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Theoretical wave drags and pressure distributions for axially symmetric open-nose bodies

Description: Report presenting the variations of pressure distributions and coefficients of wave drag with fineness ratio, Mach number, and area ratio as calculated from linearized theory for a variety of open-nose bodies of revolution at zero angle of attack. Pressure distributions and values of wave-drag coefficients are given for several bodies with curved and straight lips and for design and off-design conditions including the effects of additive drag.
Date: June 1950
Creator: Jack, John R.
Item Type: Refine your search to only Report
open access

Linearized Supersonic Axially Symmetric Flow About Open-Nosed Bodies Obtained by Use of Stream Function

Description: "The use of Stokes' stream function for axially symmetric problems in linearized supersonic flow is discussed. The computation of streamlines away from the body is shown to be facilitated by solving the stream-function problem rather than the potential problem. Use is made of the stream function throughout this report" (p. 1).
Date: June 1950
Creator: Moore, Franklin
Item Type: Refine your search to only Report
open access

Investigation of a NACA high-speed optical torquemeter

Description: Report presenting a performance investigation of an optical torquemeter, which has an indicating system that requires no physical connection to the torsion shaft. Dynamic tests of the torquemeter were made over a range of shaft speeds and torque loads. Results regarding the torsion-shaft static calibration, dynamic operation, and practicability of the instrument are provided.
Date: June 1950
Creator: Rebeske, John J., Jr.
Item Type: Refine your search to only Report
open access

Effect of Humidity on Performance of Turbojet Engines

Description: Report presenting an experimental and analytical investigation to determine the effect of humidity on turbojet-engine performance. The humidity effect was found to be very small with the magnitude depending on the basis of comparison. Results regarding the calculated humidity correction factors, experimental effect of humidity of engine performance, and variation of saturation specific humidity with altitude are provided.
Date: June 1950
Creator: Samuels, John C. & Gale, B. M.
Item Type: Refine your search to only Report
open access

Theoretical Calculations of the Lateral Force and Yawing Moment Due to Rolling at Supersonic Speeds for Sweptback Tapered Wings With Streamwise Tips: Subsonic Leading Edges

Description: Note presenting the lateral force and yawing moment due to combined angle of attack and rolling, which have been evaluated for families of thin sweptback tapered wings with streamwise tips. Equations were derived for wings that are contained between the Mach cones springing from the wing apex and from the trailing edge of the root section, which are wings with subsonic leading edges and supersonic trailing edges. Some calculations, based on these equations, are included for groups of wings with… more
Date: June 1950
Creator: Margolis, Kenneth
Item Type: Refine your search to only Report
open access

Prandtl-Meyer Flow for a Diatomic Gas of Variable Specific Heat

Description: Report presenting tables and charts that give the results of an analysis accounting for variation in specific heats of a nonviscous compressible fluid during a Prandtl-Meyer flow process. The analysis results indicated that the effect of variation in specific heat on the magnitude of parameters pertinent to the flow is appreciable at high temperatures and high expansion pressure ratios.
Date: June 1950
Creator: Noyes, Robert N.
Item Type: Refine your search to only Report
open access

An Investigation of the Effect of Tetraethyl Lead and Ethyl Nitrite on the Autoignition Characteristics of Isooctane and Triptane

Description: Report presenting an investigation to study the effect of tetraethyl lead, a knock inhibitor, on isooctane. A brief study of ethyl nitrate was also carried out, which demonstrated that it decreased both the delay and critical explosion pressure. Several series of tests were carried out involving different combinations of lead and fuel-air ratio.
Date: June 1950
Creator: Jovellanos, J. U.; Taylor, E. S.; Taylor, C. F. & Leary, W. A.
Item Type: Refine your search to only Report
open access

A numerical procedure for designing cascade blades with prescribed velocity distribution in incompressible potential flow

Description: Report presenting a step-by-step numerical procedure based on conformal-mapping theory for the design of a cascade of airfoils with a prescribed dimensionless-velocity distribution in incompressible potential flow. It includes a set of tables to serve as a guide in computation. A comparison of several different types of airfoil design are included to examine the reliability of the procedure.
Date: June 1950
Creator: Hansen, Arthur G. & Yohner, Peggy L.
Item Type: Refine your search to only Report
open access

