Analysis of transonic rotor-blade passage loss with hot-wire anemometers (open access)

Analysis of transonic rotor-blade passage loss with hot-wire anemometers

From Introduction: "This report presents data from measurements of the flow in a single-stage research compressor, which supports the model of reference 1. A calculated shock technique similar to that of reference 1 is incorporated with these experimental results. Another approach for estimating passage shock loss given a flow rate and blade geometry was reported in reference 2."
Date: June 5, 1958
Creator: Lewis, George W.; Tysl, Edward R. & Fessler, Theodore E.
System: The UNT Digital Library
Comparison of Semispan and Full-Span Tests of a 47.5 Degrees Sweptback Wing With Symmetrical Circular-Arc Sections and Having Drooped-Nose Flaps, Trailing-Edge Flaps, and Ailerons (open access)

Comparison of Semispan and Full-Span Tests of a 47.5 Degrees Sweptback Wing With Symmetrical Circular-Arc Sections and Having Drooped-Nose Flaps, Trailing-Edge Flaps, and Ailerons

Report presenting an investigation to compare the characteristics of a full-span and a semispan highly swept wing in order to evaluate the general validity of the semispan wing testing technique. Results regarding the lift, drag, and pitching-moment characteristics are provided.
Date: December 5, 1951
Creator: Lipson, Stanley & Barnett, U. Reed, Jr.
System: The UNT Digital Library
Aerodynamic and Lateral-Control Characteristics of a 1/28-Scale Model of the Bell X-1 Airplane Wing-Fuselage Combination: Transonic-Bump Method (open access)

Aerodynamic and Lateral-Control Characteristics of a 1/28-Scale Model of the Bell X-1 Airplane Wing-Fuselage Combination: Transonic-Bump Method

Report discussing an investigation into the lateral-control characteristics and the pitching-moment characteristics of a scale model of the X-1 wing-fuselage configuration. Information about the estimated variation of rolling effectiveness and wing-fuselage pitching-moment coefficient is described in detail.
Date: May 5, 1950
Creator: Lockwood, Vernard E.
System: The UNT Digital Library
Aerodynamic characteristics of several tip controls on a 60 degree wing at a Mach number of 1.61 (open access)

Aerodynamic characteristics of several tip controls on a 60 degree wing at a Mach number of 1.61

Report presenting an investigation at a Mach number of 1.61 to determine the control effectiveness characteristics of seven tip controls on a 60 degree delta wing. Pressure distribution measurements were made for a range of angles of attack and control deflections. Results regarding the effect of control deflection, effect of wing angle of attack, effect of hinge-line location, effect of fences, and effect of control size and location are provided.
Date: August 5, 1954
Creator: Lord, Douglas R. & Czarnecki, K. R.
System: The UNT Digital Library
Investigation of the Effect of Balancing Tabs on the Hinge-Moment Characteristics of a Trailing-Edge Flap-Type Control on a Trapezoidal Wing at a Mach Number of 1.61 (open access)

Investigation of the Effect of Balancing Tabs on the Hinge-Moment Characteristics of a Trailing-Edge Flap-Type Control on a Trapezoidal Wing at a Mach Number of 1.61

Report presenting an investigation at Mach number 1.61 to determine the effect of 10-percent control are attached tabs on the hinge-moment characteristics of a trailing-edge flap-type control on a trapezoidal wing with a 23 degree sweptback leading edge, aspect ratio of 3.1, and taper ratio of 0.4. Results regarding hinge-moment coefficients, tab parameters, and control effectiveness are provided.
Date: August 5, 1954
Creator: Lord, Douglas R. & Driver, Cornelius
System: The UNT Digital Library
Boundaries of Supersonic Axisymmetric Free Jets (open access)

Boundaries of Supersonic Axisymmetric Free Jets

Report presenting calculations by the method of characteristics of 2960 boundaries of supersonic axisymmetric free jets exhausting from conically divergent nozzles into still air. The calculations covered a range of jet Mach numbers, a ratio of specific heats of the jet, divergence angles of the nozzle, and jet static-pressure ratios. Results regarding the effect of increasing the static pressure ratio, the simulation of one jet boundary by another, and interpolation and extrapolation of calculated boundaries are provided.
Date: October 5, 1956
Creator: Love, Eugene S.; Woodling, Mildred J. & Lee, Louise P.
System: The UNT Digital Library
Langley Full-Scale-Tunnel Investigation of Maximum Lift and Stability Characteristics of an Airplane Having Approximately Triangular Plan Form (DM-1 Glider) (open access)

Langley Full-Scale-Tunnel Investigation of Maximum Lift and Stability Characteristics of an Airplane Having Approximately Triangular Plan Form (DM-1 Glider)

