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Analysis of laminar incompressible flow on semiporous channels

Description: From Introduction: "Experimental results for flow in a rectangular channel with injection through a porous wall are given in reference 1. As part of the study to guide future experiments, laminar flow in a semiporous channel is investigated herein. In the present investigation, a third-order perturbation solution for laminar incompressible flow in a semiporous channel is presented."
Date: August 1956
Creator: Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Analysis of coolant flow and pressure requirements for a return-flow turbine rotor blade design using hydrogen, helium, or air as coolant

Description: From Introduction: "This report presents the results of an analysis to determine the coolant flow and pressure requirements for a particular return-flow turbine rooter blade design utilizing hydrogen, helium, or air as the coolant."
Date: May 7, 1957
Creator: Slone, Henry O. & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Exact solutions of laminar-boundary-layer equations with constant property values for porous wall with variable temperature

Description: From Summary: "Exact solution of the laminar-boundary-layer equations for wedge-type flow with constant property values are presented for transpiration-cooled surfaces with variable wall temperatures. The difference between wall and stream temperature is assumed proportional to a power of the distance from the leading edge. Solutions are given for a Prandtl number of 0.7 and ranges of pressure-gradient, cooling-air-flow, and wall-temperature-gradient parameters. Boundary-layer profiles, dimensionless boundary-layer thicknesses, and convective heat-transfer coefficients are given in both tabular and graphical form. Corresponding results for constant wall temperature and for impermeable surfaces are included for comparison purposes."
Date: July 15, 1954
Creator: Donoughe, Patrick L. & Livingood, John N. B.
Partner: UNT Libraries Government Documents Department

Extension of boundary-layer heat-transfer theory to cooled turbine blades

Description: An equation for average heat transfer of a surface was derived when the boundary layer changed from laminar to turbulent. Influences on the heat transfer through a laminar boundary layer of Mach number, temperature ratio (gas temperature divided by wall temperature), and exponents of gas-property temperature relations were shown to be relatively small for air with Mach numbers less than 2 and temperature ratios between 1 and 4. Good agreement was obtained with experimental results from cylinders, an airfoil, and turbine blades.
Date: August 11, 1950
Creator: Brown, W. Byron & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Tables of exact laminar-boundary-layer solutions when the wall is porous and fluid properties are variable

Description: Report presenting the three partial differential equations of the laminar boundary layer for two-dimensional steady-state compressible flow, which have been transformed into two ordinary differential equations by the method of Pohlhausen, Falkner, and Skan. A total of 58 cases have been solved numerically by the method of Picard. For each of the cases, the displacement, momentum, and convection thicknesses, as well as Nusselt number and coefficient of friction at the wall, were computed.
Date: September 1951
Creator: Brown, W. Byron & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Exploratory engine test of transpiration-cooled turbine-rotor blade with wire-cloth shell

Description: Engine tests were made on a transpiration-cooled blade that was fabricated from an internal load-carrying member with an external surface of wire cloth. After operation in the engine, some damage was noted at the tip region of the trailing edge of the blades. On other sections of the blade, the wire cloth did not appear greatly overheated, and it appeared that satisfactory chordwise temperature distribution was provided by orifices in the blade base.
Date: January 20, 1954
Creator: Donoughe, Patrick L. & Diaguila, Anthony J.
Partner: UNT Libraries Government Documents Department

Flow Coefficients for Orifices in Base of Transpiration-Cooled Turbine Rotor Blade

Description: Static tests on a segment of a transpiration-cooled turbine rotor blade with a wire-cloth shell were conducted to determine the flow coefficients associated with some representative metering orifices. Average flow coefficients from 0.96 to 0.79 were obtained for orifices of 0.031 to 0.102 inch diameter.
Date: December 11, 1953
Creator: Donoughe, Patrick L. & Prasse, Ernst I.
Partner: UNT Libraries Government Documents Department

Pressure distributions about finite wedges in bounded and unbounded subsonic streams

Description: An analytical investigation of incompressible flow about wedges was made to determine effects of tunnel-wedge ratio and wedge angle on the wedge pressure distributions. The region of applicability of infinite wedge-type velocity distribution was examined for finite wedges. Theoretical and experimental pressure coefficients for various tunnel-wedge ratios, wedge angles, and subsonic Mach numbers were compared.
Date: May 1953
Creator: Donoughe, Patrick L. & Prasse, Ernst I.
Partner: UNT Libraries Government Documents Department

Experimental investigation of air-flow uniformity and pressure level on wire cloth for transpiration-cooling applications

Description: Report presenting an investigation of the problem of producing uniform air flow through a calendered or cold-rolled sheet of brazed stainless-steel corduroy wire cloth on 20x250 mesh cloth in regions of low permeability. The effect of exit level was determined at several exit level pressures on three different types of mesh wire cloth. Results regarding airflow uniformity for calendered wire cloth, effect of exit pressure or pressure level on air flow, and permeability and strength of 20x200 mesh wire cloth are provided.
Date: January 1956
Creator: Donoughe, Patrick L. & McKinnon, Roy A.
Partner: UNT Libraries Government Documents Department

Design of two transpiration-cooled strut-supported turbine rotor blades

Description: Report presenting the design details of two transpiration-cooled strut-supported turbine rotor blades. One design uses a sintered blade shell while the other uses a wire blade shell. Ideal coolant flows were found for an effective gas temperature of 1425 degrees Fahrenheit, a coolant temperature of 180 degrees Fahrenheit, and a shell temperature of 600 degrees Fahrenheit.
Date: April 25, 1956
Creator: Prasse, Ernst I.; Livingood, John N. B. & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Summary of laminar-boundary-layer solutions for wedge-type flow over convection-and transpiration-cooled surfaces

Description: Report presenting a summary of exact solutions of the laminar-boundary-layer equations for wedge-type flow, which are useful in estimating heat transfer to arbitrarily shaped bodies like turbine blades. The solutions are determined for small Mach numbers and for two cases: small temperature changes in the boundary layer along a constant- and variable-temperature wall, and large temperature changes in the boundary layer along a constant-temperature wall. Results regarding boundary-layer profiles and friction and heat transfer are provided.
Date: December 1955
Creator: Livingood, John N. B. & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Experiments on turbulent flow through channels having porous rough surfaces with or without air injection

Description: Report examining the use of transpiration cooling as a method to cool different structural elements such as turbine blades or the walls of combustion chambers in jet engines and parts of the skin of missiles. In some of the applications, the surface roughness inherently connected with a porous material may exceed the limit for which a surface is considered as hydraulically smooth.
Date: February 1955
Creator: Eckert, E. R. G.; Diaguila, Anthony J. & Donoughe, Patrick L.
Partner: UNT Libraries Government Documents Department

Velocity and friction characteristics of laminar viscous boundary-layer and channel flow over surfaces with ejection or suction

Description: Report presenting some information on flow characteristics - velocity field, pressure drop, and friction - for steady, fully developed laminar flow through a duct consisting of two parallel walls, for flow throguh tubes with circular cross section, and for boundary-layer flow over infinite wedges. In order to determine the extent to which the boundary conditions imposed o the flow by the various geometries influence the flow characteristics, dimensionless parameters common to both channel and boundary-layer flow were developed.
Date: December 1957
Creator: Eckert, E. R. G.; Donoughe, Patrick L. & Moore, Betty Jo
Partner: UNT Libraries Government Documents Department