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Author : David L. Hammond
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (466 download)
Download or read book Thrust Augmenting Ejector Analysis Utilizing Compressible Flow Theory written by David L. Hammond and published by . This book was released on 1973 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohamed Moujahid
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (371 download)
Download or read book Compressible Flow Analysis of Thrust Augmenting Ejectors written by Mohamed Moujahid and published by . This book was released on 1995 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work was initiated due to the need for a method to understand and predict the thrust augmenting characteristics of jet ejectors."--Leaf iv.
Author : Morton Alperin
Publisher :
ISBN 13 :
Total Pages : 49 pages
Book Rating : 4.:/5 (228 download)
Download or read book Thrust Augmenting Ejectors written by Morton Alperin and published by . This book was released on 1981 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discussion of the development of the compact jet-diffuser ejectors utilized for hovering and low speed flight propulsion has been presented. This is followed by a description of ideal ejector performance as derived from a compressible flow theory, over the range of flight speeds from zero to supersonic speed. These analyses introduced the concepts of ejector configuration optimization and the validity of the so-called 'second solution' to the mixing problem, wherein the flow after complete mixing is supersonic. The ideal performance of thrust augmenting ejectors designed under this 'second solution' has been shown to be far superior to those designed by conventional methods. The ability of properly designed ejectors to utilize the thermal energy of injected gas for the production of useful energy has also been described. Finally, the influence of major losses has been discussed, including means for avoiding excessive performance degradation by proper optimization of the geometry of the ejector in view of these losses.
Author :
Publisher :
ISBN 13 :
Total Pages : 524 pages
Book Rating : 4.3/5 (126 download)
Download or read book Workshop on Thrust Augmenting Ejectors written by and published by . This book was released on 1979 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John C. Sanders
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (91 download)
Download or read book Analysis of Ejector Thrust by Integration of Calculated Surface Pressures written by John C. Sanders and published by . This book was released on 1949 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of the thrust of air ejectors was made for the purpose of revealing the nature of ejector action and the source of its thrust. Cases for both incompressible and compressible fluids were considered.
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781731496843
Total Pages : 170 pages
Book Rating : 4.4/5 (968 download)
Download or read book A Control-Volume Method for Analysis of Unsteady Thrust Augmenting Ejector Flows written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-21 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for predicting transient thrust augmenting ejector characteristics is presented. The analysis blends classic self-similar turbulent jet descriptions with a control volume mixing region discretization to solicit transient effects in a new way. Division of the ejector into an inlet, diffuser, and mixing region corresponds with the assumption of viscous-dominated phenomenon in the latter. Inlet and diffuser analyses are simplified by a quasi-steady analysis, justified by the assumptions that pressure is the forcing function in those regions. Details of the theoretical foundation, the solution algorithm, and sample calculations are given. Drummond, Colin K. COMPUTATIONAL FLUID DYNAMICS; COMPUTERIZED SIMULATION; EJECTORS; FINITE VOLUME METHOD; MATHEMATICAL MODELS; THRUST AUGMENTATION; TURBULENT JETS; UNSTEADY FLOW; ALGORITHMS; INLET FLOW; PREDICTION ANALYSIS TECHNIQUES; REAL TIME OPERATION...
Author : R. P. Braden
Publisher :
ISBN 13 :
Total Pages : 1094 pages
Book Rating : 4.3/5 (91 download)
Download or read book Proceedings written by R. P. Braden and published by . This book was released on 1982 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. M. Bevilaqua
Publisher :
ISBN 13 :
Total Pages : 55 pages
Book Rating : 4.:/5 (227 download)
Download or read book Viscid/Inviscid Interaction Analysis of Thrust Augmenting Ejectors written by P. M. Bevilaqua and published by . This book was released on 1978 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method has been developed for calculating the static performance of thrust augmenting ejectors by matching a viscous solution for the flow through the ejector to an inviscid solution for the flow outside the ejector. In effect, the ejector shroud is considered to be 'flying' in the secondary velocity field induced by the entrainment of the primary jets. A two-dimensional analysis utilizing a turbulence kinetic energy model for the inner, jet mixing solution and potential flow singularities for the outer, induced flow is described. This approach offers the advantage of including external influences on the flow through the ejector. Comparisons with data are presented for an ejector having a single central nozzle and Coanda jets on the walls. The accuracy of the matched solution is found to be especially sensitive to the jet flap effect of the flow just downstream of the ejector exit. (Author).
Author : Hidayat Wiradimadja
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)
Download or read book Experimental Investigation of a Thrust Augmenting Ejector written by Hidayat Wiradimadja and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ejector is basically a jet pump in which the kinetic energy of the jet is made to impart motion to the fluid surrounding it. During this process, in a well design system, the ejector as a whole experiences a thrust much higher than that of the jet alone. In principle, an ejector is nothing but a jet surrounded by a shroud. This investigation concerns the performance of a two- dimensional ejector with its primary jet excited by a novel method. A constant area duct was used in this experiment. The velocity of the jet at the exit was subsonic. Maximum thrust was obtained when the ejector to jet exit area ratio was about 35. Under this condition a thrust augmentation ratio of 1.65 was achieved, with the jet excited at 20 Hz, whereas without excitation it was only 1.40. The mixing characteristics of the jet under excitation was examined using flow visualization techniques. Smoke filaments illuminated by a sheet of powerful light and schlieren optics with the jet heated were used. Excitation of the jet was found to generate large vortex-like flow structures which might be responsible for enhanced mixing. These vortices extended to considerable distances on both sides of the jet.
