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Applicability Of Thrust Augmenting Ejectors In A Supersonic Cruise Configuration
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Book Synopsis Applicability of Thrust Augmenting Ejectors in a Supersonic Cruise Configuration by : Wendell S. Hertzelle
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.
Book Synopsis Applicability of Thrust Augmentation Ejectors in a Supersonic Cruise Configuration by : Wendell Scott Hertzelle
Download or read book Applicability of Thrust Augmentation Ejectors in a Supersonic Cruise Configuration written by Wendell Scott Hertzelle and published by . This book was released on 1996 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Workshop on Thrust Augmenting Ejectors by :
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:
Book Synopsis Thrust Augmenting Ejectors by : Morton Alperin
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.
Book Synopsis A Review of Several Propulsion Integration Features Applicable to Supersonic-cruise Fighter Aircraft by : B. L. Berrier
Download or read book A Review of Several Propulsion Integration Features Applicable to Supersonic-cruise Fighter Aircraft written by B. L. Berrier and published by . This book was released on 1976 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thrust Augmentation Study of High Performance Ejectors by : John E. Minardi
Download or read book Thrust Augmentation Study of High Performance Ejectors written by John E. Minardi and published by . This book was released on 1983 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique is developed for determining a representative value of the maximum efficiency that can be achieved with high performance ejectors when operating on the supersonic solution branch of an ejector. These efficiencies are used to calculate thrust augmentation for an ejector over a wide range of parameters including operation with a hypothetical engine. Reasonable values of thrust augmentation can be achieved at low subsonic flight mach numbers. However, at flight Mach numbers near one, little or not thrust augmentation was found. At supersonic flight Mach numbers, thrust augmentation was achieved. Basic studies indicated that the effects of temperature was opposite at subsonic and supersonic flight Mach numbers. Thrust augmentation decreased with increasing temperature at subsonic Mach number sand increased with increasing temperature at supersonic Mach numbers.
Book Synopsis Investigation of Convergent-divergent Nozzles Applicable to Reduced-power Supersonic Cruise Aircraft by : Bobby L. Berrier
Download or read book Investigation of Convergent-divergent Nozzles Applicable to Reduced-power Supersonic Cruise Aircraft written by Bobby L. Berrier and published by . This book was released on 1980 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thrust Augmentation Considerations for Stol and Extended Cruise Propulsion by : William S. Campbell
Download or read book Thrust Augmentation Considerations for Stol and Extended Cruise Propulsion written by William S. Campbell and published by . This book was released on 1969 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of thrust augmentation concepts to short take-off and landing (STOL) aircraft propulsion is described for some typical installations. Aerodynamic and ejector thrust effects are treated separately so that the performance of the ejector-powered wing can be calculated as that of a jet-flapped airfoil and the ejector thrust components then added. Some considerations on the performance of the ejector-powered wing in cruise are included. A program for ejector calculations is given. (Author).
Book Synopsis Inlet and Diffuser Effects on Thrust Augmenting Ejectors by : S. G. Reznick
Download or read book Inlet and Diffuser Effects on Thrust Augmenting Ejectors written by S. G. Reznick and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of primary jet inlet nozzle configuration and diffuser geometry on the thrust augmentation of circular and rectangular ejectors are investigated in an experimental study. The rectangular ejector inlet nozzle configurations consist of either one, two, or three slot nozzles. The circular ejector inlet nozzles consist of slot nozzles placed either across the inlet or around the inlet periphery. Diffuser geometry is varied primarily by changing the diffuser area ratio. Effect on thrust performance of the primary flow injection angle relative to the inlet walls is investigated. Effects of side-wall, end-wall, and diffuser blowing on thrust performance and diffuser stall also are considered.
Book Synopsis Ejector Thrust Augmentation Lift Systems for Supersonic V/STOL Aircraft by : James M. Farley
Download or read book Ejector Thrust Augmentation Lift Systems for Supersonic V/STOL Aircraft written by James M. Farley and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Thrust Augmentation Study of High Performance Ejectors by :
Download or read book Thrust Augmentation Study of High Performance Ejectors written by and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique is developed for determining a representative value of the maximum efficiency that can be achieved with high performance ejectors when operating on the supersonic solution branch of an ejector. These efficiencies are used to calculate thrust augmentation for an ejector over a wide range of parameters including operation with a hypothetical engine. Reasonable values of thrust augmentation can be achieved at low subsonic flight mach numbers. However, at flight Mach numbers near one, little or not thrust augmentation was found. At supersonic flight Mach numbers, thrust augmentation was achieved. Basic studies indicated that the effects of temperature was opposite at subsonic and supersonic flight Mach numbers. Thrust augmentation decreased with increasing temperature at subsonic Mach number sand increased with increasing temperature at supersonic Mach numbers.
Book Synopsis Analysis and Design of Ejector Diffuser for Optimum Thrust by : Tsze C. Tai
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.
Book Synopsis Experiments on High Speed Ejectors by :
Download or read book Experiments on High Speed Ejectors written by and published by . This book was released on 198? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies were conducted to investigate the flow and the performance of thrust augmenting ejectors for flight mach numbers in the range of 0.5 to 0.8, primary air stagnation pressures up to 107 psig (738 kPa), and primary air stagnation temperatures up to 1250 F (677 C). The experiment verified the existence of the second solution ejector flow, where the flow after complete mixing is supersonic. Thrust augmentation in excess of 1.2 was demonstrated for both hot and cold primary jets. The experimental ejector performed better than the corresponding theoretical optimal first solution ejector, where the mixed flow is subsonic. Further studies are required to realize the full potential of the second solution ejector. Keywords: Thrust augmentation; Jet mixing flow; Supersonic flow; Subsonic flight; Transonic flight. (EDC).
Book Synopsis Effect of Exit Area Variation on the Performance of an Auxiliary Inlet Ejector Nozzle at Mach Numbers from 0 to 1.27 by : Bernard J. Blaha
Download or read book Effect of Exit Area Variation on the Performance of an Auxiliary Inlet Ejector Nozzle at Mach Numbers from 0 to 1.27 written by Bernard J. Blaha and published by . This book was released on 1971 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Three-Dimensional Thrust-Augmenting Ejectors by : Ramesh K. Agarwal
Download or read book Study of Three-Dimensional Thrust-Augmenting Ejectors written by Ramesh K. Agarwal and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theory is presented for the prediction of thrust augmentation characteristics of a three-dimensional ejector configuration in which a series of rectangular-hypermixing nozzles pumps the secondary air in a constant-area or slowly diverging channel. Based on the theory, a computer program is developed which requires the ejector design parameters, the empirical constants in the eddy viscosity model, and the nozzle pressure ratio as input and calculates the entrained secondary mass flow, the secondary and exit velocities, the net thrust and the thrust augmentation ratio. Good agreement is found between the theoretical prediction and the experimental data.
Book Synopsis Static Performance of an Auxiliary Inlet Ejector Nozzle Using an Afterburning Turbojet Gas Generator by : Richard R. Burley
Download or read book Static Performance of an Auxiliary Inlet Ejector Nozzle Using an Afterburning Turbojet Gas Generator written by Richard R. Burley and published by . This book was released on 1970 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
