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Interaction of a Free Flame Front With a Turbulence Field

Description: "Small-perturbation spectral-analysis techniques are used to obtain the root-mean-square flame-generated turbulence velocities and the attenuating pressure fluctuations stemming from interaction of a constant-pressure flame front with a field of isotropic turbulence in the absence of turbulence decay processes. The anisotropic flame-generated turbulence velocities are found to be of about the same intensity as those of the incident isotropic turbulence, the lateral turbulence velocities being a… more
Date: January 25, 1955
Creator: Tucker, Maurice
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aerodynamics of the carburetor air scoop and the engine cowling of a single-engine torpedo-bomber-type airplane

Description: From Introduction: "An investigation of the power-plant installation of a single-engine torpedo-bomber-type airplane has been conducted in the NACA Cleveland altitude wind tunnel at the request of the Bureau of Aeronautics, Navy Department. A similar investigation was previously conducted on a three-tenths scale mock-up of the forward portion of the fuselage of this airplane in the Langley 20-foot tunnel. (See reference 1)."
Date: June 1946
Creator: Palter, Herman
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stability Limits and Burning Velocities of Laminar Hydrogen-Air Flames at Reduced Pressure

Description: Note presenting laminar burning velocity measured at pressures of 1 atmosphere and below and critical boundary velocity gradient for flashback at pressures below 1 atmosphere over a range of compositions for hydrogen-air burner flames. Pressure exponents of 0.23 for burning velocity and 1.35 for flashback velocity gradient was found. Results regarding blowoff and general stability loop, burning velocity, relations among various combustion properties, and reaction order from pressure exponents a… more
Date: November 1956
Creator: Fine, Burton
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laminar Boundary Layer With Heat Transfer on a Cone at Angle of Attack in a Supersonic Stream

Description: Note presenting the equations of the compressible laminar boundary layer for the windward streamline in the plane of symmetry of a yawed cone. Solutions are obtained for both insulated and cooled surfaces. The heat-transfer rate to this most windward streamline increases significantly with angle of attack.
Date: December 1957
Creator: Reshotko, Eli
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Wall Cooling on Inlet Parameters of a Scoop Operating in a Turbulent Boundary Layer on a Flat or Conical Surface for Mach Numbers 2 to 10

Description: Note presenting analytical results obtained for boundary-layer mass flow, momentum, total-temperature, and total-pressure recovery ratios of a scoop inlet with a height equal to the boundary-layer thickness and operating in a turbulent boundary layer, for flat and conical surfaces with wall cooling. The results indicate that design of boundary-layer intake devices or diverters must reflect the effects of wall cooling by either variable or compromised size.
Date: March 1958
Creator: Beke, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Note on the Aerodynamic Heating of an Oscillating Surface

Description: Note presenting an analysis of the temperature distributions in a fluid over an oscillating surface with heat transfer and associated heat-transfer parameters are compared with those for the case of conduction at a stationary surface with the same initial temperature potential. It was found that the heat transfer for the oscillating surface can be considerably different from that for conduction alone.
Date: April 1954
Creator: Ostrach, Simon
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some Linear Dynamics of Two-Spool Turbojet Engines

Description: Note presenting general equations for the linear responses of inner- and outer-spool speed to change in turbine-inlet temperature and exhaust-nozzle area are derived and evaluated from hypothetical two-spool-engine characteristics at design speed. Experimental corroboration of analysis is also provided in the form of response to fuel flow, response to exhaust-nozzle area, and response to turbine-inlet temperature are provided.
Date: June 1956
Creator: Novik, David
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laminar Boundary Layer Behind Shock Advancing Into Stationary Fluid

Description: Note presenting a study of the laminar compressible boundary layer induced by a shock wave advancing into a stationary fluid bounded by a wall. Velocity and temperature profiles, recovery factors, and skin-friction and heat-transfer coefficients are tabulated for a wide range of shock strengths.
Date: March 1955
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical investigation of the effect of water injection on supersonic turbojet-engine - inlet matching and thrust augmentation

Description: From Introduction: "In order to provide engine-inlet matching to prevent such mass flow spillage and the attendant drags, much mechanical complication has been introduced. References 1 and 2 propose employing this principle at subsonic and supersonic speeds to achieve thrust augmentation. The merits of the system for supersonic engine-inlet airflow matching, as well as thrust augmentation, appear considerable; and a comparative study with existing fixed- and variable-geometry inlets was theref… more
Date: January 1957
Creator: Beke, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Self-Balancing Line-Reversal Pyrometer

Description: Report presenting a description of a pyrometer that is self-balancing and is able to replace the two conventional manual operations of the line-reversal method. A description of the operation of the pyrometer and the performance and results are provided.
Date: August 1956
Creator: Buchele, Donald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of Parallel-Jet Mixing on Downstream Mach Number and Stagnation Pressure With Application to Engine Testing in Supersonic Tunnels

Description: "A one-dimensional analysis of the results of the parallel-jet mixing encountered in the testing of engines in supersonic wind tunnels is reported. Equations were derived for determining the totla pressure and Mach number behind the tunnel terminal shock. The method represents a simple procedure for determining these quantities while a tunnel is still in the design stage" (p. 1).
Date: March 1953
Creator: Bernstein, Harry
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laminar Natural-Convection Flow and Heat Transfer of Fluids With and Without Heat Sources in Channels With Constant Wall Temperatures

Description: Note presenting an analysis of the natural-convection phenomenon, which shows that the flow and heat transfer, in general, are not only functions of the Prandtl and Grashof numbers but also depend on a new dimensionless parameter. If the parameter is not negligibly small, the compression work and frictional heating may appreciably affect this mode of heat transfer. Results regarding the velocity and temperature distributions and heat transfer are provided.
Date: December 1952
Creator: Ostrach, Simon
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Laminar Free-Convection Flow and Heat Transfer About a Flat Plate Parallel to the Direction of the Generating Body Force

