UNT Libraries Government Documents Department - 19,058 Matching Results

Search Results

prev Results: 9361 - 9384 next
open access

Component Operating Trends During Acceleration and Deceleration of Two Hypothetical Two-Spool Turbojet Engines

Description: Memorandum presenting an investigation of the compressor and turbine operating trends during acceleration and deceleration of two hypothetical two-spool turbojet engines. The two engines have the same component performance maps but the arbitrarily specified ratio of outer- to inner-spool moment of inertia for the second engine is 4 times that specified for the first engine. Results regarding the acceleration characteristics and deceleration characteristics are provided.
Date: April 21, 1955
Creator: Dugan, James F., Jr.
Item Type: Refine your search to only Report
open access

Correlation of turbine-blade-element losses based on wake momentum thickness with diffusion parameter for a series of subsonic turbine blades in two-dimensional cascade and for four transonic turbine rotors

Description: Report presenting an analysis of losses occurring in a series of subsonic turbine blades in a low-speed two-dimensional cascade and in a related series of four transonic rotors. Results regarding the two-dimensional cascade loss correlations, transonic turbine loss correlations, effect of unsteady flows, and mixing of stator wakes are provided.
Date: April 21, 1955
Creator: Wong, Robert Y. & Stewart, Warner L.
Item Type: Refine your search to only Report
open access

Effect of ejector performance of varying diameter ratio by simulated iris flaps

Description: Report presenting an investigation in the 8- by 6-foot supersonic wind tunnel at several free-stream Mach numbers for a range of primary-nozzle pressure ratios and secondary weight-flow ratios to determine the effects on performance of varying the ejector diameter ratio by simulated iris flaps. Results indicated that increases in ejector gross force and secondary-to-primary total-pressure ratio were obtained subsonically when diameter ratio was reduced, thus reducing overexpansion losses.
Date: April 21, 1955
Creator: Valerino, Alfred S. & Stitt, Leonard E.
Item Type: Refine your search to only Report
open access

Effect of outer-shell design on performance characteristics of convergent-plug exhaust nozzles

Description: Report presenting an investigation to determine the effect of outer-shell design variables on the internal performance characteristics of plug-type nozzles designed for a pressure ratio between 6 and 12. Inlet Mach number and outer-shell angle were found to have no effect on nozzle thrust coefficient. For choked flow, the effective throat area decreased when the inlet Mach number or outer-shell angle was increased.
Date: April 21, 1955
Creator: Krull, H. George & Beale, William T.
Item Type: Refine your search to only Report
open access

Investigation of boattail and base pressures of twin-jet afterbodies at Mach number 1.91

Description: Report presenting an investigation of the boattail pressures and base pressures of two twin-jet afterbody configurations at Mach number 1.91. They were designed as a simple merging of two blunt-based conical afterbodies with spacings of 1.4 and 1.7 jet diameters between the jet center lines. Results regarding support-strut interference, effect of jet spacing ratio, effect of jet exit angle, longitudinal boattail pressure distribution, circumferential pressure distributions, and effect of a refl… more
Date: April 21, 1955
Creator: Salmi, Reino J. & Klann, John L.
Item Type: Refine your search to only Report
open access

NACA research on slurry fuels through 1954

Description: Report presenting a review of NACA research on slurry fuels through 1954. Slurry fuels are defined as suspensions of metals in hydrocarbons, which may offer more flight range or thrust than can be obtained with conventional hydrocarbons. Magnesium is the primary metal of interest at this time for high thrust and boron for long-range flight.
Date: April 21, 1955
Creator: Olson, Walter T. & Breitwieser, Roland
Item Type: Refine your search to only Report
open access

An Evaluation of the Roll-Rate Stabilization System of the Sidewinder Missile at Mach Numbers from 0.9 to 2.3

Description: "A linear stability analysis and flight-test investigation has been performed on a rolleron-type roll-rate stabilization system for a canard-type missile configuration through a Mach number range from 0.9 to 2.3. This type damper provides roll damping by the action of gyro-actuated uncoupled wing-tip ailerons. A dynamic roll instability predicted by the analysis was confirmed by flight testing and was subsequently eliminated by the introduction of control-surface damping about the rolleron hing… more
Date: April 22, 1955
Creator: Nason, Martin L.; Brown, Clarence A., Jr. & Rock, Rupert S.
Item Type: Refine your search to only Report
open access

Nuclear metallurgy lectures

Description: This report discusses the corrosion of fuel element jackets and process tubes. A brief background in electrochemistry is presented, and the corrosion of aluminium, aluminium alloys and zirconium is summarized.
Date: April 22, 1955
Creator: Groot, C.
Item Type: Refine your search to only Report
open access

Aerodynamic characteristics of a 60 degree delta wing having a half-delta tip control at a Mach number of 4.04