"An investigation of the DM-1 Glider, which had approximately triangular plan form, an aspect ratio of 1.8 and a 60 degree sweptback leading edge, has been conducted in the Langley full-scale tunnel. The investigation consisted of the determination of the separate effects of the following modifications made to the glider on its maximum lift and stability characteristics: (a) installation of sharp leading edges over the inboard semispan of the wing, (b) removal of the vertical fin, (c) sealing of the elevon control-balance slots, (d) installation of redesigned thin vertical surfaces, (e) installation of faired sharp leading edges, and (f) installation of canopy" (p. 1).
Date: August 5, 1947
Creator: Lovell, J. Calvin & Wilson, Herbert A., Jr.
System: The UNT Digital Library
Review of the Maximum-Lift Characteristics of Thin and Swept Wings (open access)

Review of the Maximum-Lift Characteristics of Thin and Swept Wings

Report discussing several investigations into the maximum-lift capabilities of aircraft wings at high speeds. Testing of thin unswept and swept wings at subsonic and transonic speeds, thin and thick wings, and the effect of airfoil sections on various airplanes is presented and compared.
Date: June 5, 1951
Creator: Lowry, John G. & Cahill, Jones F.
System: The UNT Digital Library
Load-Range Performance of Turbine-Propeller Engine in Transonic Speed Range and Comparison With Load-Range Performance of Turbojet Engine (open access)

Load-Range Performance of Turbine-Propeller Engine in Transonic Speed Range and Comparison With Load-Range Performance of Turbojet Engine

Memorandum presenting an investigation of the effect on load-range performance of various combinations of compressor pressure ratio and turbine-inlet temperature for the turbine-propeller engine and to provide a means for comparing the load range of turbine-propeller and turbojet engines for a range of flight speeds.
Date: January 5, 1951
Creator: Lubarsky, Bernard
System: The UNT Digital Library
Preliminary comparison of 17- and 75-millimeter-bore cageless cylindrical roller bearings with conventional cylindrical roller bearings at high speeds (open access)

Preliminary comparison of 17- and 75-millimeter-bore cageless cylindrical roller bearings with conventional cylindrical roller bearings at high speeds

Preliminary results at high speeds indicate lower bearing temperatures, less internal bearing wear, and greater reliability of the conventional, cage-type cylindrical roller bearings than of either full-complement or special cageless roller bearings of the types investigated, although the latter bearing types have been operated successfully to DN values of 1.0 X 10 superscript 6.
Date: March 5, 1953
Creator: Macks, E. Fred; Anderson, W. J. & Nemeth, Zolton N.
System: The UNT Digital Library
Tests of a Northrop XSSM-A-3 Missile in the Ames 40- by 80-Foot Wind Tunnel: Stability and Control (open access)

Tests of a Northrop XSSM-A-3 Missile in the Ames 40- by 80-Foot Wind Tunnel: Stability and Control

From Summary: "This report presents the results of wind-tunnel force tests which were conducted to determine the low-speed stability and control characteristics of a full-scale Northrop XSSM-A-3 missile. Tests were made through a range of angles of attack, sideslip, and control deflection, and at various Reynolds numbers. Characteristics of the complete missile are compared with the characteristics of the missile with the landing skids extended, with the vertical tail removed, and with the fuselage alone. No analysis of the data has been made in order to make the results available as soon as possible."
Date: April 5, 1950
Creator: Maki, Ralph L.
System: The UNT Digital Library
Effect of air distribution on radial temperature distribution in one-sixth sector of annular turbojet combustor (open access)

Effect of air distribution on radial temperature distribution in one-sixth sector of annular turbojet combustor

Report presenting an experimental investigation in a one-sixth sector of an annular turbojet combustor to determine a method of controlling radial exhaust-gas-temperature distribution in a gas-turbine combustion chamber. The adjustment in controlling air was made by ducting the dilution air into the combustion zone in a predetermined manner through hollow radial struts or by modifying the basket-wall open-hole area. Results regarding the temperature distribution, temperature-rise efficiency, total-pressure loss, and altitude operating limits are provided.
Date: April 5, 1950
Creator: Mark, Herman & Zettle, Eugene V.
System: The UNT Digital Library
The effects of boundary-layer control on the longitudinal characteristics of a swept-back wing using suction through streamwise slots in the outboard portion of the wing (open access)

The effects of boundary-layer control on the longitudinal characteristics of a swept-back wing using suction through streamwise slots in the outboard portion of the wing

