Methods of Designing Cascade Blades with Prescribed Velocity Distributions in Compressible Potential Flows PDF Download
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Author: George R. Costello
Publisher:
ISBN:
Category : Cascades (Fluid dynamics)
Languages : en
Pages : 30
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Book Description
If the prescribed velocity distribution is not theoretically attainable, the method gives a way of modifying the distribution so as to obtain a blade shape.
Author: George R. Costello
Publisher:
ISBN:
Category : Cascades (Fluid dynamics)
Languages : en
Pages : 30
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Book Description
If the prescribed velocity distribution is not theoretically attainable, the method gives a way of modifying the distribution so as to obtain a blade shape.
Author: George R. Costello
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 56
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Book Description
The computational procedure includes several ways of adjusting the prescribed velocity to satisfy the restriction imposed by the method. Tables of coefficients are given for evaluating the necessary integrals, including the determination of the harmonic conjugate. Numerical examples are included.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1026
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 486
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 606
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Book Description
Author: John Stanitz
Publisher: Рипол Классик
ISBN: 5881585658
Category : History
Languages : en
Pages : 79
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Book Description
An approximate blade-element design method is developed for compressible or incompressible nonviscous flow in high-solidity stators or rotors of axial-, radial-, or mixed-flow compressors, turbines, or two-dimensinal cascades. The method is based upon channel-type flow between blade elements on a specified surface of revolution that lies between the hub and shroud (casing) and is concentric with the axis of the compressor turbine. The blade elements is designed for prescribed velocities along the blade-element profile as a function of distance along meridonal lines on the surface of revolution. Two numerical examples are presented: (1) the design of a blade-element profile for a plane two-dimensional cascade in compressible flow with the prescribed velocities along the profiles; and (2) the design of a blade element for the impeller of a mixed-flow centrifugal compressor.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 578
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Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 498
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Book Description
Author: George G. Edwards
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 658
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Book Description
An investigation has been conducted at speeds up to a Mach number of 0.90 to determine the effects of operating propellers on the longitudinal characteristics of a four-engine tractor airplane configuration having a 40 degrees swept wing with an aspect ratio of 10. Results of wind-tunnel tests of a model representing such an airplane configuration (see NACA TN 3789) show that these effects are of most concern in the low-speed high-thrust flight regime. In the present report the low-speed data are analyzed to determine the source of the various effects and to indicate how the adverse effects can be reduced, and the high-speed data are discussed primarily from the standpoint of Mach number effects. The analysis of the low-speed data indicates that the large variations of longitudinal stabil.itywith angle of attack resulted primarily from passage of the tail into and out of the slipstream. The slipstream also created large lift increments on the wing, particularly with flaps deflected, which resulted in increases in stability (with increasing thrust coefficient) from the outboard propeller and decreases in stability from the inboard propeller. It was concluded that the longitudinal stabiltty characteristics of the model couldbe improved by moving the nacelles outward, increasing the tail height, and reducing the tail span.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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