Description: From Introduction: "The problem of free-convection flow as produced by a body force about a flat plate in the direction of the body force was studied at the NACA Lewis laboratory and is treated in a formal and more general manner herein. The method used is somewhat similar to that used in reference 4 wherein consideration was given to the free-convection flow at high Grashof numbers in a horizontal cylinder which had a variable surface-temperature distribution. In addition, the numerical soluti… more
Date: February 1952
Creator: Ostrach, Simon
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Further Experiments on the Stability of Laminar and Turbulent Hydrogen-Air Flames at Reduced Pressures

Description: "Stability limits for laminar and turbulent hydrogen-air burner flames were measured as a function of pressure, burner diameter, and composition. On the basis of a simple flame model, turbulent flashback involved a smaller effective penetration distance than laminar flashback. No current theoretical treatment predicts the observed pressure and diameter dependence of laminar and turbulent blowoff" (p. 1).
Date: April 1957
Creator: Fine, Burton
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of Transient Pool Boiling Due to Sudden Large Power Surge

Description: Note presenting an investigation of the transfer of heat from a metallic ribbon to water, under transient conditions, for initial water temperatures from 76 to 203 degrees Fahrenheit and average heat-generation rates per square foot of square area of 3, 10, and 20x10(exp 5) Btu per hour per square foot. Results regarding the nucleate boiling region, film boiling region, and critical heat flux are provided.
Date: December 1956
Creator: Cole, Robert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aerodynamics of slender wings and wing-body combinations having swept trailing edges

Description: From Introduction: "In the present paper, a general method is developed for solving low-aspect-ratio problems involving shed vortex sheets. Both direct and inverse problems are considered. The method is applicable for all planar problems where the velocity boundary conditions can be made homogeneous by differentiation in either the streamwise or the spanwise directions."
Date: March 1954
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Theoretical and Experimental Analysis of One-Dimensional Compressible Flow in a Rotating Radial-Inlet Impeller Channel

Description: Note presenting an analysis of the one-dimensional compressible flow in a rotating radial-plane impeller channel conducted in order to provide an insight into the characteristics of the passage mean flow under the influence of centrifugal forces and losses.
Date: April 1952
Creator: Lieblein, Seymour
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Method for Determining the Need to Rework or Replace Compressor Rotor Blades Damaged by Foreign Objects

Description: Note presenting a method for deciding whether jet-engine compressor blades that have been nicked in service are safe from fatigue failure with continued engine operation. The method involves determining the vibratory stress distribution of the blades with damage inflicted in the laboratory. The method is judged to be a realistic criterion on inspecting damaged blades.
Date: September 1958
Creator: Kaufman, Albert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Combined Effect of Damping Screens and Streams Convergence on Turbulence

Description: Note presenting an analysis of the combined effect of a series of damping screens followed by an axisymmetric-stream convergence on the mean-square fluctuation-velocity intensities, scales, correlations, and one-dimensional spectra of a turbulence field convected by a main stream. Numerical results for the statistical quantities describing the turbulence field downstream of a screen-contraction configuration are obtained for the case of upstream isotropic turbulence.
Date: January 1953
Creator: Tucker, Maurice
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Approximate Theory for Calculation of Lift of Bodies, Afterbodies, and Combinations of Bodies

Description: Note presenting an expression developed for the lift of a slender afterbody in terms of the "slender-body" approximate potential at the after end in conjunction with a suitably calculated value of the potential at the forward end. The same expression is used to compute the part of the interference lift generated by the presence of a neighboring body, due to the interference upwash. The lift is determined for a cone-cylinder body, a cylindrical afterbody of a slender wing-body combination, and t… more
Date: April 1952
Creator: Moskowitz, Barry
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical relation for wake momentum thickness and diffusion ratio for low-speed compressor

Description: From Introduction: "The present report presents the derivation of a simple equation for blade-wake mometum thickness as a function of suction-surface diffusion ratio based on the one-dimensional boundary-layer mometum equation in conjunction with simplifying approximations."
Date: August 1958
Creator: Lieblein, Seymour
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Attenuation in a Shock Tube Due to Unsteady-Boundary-Layer Action

Description: "A method is presented for obtaining the attenuation of a shock wave in a shock tube due to the unsteady boundary layer along the shock-tube walls. It is assumed that the boundary layer is thin relative to the tube diameter and induces one-dimensional longitudinal pressure waves whose strength is proportional to the vertical velocity at the edge of the boundary layer. The contributions of the various regions in a shock tube to shock attenuation are indicated" (p. 1).
Date: August 1956
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interaction of a Free Flame Front With a Turbulence Field

Description: Note presenting the use of small-perturbation spectral-analysis techniques to obtain the root-mean-square flame-generated turbulence velocities and the attenuating pressure fluctuations stemming from interaction of a constant-pressure flame front with a field of isotropic turbulence in the absence of turbulence decay processes.
Date: March 1955
Creator: Tucker, Maurice
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stability Limits and Burning Velocities for Some Laminar and Turbulent Propane and Hydrogen Flames at Reduced Pressure

Description: Note presenting the effect of reduced pressure on blowoff, flashback, and burning velocities of propane-oxygen-nitrogen burner flames were studied. The pressure exponent of burning velocity, 0.22, was nearly the same as for hydrogen-air flames; stability loops showed the same blowoff and flashback characteristics as were previously observed for hydrogen-air flames. Of the two system, the hydrogen-air system showed larger burning velocity, greater stability toward reduced pressure, and higher re… more
Date: August 1957
Creator: Fine, Burton
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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