Report presenting an investigation to determine the effects of a simplified form of boundary-layer control on the low-speed longitudinal characteristics of a sweptback wing. The primary objective was to improve the longitudinal characteristics of the sweptback wing at lift coefficients below the maximum. Results regarding the characteristics of the wing without boundary-layer control and effects of boundary-layer control are provided.
Date: January 5, 1951
Creator: McCormack, Gerald M. & Tolhurst, William H., Jr.
System: The UNT Digital Library
Effect of Water on Carbon Monoxide-Oxygen Flame Velocity (open access)

Effect of Water on Carbon Monoxide-Oxygen Flame Velocity

"The flame velocities were measured of 20 percent oxygen and 80 percent carbon monoxide mixtures containing either light water or heavy water. The flame velocity increased from 34.5 centimeters per second with no added water to about 104 centimeters per second for a 1.8 percent addition of light water and to 84 centimeters per second for an equal addition of heavy water. The addition of heavy water caused greater increases in flame velocity with equilibrium hydrogen-atom concentration than would be predicted by the Tanford and Pease square-root relation" (p. 1).
Date: February 5, 1954
Creator: McDonald, Glen E.
System: The UNT Digital Library
Measurement of Uniform Flame Movement in Carbon Monoxide - Air Mixtures Containing Either Added D2O or H2O (open access)

Measurement of Uniform Flame Movement in Carbon Monoxide - Air Mixtures Containing Either Added D2O or H2O

Relative velocities of the flame in a carbon monoxide - air mixture containing either added heavy water or light water were measured in a glass tube. Throughout the range of carbon monoxide - air composition, the flame containing added light water had a faster speed than the flame containing heavy water.
Date: July 5, 1950
Creator: McDonald, Glen E.
System: The UNT Digital Library
Instrumentation and calibration technique for flight calibration of angle-of-attack systems on aircraft (open access)

Instrumentation and calibration technique for flight calibration of angle-of-attack systems on aircraft

From Summary: "Data are presented on the instrumentation and calibration technique used in determining the position error of angle-of-attack sensors mounted on the fuselage of a 35 degree swept-wing fighter airplane. The true angle of attack was determined by the use of a nose boom with five angle-of-attack vanes spaced 20 inches apart on alternate sides of the boom. Errors due to boom bending, upwash around the boom, and vane floating angle were measured and corrections applied to all indicated angles of attack."
Date: December 5, 1952
Creator: McFadden, Norman M.; Holden, George R. & Ratcliff, Jack W.
System: The UNT Digital Library
An Investigation of a 0.16-Scale Model of the Douglas X-3 Airplane to Determine Means of Improving the Low-Speed Longitudinal Stability and Control Characteristics (open access)

An Investigation of a 0.16-Scale Model of the Douglas X-3 Airplane to Determine Means of Improving the Low-Speed Longitudinal Stability and Control Characteristics

Report presenting an investigation of a model of the Douglas X-3 to determine some methods to improve the low-speed longitudinal stability and control characteristics. Some of the components tested included plain and slotted leading-edge flaps and plain, split, and slotted trailing-edge flaps. Results regarding the effect of various factors on longitudinal stability and flap characteristics are presented.
Date: November 5, 1952
Creator: McKee, John W. & Riebe, John M.
System: The UNT Digital Library
Vapor pressures and calculated heats of vaporization of concentrated nitric acid solutions in the composition range 71 to 89 percent nitrogen dioxide, 1 to 10 percent water, and in the temperature range 10 to 60 degrees C (open access)

Vapor pressures and calculated heats of vaporization of concentrated nitric acid solutions in the composition range 71 to 89 percent nitrogen dioxide, 1 to 10 percent water, and in the temperature range 10 to 60 degrees C

From Summary: "Total vapor pressures were measured for 16 acid mixtures of the ternary system nitric acid, nitrogen dioxide, and water within the temperature range 10 degrees to 60 degrees Celsius, and with the composition range 71 to 89 weight percent nitric acid, 7 to 20 weight percent nitrogen dioxide, and 1 to 10 weight percent water. Heats of vaporization were calculated from the vapor pressure measurements for each sample for the temperatures 25, 40, and 60 degrees Celsius. The ullage of the apparatus used for the measurements was 0.46. Ternary diagrams showing isobars as a function of composition of the system were constructed from experimental and interpolated data for the temperatures 25, 40, 45, and 60 degrees C and are presented herein."
Date: February 5, 1954
Creator: McKeown, A. B. & Belles, Frank E.
System: The UNT Digital Library
Analysis of Off-Design Performance of a 16-Stage Axial-Flow Compressor With Various Blade Modifications (open access)

Analysis of Off-Design Performance of a 16-Stage Axial-Flow Compressor With Various Blade Modifications