Description: From Introduction: "Numerous tests of tip controls on delta wings at transonic and low supersonic speeds have shown that such configurations provide satisfactory rolling-moment effectiveness, and that the hinge can be controlled by proper location of the hinge line (ref. 1). The purpose of the present tests is to determine the characteristics of such a configuration at Mach number of 4.04 and a Reynolds number of 5.8 X 10^6, based on the wing mean aerodynamic chord."
Date: April 25, 1955
Creator: Ulmann, Edward F. & Smith, Fred M.
Item Type: Refine your search to only Report
open access

Lift, drag, and longitudinal stability at Mach numbers from 0.8 to 2.1 of a rocket-powered model having a tapered unswept wing of aspect ratio 3 and inline tail surfaces

Description: Report presenting an investigation of a configuration of a body of fineness ratio 16.9, an unswept wing of aspect ratio 3, and a taper ratio of 0.4, and incline tail surfaces who was aeropulsed continuously in pitch during free flight with and without a sustainer rocket motor operating. A range of Mach numbers from 0.8 to 2.1 was tested. Results regarding drag, normal force and pitching moment, flow conditions at the horizontal tail, buffeting and model vibrations, and cross coupling are provid… more
Date: April 25, 1955
Creator: Gillespie, Warren, Jr.
Item Type: Refine your search to only Report
open access

Lift, drag, and static longitudinal stability characteristics of four airplane-like configurations at Mach numbers from 3.00 to 6.28

Description: Report presenting lift, drag, and pitching-moment coefficients, lift-drag ratios, and center-of-pressure positions for four airplane-like configurations determined from tests at a range of Mach numbers and angles of attack. The wings and nose shapes were modified for each of the configurations.
Date: April 25, 1955
Creator: Neice, Stanford E.; Wong, Thomas J. & Hermach, Charles A.
Item Type: Refine your search to only Report
open access

The Quantitative Techniques of Scintillation Spectrometry as Applied to the Calibration of Standard Sources

Description: Report presenting "the determination of absolute gamma emission rates for monoenergetic gamma emitters using a single-channel scintillation spectrometer. Examples are given for Cr⁵¹, Cs¹³⁷, Nb⁹⁵, and Zn⁶⁵. Sources of error are discussed and steps being taken to improve the accuracy of the method are described" (p. 1).
Date: April 25, 1955
Creator: Heath, R. L. & Schroeder, F.
Item Type: Refine your search to only Report
open access

Studies on the Experimental Pathology and Biochemistry of the Pulmonary Granulomatosis of Beryllium Workers. Section II, Consolidated Progress Report. Supplement: a Review of the Physical Chemistry of Beryllium

Description: The status of research is reviewed in a study of pulmonary granulomatosis in beryllium workers. Equipment for use in dust exposure studies is described. Preliminary results are reported from studies on the tissue distribution and pathological effects of beryllium dust in rats; the physical chemistry of solutions of beryllium salts; the effects of beryllium on enzyme systems, and the effects of ascorbic acid on beryllium excretion.
Date: April 25, 1955
Creator: Schepers, G. W. H. (Gerrit Willem Hendrik), 1914-
Item Type: Refine your search to only Report
open access

Wind-Tunnel Measurements at Subsonic Speeds of the Static and Dynamic-Rotary Stability Derivatives of a Triangular-Wing Airplane Model Having a Triangular Vertical Tail

Description: Report presenting the results of oscillation tests to measure the dynamic-rotary stability derivatives of an airplane model at high subsonic speeds. Measurements taken included the damping in pitch, damping in yaw, damping in roll, and the yawing moment due to rolling velocity.
Date: April 25, 1955
Creator: Beam, Benjamin H.; Reed, Verlin D. & Lopez, Armando E.
Item Type: Refine your search to only Report
open access

Nuclear rockets

Description: A systems analysis is made of a class of nuclear-propelled rockets in combination with chemical boosters. Various missions are considered including the delivery of 5000-lb payload 5500 nautical miles, the placement of a satellite in an orbit about the earth and the delivery of a payload to escape velocity. The reactors considered are of the heterogeneous type utilizing graphite fuel elements in a matrix of Be or hydrogenous moderator. Liquid hydrogen and ammonia are considered as propellants. G… more
Date: April 26, 1955
Creator: York, H.F. & Biehl, A.T.
Item Type: Refine your search to only Report
open access

RESEARCH AND DEVELOPMENT IN THE FIELD OF THORIUM CHEMISTRY AND METALLURGY. Monthly Progress Report for March 15 thru April 15, 1955

Description: A transition program, eliminating most of the wet chemical techniques for the preparation of cell feed and replacing these with a high temperature chlorination process, was begun. Crushing tests on a Fitz mill were initiated and tentative conclusions are that this type of equipment as superior to a combination of jaw and roll crushing. Small scale chlorination experiments indicate the feasibility of pelletizing ThOCO/sub 3/ for feed to a eontinuous hightemperature chlorinator. (D.E.B.)
Date: April 26, 1955
Creator: Wyatt, J.L.
Item Type: Refine your search to only Report
Back to Top of Screen