Download or read book An Experimental Investigation of the Structure of High Reynolds Number Supersonic Jets written by Stephen Andrew Arnette and published by . This book was released on 1992 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Large scale Structures in High Reynolds Number Supersonic Jets written by J. Lepicovsky and published by . This book was released on 1985 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow structure of a 50.8 mm (2 in) diameter jet operated at a full expanded Mach number of 1.37, with Reynolds numbers in the range 1.7 to 2.35 million, was examined for the first 20 jet diameters. To facilitate the study of the large scale structure, and determine any coherence, a discrete tone acoustic excitation method was used. Phase locked flow visualization as well as laser velocimeter quantitative measurements were made. The main conclusions derived from this study are: (1) large scale coherent like turbulence structures do exist in large Reynolds number supersonic jets, and they prevail even beyond the potential core; (2) the most preferential Strouhal number for these structures is in the vicinity of 0.4; and (3) quantitatively, the peak amplitudes of these structures are rather low, and are about 1% of the jet exit velocity. Finally, since a number of unique problems related to LV measurements in supersonic jets were encountered, a summary of these problems and lessons learned therefrom are also reported.
Download or read book Coherent Large scale Structures in High Reynolds Number Supersonic Jets written by and published by . This book was released on 1985 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Supersonic Rectangular Over expanded Nozzle of Single and Two phase Flows written by and published by . This book was released on 2008 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the results of an experimental investigation and analysis of the supersonic rectangular over-expanded flow of single and two-phase flows. Recent interest in rectangular supersonic jets is motivated by the need to reduce plume length and acoustically excited structural loads in the exhaust system of high performance aircrafts. Semi-periodic shock structures form in the jet plumes of these vehicles during low speed flight at off design conditions. These shock cells affect the jet velocity and temperature decay as well as the jet spread rate and its acoustic field. The flow regimes and shock structure in the plume was characterized for jets in quiescent atmosphere at over-expanded conditions. Instantaneous and phase average schlieren/shadowgraph images of the internal flow and the jets are presented to show the over-expanded shock structure and jet spread rate at different nozzle pressure ratios ranged from 1.6 to 9.5. A high-pressure particle feeders have been constructed to steady feed the dispersed large particles and the seeding particle for LDA measurements at different particle loading rates. Schlieren pictures of the jets are presented to show the shock structure and jet spread rate. LDV measurements are presented for the jet flow field and the centerline velocity decay. The results indicate that the rectangular supersonic jet spread rate is greater along the minor axis and increases with the nozzle pressure ratio. The individual shock cell length, as well as, the total number of shock cells within the jet plume were found to increase with nozzle pressure ratio. In two-phase rectangular jets of gas and dispersed solid particles the shock strength was found to attenuate with increased particle loading. The design, construction and initial shakedown of the facility has been accomplished. The effort required to reach this stage has been greater than initially expected. Further more detailed data acquisitions and measurements will be accomplished in future studies.
Download or read book An Experimental Investigation of Large Scale Instabilities in a Low Reynolds Number Two stream Supersonic Shear Layer written by Dennis K. McLaughlin and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Differences Between Reynolds Averaged and Favre Averaged Velocity in Supersonic Jets written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advancement in the molecular Rayleigh scattering based technique allowed for simultaneous measurement of velocity and density fluctuations with high sampling rates. The technique was used to investigate unheated high subsonic and supersonic fully expanded free jets in the Mach number range of 0.8 to 1.8. The difference between the Favre averaged and Reynolds averaged axial velocity and axial component of the turbulent kinetic energy is found to be small. Estimates based on the Morkovin's "Strong Reynolds Analogy" were found to provide lower values of turbulent density fluctuations than the measured data.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Experimental Aerodynamics written by Mrinal Kaushik and published by Springer. This book was released on 2018-12-15 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as a text for undergraduate and graduate courses in aerodynamics, typically offered to students of aerospace and mechanical engineering programs. It covers all aspects of aerodynamics. The book begins with a description of the standard atmosphere and basic concepts, then moves on to cover the equations and mathematical models used to describe and characterize flow fields, as well as their thermodynamic aspects and applications. Specific emphasis is placed on the relation between concepts and their use in aircraft design. Additional topics of interest to the reader are presented in the Appendix, which draws on the teachings provided in the text. The book is written in an easy to understand manner, with pedagogical aids such as chapter overviews, summaries, and descriptive and objective questions to help students evaluate their progress. Atmospheric and gas tables are provided to facilitate problem solving. Lastly, a detailed bibliography is included at the end of each chapter to provide students with further resources. The book can also be used as a text for professional development courses in aerodynamics.
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Technology Objectives and Plans Summary RTOPS written by and published by . This book was released on 1985 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Screech Noise Generation written by J. Panda and published by . This book was released on 1996 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Fluid Structure Interactions in Supersonic Flows written by Santosh Vaibhav Varigonda and published by . This book was released on 2022 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supersonic High Reynolds Number Flow Over a Tangent Ogive Cylinder at Small Angles of Attack An Experimental Study and Comparison with Theory written by D. S. Dolling and published by . This book was released on 1979 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was made of flow over a tangent ogive cylinder model at small angle of attack. The model was approximately 10 calibers (50cm, 20in.) long with a 3 caliber nose. Surface pressure distributions have been measured in both the circumferential and axial directions and boundary layer pitot surveys made at four stations along with wind and lee sides of the cylinder. Over the entire angle of attack range tested, 0 through 5 deg, no boundary layer separation was observed. All the measurements were made at a nominal freestream Mach number of 3, a unit Reynolds number of 6.2 x 10 to the 7th power/m (1.6 million/in.) and with near adiabatic wall conditions. At these high Reynolds numbers, natural boundary layer transition occurred, and in all cases was observed close to the nose tip. The measurements were compared with predictions from a boundary layer based computer code developed by Sturek, et al, at the U.S. Army Ballistic Research Laboratories. Pressure distributions agree well with the predictions. The experimental and computed velocity profiles have some common trends but there exist significant discrepancies between them. In a general sense, the computed and measured profiles have fundamentally different shapes and their downstream development is not accurately modelled, particularly on the windside.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP written by and published by . This book was released on 1991 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
