Two-dimensional Compressible Flow in Centrifugal Compressors with Logarithmic-spiral Blades
Two-dimensional Compressible Flow in Centrifugal Compressors with Logarithmic-spiral Blades

Author: Gaylord O. Ellis

Publisher:

Published: 1951

Total Pages: 54

ISBN-13:

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Two numerical examples are presented for two-dimensional, compressible, nonviscous flow in centrifugal compressors with backward-curved, logarithmic-spiral blades. The two examples are for different blade angles and are compared with a third example for straight, radial blades. The numerical results are presented in tables of the stream-function distribution and in plots of the streamlines, constant Mach number lines, and constant-pressure-ratio lines. In addition, a simplified analysis for logarithmic-spiral blades is presented that can be used to determine flow conditions within the impeller except near the imperller tip and impeller inlet.

The Spanwise Distribution of Lift for Minimum Induced Drag of Wings Having a Given Lift and a Given Bending Moment
The Spanwise Distribution of Lift for Minimum Induced Drag of Wings Having a Given Lift and a Given Bending Moment

Author: Robert T. Jones

Publisher:

Published: 1950

Total Pages: 708

ISBN-13:

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The problem of the minimum induced drag of wings having a given lift and a given span is extended to include cases in which the bending moment to be supported by the wing is also given. Expressions for the spanwise load distribution and the minimum drag in terms of the lateral position of the load centroid are given. The results show a 15-percent reduction of the induced drag with a 15-percent increase in span over that for an elliptic loading having the same total lift and bending moment.

Hovering Flight Tests of a Four-engine-transport Vertical Take-off Airplane Model Utilizing a Large Flap and Extensible Vanes for Redirecting the Propeller Slipstream
Hovering Flight Tests of a Four-engine-transport Vertical Take-off Airplane Model Utilizing a Large Flap and Extensible Vanes for Redirecting the Propeller Slipstream

Author: Louis P. Tosti

Publisher:

Published: 1955

Total Pages: 692

ISBN-13:

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An investigation of the take-off, landing, and hovering-flight characteristics of a four-engine-transport, vertical take-off airplane has been conducted with a remotely controlled free-flight model. The model had four propellers distributed along the wing with thrust axes parallel to the fuselage axis. In order to produce direct lift for hovering flight, the propeller slipstream was deflected downward about 70 degrees by a full-span 65-percent-chord flap deflected 90 degrees and eight extensible vanes arranged above the wing in a cascade relation.

Method of Matching Components and Predicting Performance of a Turbine-propeller Engine
Method of Matching Components and Predicting Performance of a Turbine-propeller Engine

Author: Alois T. Sutor

Publisher:

Published: 1951

Total Pages: 706

ISBN-13:

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Analytical expressions are derived to show the geometric, thermodynamic, and aerodynamic relations among compressor, turbine, and exhaust nozzle for a gas-turbine engine. For a known compressor performance map, a matching method is described to show some of the design compromises that must be made when the components are to be combined into a turbine-propeller engine. A method of predicting engine performance for a range of operating conditions from known component maps is presented. An illustrative example of the matching method and the performance analysis is presented, showing some of the practical limitations of engine operation.