Method of designing cascade blades with prescribed velocity distributions in compressible potential flows

Method of designing cascade blades with prescribed velocity distributions in compressible potential flows

Date: January 1, 1950
Creator: Costello, George R
Description: By use of the assumption that the pressure-volume relation is linear, a solution to the problem of designing a cascade for a given turning and with a prescribed velocity distribution along the blade in a potential flow of a compressible perfect fluid was obtained by a method of correspondence between potential flows of compressible and incompressible fluids. The designing of an isolated airfoil with a prescribed velocity distribution along the airfoil is considered as a special case of cascade. If the prescribed velocity distribution is not theoretically attainable, the method provides a means of modifying the distribution so as to obtain a physically significant blade shape. Numerical examples are included.
Contributing Partner: UNT Libraries Government Documents Department
Statutory Interpretation: General Principles and Recent Trends

Statutory Interpretation: General Principles and Recent Trends

Date: August 3, 2001
Creator: Costello, George
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Legislative Powers of Congress: A Brief Reference Guide

Legislative Powers of Congress: A Brief Reference Guide

Date: May 13, 1998
Creator: Costello, George
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Supreme Court's Overruling of Constitutional Precedent: An Overview

The Supreme Court's Overruling of Constitutional Precedent: An Overview

Date: November 29, 2005
Creator: Costello, George
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Statutory Interpretation: General Principles and Recent Trends

Statutory Interpretation: General Principles and Recent Trends

Date: March 30, 2006
Creator: Costello, George
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Supreme Court Opinions: October 2004 Term

Supreme Court Opinions: October 2004 Term

Date: July 27, 2005
Creator: Costello, George
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Possible application of blade boundary-layer control to improvement of design and off-design performance of axial-flow turbomachines

Possible application of blade boundary-layer control to improvement of design and off-design performance of axial-flow turbomachines

Date: May 1, 1951
Creator: Sinnette, John T , Jr & Costello, George R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Smoke studies of secondary flows in bends, tandem cascades, and high-turning configurations

Smoke studies of secondary flows in bends, tandem cascades, and high-turning configurations

Date: March 11, 1953
Creator: Hansen, Arthur G; Costello, George R & Herzig, Howard Z
Description: Flow-visualization studies, using smoke, were made of the secondary flows in rectangular bends, tandem cascades, and high-turning configurations. The roll-up of the wall boundary layer of a rectangular bend forms a passage vortex near the suction surface similar to that previously observed for cascades. The vortex so formed then shifts out into the main stream. Because of leading-edge effects, the boundary-layer flows in bends were found to be sufficiently different from the flows in blade rows to make direct application of bend results to blade rows inadvisable. Passage vortices are shown, in the tandem-cascade study, to resist turning with the main stream through which they pass and to disturb the flow in subsequent blade rows. This disturbance may explain in part the appreciable size of the losses sometimes attributed to secondary flows in turbomachines despite the fact that the energy involvement in vortex formation is slight. Tip-flow studies of high-turning blades with relative motion between blades and end wall indicated that if the relative sizes of the passage vortex forces, the tip clearance forces, and the blade-scraping effects are properly controlled, it may be possible to improve the blade-tip loading characteristics in turbomachine.
Contributing Partner: UNT Libraries Government Documents Department
Detailed computational procedure for design of cascade blades with prescribed velocity distributions in compressible potential flows

Detailed computational procedure for design of cascade blades with prescribed velocity distributions in compressible potential flows

Date: January 1, 1952
Creator: Costello, George R; Cummings, Robert L & Sinnette, John T , Jr
Description: A detailed step-by-step computational outline is presented for the design of two-dimensional cascade blades having a prescribed velocity distribution on the blade in a potential flow of the usual compressible fluid. The outline is based on the assumption that the magnitude of the velocity in the flow of the usual compressible nonviscous fluid is proportional to the magnitude of the velocity in the flow of a compressible nonviscous fluid with linear pressure-volume relation.
Contributing Partner: UNT Libraries Government Documents Department
A visualization study of secondary flows in cascades

A visualization study of secondary flows in cascades

Date: January 1, 1954
Creator: Herzig, Howard Z; Hansen, Arthur G & Costello, George R
Description: Flow-visualization techniques are employed to ascertain the streamline patterns of the nonpotential secondary flows in the boundary layers of cascades, and thereby to provide a basis for more extended analyses in turbomachines. The three-dimensional deflection of the end-wall boundary layer results in the formation of a vortex within each cascade passage. The size and tightness of the vortex generated depend upon the main-flow turning in the cascade passage. Once formed, a vortex resists turning in subsequent blade rows, with consequent unfavorable angles of attack and possible flow disturbances on the pressure surfaces of subsequent blade rows when the vortices impinge on these surfaces. Two major tip-clearance effects are observed, the formation of a tip-clearance vortex and the scraping effect of a blade with relative motion past the wall boundary layer. The flow patterns indicate methods for improving the blade tip-loading characteristics of compressors and of low- and high-speed turbulence.
Contributing Partner: UNT Libraries Government Documents Department
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