system showing all effects, and to form a single condensed matrix showing the principal effects. This method directly led to the … more
Date: April 25, 1949
Creator: Boksenbom, Aaron S. & Hood, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of effectiveness of convection-, transpiration-, and film-cooling methods with air as coolant

Description: From Summary: "Various parts of aircraft propulsion engines that are in contact with hot gases often require cooling. Transpiration and film cooling, new methods that supposedly utilize cooling air more effectively than conventional convection cooling, have already been proposed. This report presents material necessary for a comparison of the cooling requirements of these three methods. Correlations that are regarded by the authors as the most reliable today are employed in evaluating each of t… more
Date: July 9, 1953
Creator: Eckert, E. R. G. & Livingood, John N. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coolant-Flow Calibrations of Three Simulated Porous Gas-Turbine Blades

Description: "An investigation was conducted at the NACA Lewis laboratory to determine whether simulated porous gas-turbine blades fabricated by the Eaton Manufacturing Company of Cleveland, Ohio would be satisfactory with respect to coolant flow for application in gas-turbine engines. These blades simulated porous turbine blades by forcing the cooling air onto the blade surface through a large number of chordwise openings or slits between laminations of sheet metal or wire. This type of surface has a finit… more
Date: March 20, 1951
Creator: Esger, Jack B. & Lea, Alfred L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Factors Affecting the Starting Characteristics of Gas-Turbine Engines

Description: "This report summarizes the effects of fuel volatility and engine design variables on the problem of starting gas-turbine engines at sea-level and altitude conditions. The starting operation for engines with tubular combustors is considered as three steps; namely, (1) ignition of a fuel-air mixture in the combustor, (2) propagation of flame through cross-fire tubes to all combustors, and (3) acceleration of the engine from windmilling or starting speed to the operating speed range. Pertinent da… more
Date: February 8, 1951
Creator: Lewis Laboratory Fuels Panel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison between predicted and observed performance of gas-turbine stator blade designed for free-vortex flow

Description: Report presenting a comparison between the calculated design performance of a gas-turbine stator blade and its performance in a sector of an annular cascade tunnel. The gas velocities on the blade surface were computed by the stress filament method and compared with experimental values, with which they agreed satisfactorily. Results regarding discharge angle, vane-surface-velocity distribution, tangential- and axial-velocity distribution, and radial-equilibrium consideration are provided.
Date: April 1949
Creator: Huppert, M. C. & MacGregor, Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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