Investigation of First Stage of Two-Stage Turbine Designed for Free-Vortex Flow

Description: Note presenting an experimental investigation of the first stage of a two-stage turbine designed for free-vortex flow. The results of the investigation showed that highest adiabatic efficiency was attained when the turbine was operating near the design total-pressure ratio. Results regarding power and efficiency, weight rate of gas flow through the turbine, weight-flow distribution at stator-cascade outlets, stator and rotor flow angles at mean radii, radial distribution of flow angle, radial d… more
Date: June 1950
Creator: Englert, G. W. & Ross, A. O.
Item Type: Refine your search to only Report
open access

Analytical Method for Determining Transmission and Absorption of Time-Dependent Radiation Through Thick Absorbers 3: Absorber With Radioactive Daughter Products

Description: Report presenting a theoretical treatment of absorption problems that considers the following cases: radiation is normal to an absorber with plane parallel surfaces, radiations are of several polyenergetic types, induced radioactive isotopes decay to stable atoms in multistep decay processes, and radiations from the absorber affect the time-dependency of the source activity. Radiation from intermediate isotopes can become more dangerous than the original activity, so the entire range of radiati… more
Date: June 1950
Creator: Allen, G.
Item Type: Refine your search to only Report
open access

Frequency response of positive-displacement variable stroke fuel pump

Description: From Summary: "The dynamic characteristics of an axial-piston, variable-stroke, jet-engine fuel pump were experimentally determined by frequency-response tests. It was found that the pump can be approximated by a first-order linear system with an average time constant of 0.04 second. The order of magnitude of the lag of the pump is negligible compared with current jet engines. It was also established that such a pump may be used for obtaining sinusoidal fuel pressures of variable frequency and … more
Date: June 1950
Creator: Shames, Harold; Himmel, Seymour C. & Blivas, Darnold
Item Type: Refine your search to only Report
open access

Comparison between theory and experiment for wings at supersonic speeds

Description: Report presenting a critical comparison between experimental and theoretical results for the aerodynamic characteristics of wings at supersonic flight speeds. The lift, pitching moment, and drag characteristics of several families of wings of varying plan form and section in the wind tunnel and compared with values predicted by the three-dimensional linear theory.
Date: June 1950
Creator: Vincenti, Walter G.
Item Type: Refine your search to only Report
open access

Theoretical turbojet thrust augmentation by evaporation of water during compression as determined by use of a Mollier diagram

Description: Report presenting a Mollier diagram for air saturated with water vapor and charts showing thermodynamic properties of various air-water vapor and exhaust gas-water vapor mixtures as aids in calculating the thrust augmentation theoretically possible by the evaporation of water during compression. A discussion of the theoretical augmentation results is also provided.
Date: June 1950
Creator: Trout, Arthur M.
Item Type: Refine your search to only Report
open access

Turbojet thrust augmentation by evaporation of water prior to mechanical compression as determined by use of psychrometric chart

Description: Report presenting an investigation of the thrust augmentation of a turbojet engine resulting from the evaporation of water prior to mechanical compression over a range of flight Mach numbers, altitudes, ambient temperatures, and ambient relative humidities. The amount of thrust augmentation possible from compressor-inlet-air saturation increased with an increase in flight Mach number and decreased as the altitude was increased. Results regarding the psychrometric chart, generalized performance … more
Date: June 1950
Creator: Wilcox, E. Clinton
Item Type: Refine your search to only Report
open access

General method for computation of equilibrium composition and temperature of chemical reactions

Description: Report presenting an approximation process that can be used to determine both composition and temperature resulting from a chemical reaction. It is suitable for use with any set of reactants over the complete range of mixture ratios as long as the products of reaction are ideal gases.
Date: June 1950
Creator: Huff, Vearl N. & Morrell, Virginia E.
Item Type: Refine your search to only Report
open access

Study of effects of sweep on the flutter of cantilever wings

Description: Report presenting an experimental and analytical investigation of the flutter of sweptback cantilever wings. The experiment employed groups of wings swept back by rotating and by shearing, with a range of angles of sweep tested. Comparison with experimental results indicated that the analysis is generally satisfactory for the main effects of sweep.
Date: June 1950
Creator: Barmby, J. G.; Cunningham, H. J. & Garrick, I. E.
Item Type: Refine your search to only Report
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