"The over-all performance of a 16-stage axial-flow compressor was determined with various stator-blade resettings and a reduction in solidity of the rotor blades in the last three stages. It was shown that little control over the sudden change in slope of the surge-limit line at intermediate speeds was obtained with the blade modifications attempted, except that some change in speed at which the change in slope occurred could be effected by stator-blade resettings" (p. 1).
Date: March 5, 1953
Creator: Medeiros, Arthur A.; Benser, William A. & Hatch, James E.
System: The UNT Digital Library
Effect of Inlet Temperature on Rotating Stall and Blade Vibrations in a Multistage Axial-Flow Compressor (open access)

Effect of Inlet Temperature on Rotating Stall and Blade Vibrations in a Multistage Axial-Flow Compressor

Report presenting rotating-stall and blade-vibration data for the first three rotor blade rows of a 13-stage axial-flow compressor at several inlet temperatures. Stall patterns of 1 through 5 stall zones were detected at all inlet temperatures in the equivalent compressor speed ranges between 4600 and 6200 rpm.
Date: August 5, 1955
Creator: Medeiros, Arthur A.; Calvert, Howard F. & Fenn, David B.
System: The UNT Digital Library
Free-flight performance of 16-inch-diameter supersonic ram-jet units 2: five units designed for combustion-chamber-inlet Mach number of 0.16 at free-stream Mach number of 1.60 (units B-1, B-2, B-3, B-4, and B-5) (open access)

Free-flight performance of 16-inch-diameter supersonic ram-jet units 2: five units designed for combustion-chamber-inlet Mach number of 0.16 at free-stream Mach number of 1.60 (units B-1, B-2, B-3, B-4, and B-5)

Free-flight performance of five 16-inch-diameter ram-jet units was determined over range of free-stream Mach numbers of 0.50 to 1.86 and gas total-temperature ratios between 1.0 and 6.1 Time histories of performance data are presented for each unit. Correlations illustrate effect of free-stream Mach number and gas total-temperature ratio on diffuser total-pressure recovery, net-thrust coefficient, and external drag coefficient. One unit had smooth steady burning throughout the entire flight and encountered a maximum free-stream Mach number of 1.86 with a net acceleration of approximately 4.2 g's.
Date: May 5, 1950
Creator: Messing, Wesley E. & Simpkinson, Scott H.
System: The UNT Digital Library
Experimental Investigation of Supersonic Flow With Detached Shock Waves for Mach Numbers Between 1.8 and 2.9 (open access)

Experimental Investigation of Supersonic Flow With Detached Shock Waves for Mach Numbers Between 1.8 and 2.9

Memorandum presenting results of an experimental investigation of the flow near the nose of plane and axially symmetric bodies in the presence of detached shock waves, which are compared with predictions of theory. The location of the detached shock wave was determined from schileren photographs for a variety of nose shapes over a range of free-stream Mach numbers from 1.8 to 2.9. Results regarding schileren photographs, shock-location parameter, effect of b/T on shock form, effect of body form on shock form, effect of angle of attack on shock form and location, pressure distributions, drag coefficients, and nose inlets are provided.
Date: July 5, 1950
Creator: Moeckel, W. E.
System: The UNT Digital Library
Experimental Pressure Distributions Over Two Wing-Body Combinations at Mach Number 1.9 (open access)

Experimental Pressure Distributions Over Two Wing-Body Combinations at Mach Number 1.9

Memorandum presenting pressure distributions on two wing-body combinations obtained at a Mach number of 1.9 to investigate the wing-body interference. A rectangular wing, a triangular wing, and a cylindrical body with an ogive nose were studied alone and in combination. The pressure distributions over the wing-body combination compared favorably with theoretical calculations based primarily on a generalization of the method of Nielsen and Matteson, except at the root section of the wings where the boundary layer of the body modified the flow.
Date: February 5, 1951
Creator: Moskowitz, Barry & Maslen, Stephen H.
System: The UNT Digital Library
Investigation of a Systematic Group of NACA 1-Series Cowling With and Without Spinners (open access)

Investigation of a Systematic Group of NACA 1-Series Cowling With and Without Spinners

Report presenting an investigation to study cowling-spinner combinations based on the NACA 1-series nose inlets and to obtain systemic data for one family of approximately ellipsoidal spinners. 11 of the spinners were also tested in various combinations with 9 NACA open-nose cowlings, which were also tested without spinners. Results regarding flow over spinners, internal flow, external flow over cowling, critical Mach number characteristics, envelope values, and cowling section are provided.
Date: May 5, 1948
Creator: Nichols, Mark R. & Keith, Arvid L., Jr.
System: The UNT Digital Library