A Study of a Supersonic Ejector Mixing Chamber PDF Download
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Author: George Einar Strand
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Book Description
An experimental investigation was performed to study the characteristics of the flow in a two-dimensional air ejector in which the center stream entered the mixing chamber at a Mach number of 1.90 while the velocity of the secondary flow was varied from zero to Mach 0.7. Mass flow ratios of the ejector were approximately equal when the pressures of the two streams were equal at the entrance to the mixing chamber. The chamber had a rectangular cross section and converged slightly; its length was equal to 16 times the width. Pressures measured at the walls and the centerline of the flow indicated that a maximum static pressure was reached at 8 widths of the chamber downstream of the nozzle when the flow was completely expanded at the nozzle exit. The maximum static pressure was achieved in less distance for the overexpanded condition and took longer for the underexpanded condition. The flow was always subsonic by the time the maximum pressure position was reached except in the underexpanded case, where the flow remained supersonic throughout the chamber and the maximum pressure was located at the exit to the chamber. (Author).
Author: George Einar Strand
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Book Description
An experimental investigation was performed to study the characteristics of the flow in a two-dimensional air ejector in which the center stream entered the mixing chamber at a Mach number of 1.90 while the velocity of the secondary flow was varied from zero to Mach 0.7. Mass flow ratios of the ejector were approximately equal when the pressures of the two streams were equal at the entrance to the mixing chamber. The chamber had a rectangular cross section and converged slightly; its length was equal to 16 times the width. Pressures measured at the walls and the centerline of the flow indicated that a maximum static pressure was reached at 8 widths of the chamber downstream of the nozzle when the flow was completely expanded at the nozzle exit. The maximum static pressure was achieved in less distance for the overexpanded condition and took longer for the underexpanded condition. The flow was always subsonic by the time the maximum pressure position was reached except in the underexpanded case, where the flow remained supersonic throughout the chamber and the maximum pressure was located at the exit to the chamber. (Author).
Author: George Einar Strand (CAPT, USAF.)
Publisher:
ISBN:
Category : Ejector pumps
Languages : en
Pages : 74
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Book Description
Author: V. A. Balanin
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
An experimental study was made to determine the effect of the mixing chamber length on the efficiency of the ejection process at a zero ejection coefficient. The experimental data and a diagram of the mixing chamber are shown. (Author).
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 204
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Book Description
;Contents: One-dimensional inviscid analysis of supersonic ejectors; Analysis and design method for ejector systems with second throat diffusers; The analysis of supersonic ejector systems; Ejector design for a variety of applications; Analysis of ducted mixing and burning of coaxial streams.
Author: Marion Dixon Browder
Publisher:
ISBN:
Category :
Languages : en
Pages : 62
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Book Description
Author: P. S. Barna
Publisher:
ISBN:
Category : Ejector pumps
Languages : en
Pages : 94
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Book Description
Author: I. I. Kalmykov
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The optimum configuration of a supersonic propelling nozzle for an air driven two stage ejector is selected experimentally. The nozzles tested were of the conical type with inlets and outlets of various design and with various lengths of the cylindrical portion of the throat. Nozzles with various expansion ratios were also tested. The nozzles were placed in the plane of the inlet section, along the axis, of a 5 degree conical mixing chamber (of the first stage). An analysis of the results indicated that an underexpanded mode of operation is optimum for the ejector nozzle. (Author).
Author: A. L. Addy
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
Only some general conclusions will be drawn in this section since specific conclusions were included in the foregoing sections. The conclusions are: (1) The constant-area ejector flow model and computer program should be adopted as the basis for design and system studies. This model most realistically predicts the operational characteristics of ejector systems. The relationship and correspondence between variable-area and constant-area mixing tube ejectors should be established by both experiment and analysis. (2) The analysis of variable-area mixing-tube ejectors should be continued. (3) The design of potential high-performance ejectors must improve mixing and momentum transfer; some designs with potential are: unsteady flow, periodic pulsating flow, resonance phenomena, and/or various nozzle and mixing-tube geometries. (4) The computer models developed in this study should be augmented and incorporated into an overall system program and further improvement of sub-system models should be continued.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 648
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Giuseppe Grazzini
Publisher: Springer
ISBN: 3319752448
Category : Technology & Engineering
Languages : en
Pages : 192
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Book Description
Encompassing both practical applications and recent research developments, this book takes the reader from fundamental physics, through cutting-edge new designs of ejectors for refrigeration. The authors’ unique vision marries successful design, system optimization, and operation experience with insights on the application of cutting-edge Computational Fluid Dynamics (CFD) models. This robust treatment leads the way forward in developing improved ejector technologies. The book covers ejectors used for heat powered refrigeration and for expansion work recovery in compression refrigerators, with special emphasis on two-phase flows of “natural” fluids within the ejector, i.e. steam and carbon dioxide. It features worked examples, detailed research results, and analysis tools.