Author : Tsze C. Tai
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (536 download)
Download or read book Analysis and Design of Ejector Diffuser for Optimum Thrust written by Tsze C. Tai and published by . This book was released on 1976 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in jet ejectors operating under static conditions have produced high thrust augmentation that is feasible for application to V/STOL flight. However, because of (a) loss in augmentation in duct flow, (b) ramjet effect, and (c) space limitations, high performance and compactness are required in the design of thrust-augmenting ejectors for V/STOL aircraft. An analytical inverse approach is presented in which the pressure distribution along the diffuser wall of an ejector is defined for a given entrance flow condition and the contour of the desired diffuser wall is determined by using a finite difference technique. The prescribed pressure distribution is first optimized by a modified Stratford criterion for incipient separation of turbulent boundary layers; this optimization makes it applicable to compressible two-dimensional and axisymmetric flows.
Author :
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. M. Bevilaqua
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (228 download)
Download or read book Theory and Practice of Ejector Scaling written by P. M. Bevilaqua and published by . This book was released on 1982 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Procedures are described for utilizing scale models for the development of thrust augmenting ejectors. Physical reasoning and the methods of dimensional analysis are used to argue that the Mach numbers must be matched, but that the Reynolds number is not a relevant parameter if its value is large. Numerical analysis is used to show that almost no change in performance may be expected from the use of cold air jets. Experimental data is presented to support these results. Thus, it is concluded that scale model ejectors powered by cold jets provide a close approximation to the performance of full size ejectors powered by hot jet exhaust flows.
Author : Wendell S. Hertzelle
Publisher :
ISBN 13 : 9781423568032
Total Pages : 92 pages
Book Rating : 4.5/5 (68 download)
Download or read book Applicability of Thrust Augmenting Ejectors in a Supersonic Cruise Configuration written by Wendell S. Hertzelle and published by . This book was released on 1997-04-01 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thrust augmenting ejectors were analyzed by the author in an attempt to see if they could be used to provide a significant thrust increase over the baseline thrust of a primary core. This was done for the purpose of determining if leaving the ejectors open in the cruise configuration of the High Speed Civil Transport would lead to a thrust increase that would at least offset the weight of the ejectors themselves. If this was found to be true then the fuel economy of the HSCT might be improved by leaving them open and not closing them during cruise. In analyzing the ejectors, no assumptions were made regarding inlet nor outlet configurations, so an attempt was made to find the point of optimal thrust augmentation by varying secondary stream bypass Mach number and the amount of flow entrainment. Two solutions were found to each mixing scenario, one subsonic and the other supersonic. These two solutions were each analyzed and ones not satisfying the Second Law of Thermodynamics were eliminated. Analytic diffuser and bleed losses were also explored in the analysis of the ejector flow. Within the limitations of the assumptions discussed in this paper, appreciable thrust augmentations have been discovered over a large range of bypass Mach numbers and entrained mass flows. This lead the author to the conclusion that ejectors warrant further research beyond a first order analysis, and serious thought should be put into leaving them open in cruise.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781726160919
Total Pages : 30 pages
Book Rating : 4.1/5 (69 download)
Download or read book A Simple Model of Pulsed Ejector Thrust Augmentation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-29 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple model of thrust augmentation from a pulsed source is described. In the model it is assumed that the flow into the ejector is quasi-steady, and can be calculated using potential flow techniques. The velocity of the flow is related to the speed of the starting vortex ring formed by the jet. The vortex ring properties are obtained from the slug model, knowing the jet diameter, speed and slug length. The model, when combined with experimental results, predicts an optimum ejector radius for thrust augmentation. Data on pulsed ejector performance for comparison with the model was obtained using a shrouded Hartmann-Sprenger tube as the pulsed jet source. A statistical experiment, in which ejector length, diameter, and nose radius were independent parameters, was performed at four different frequencies. These frequencies corresponded to four different slug length to diameter ratios, two below cut-off, and two above. Comparison of the model with the experimental data showed reasonable agreement. Maximum pulsed thrust augmentation is shown to occur for a pulsed source with slug length to diameter ratio equal to the cut-off value.Wilson, Jack and Deloof, Richard L. (Technical Monitor)Glenn Research CenterTHRUST AUGMENTATION; MATHEMATICAL MODELS; FLOW VELOCITY; HARTMANN-SPRENGER TUBES; VORTEX RINGS; PULSED JET ENGINES; EJECTORS...
Author : Mark A. Corbo
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.:/5 (229 download)
Download or read book Analysis of Compressible Flow Ejectors Utilized as Jet Pumps written by Mark A. Corbo and published by . This book was released on 1990 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. M. Abdel-Fattah
Publisher :
ISBN 13 : 9780642108364
Total Pages : 5 pages
Book Rating : 4.1/5 (83 download)
Download or read book A Theoretical Study of Two Stage Thrust Augmenting Ejectors written by A. M. Abdel-Fattah and published by . This book was released on 1984 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of theoretical assessment of two stage thrust augmenting ejectors are presented and compared with those of single stage ejectors. The mixing ducts were of constant cross sectional area, the flows at the inlet and exit planes of each stage were assumed to be uniform, and friction effects were ignored. It was found that staging the ejector increases thrust augmentation at all primary jet stagnation pressures, but is more effective in the low pressure range and with high ejector area ratios for any gas combination. With a Hot Rocket-Air combination, the benefit of staging is much less than with an unheated Air-Air combination, and does not appear to be of practical use.
Author : Paul Allen Van
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (3 download)
Download or read book Performance of Thrust Augmenting Ejectors written by Paul Allen Van and published by . This book was released on 1971 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
