A Base Drag Reduction Experiment on the X-33 Linear Aerospike SR-71 Experiment (LASRE) Flight Program

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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Base Drag Reduction Experiment on the X-33 Linear Aerospike SR-71 Experiment (LASRE) Flight Program by : Stephen A. Whitmore

Download or read book A Base Drag Reduction Experiment on the X-33 Linear Aerospike SR-71 Experiment (LASRE) Flight Program written by Stephen A. Whitmore and published by . This book was released on 1999 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag reduction tests were conducted on the LASRE/X-33 flight experiment. The LASRE experiment is a flight test of a roughly 20-percent scale model of an X-33 forebody with a single aerospike engine at the rear. The experiment apparatus is mounted on top of an SR-71 aircraft. This paper suggests a method for reducing base drag by adding surface roughness along the forebody. Calculations show a potential for base drag reductions of 8 to 14 percent. Flight results corroborate the base drag reduction, with actual reductions of 15 percent in the high-subsonic flight regime. An unexpected result of this experiment is that drag benefits were shown to persist well into the supersonic flight regime. Flight results show no overall net drag reduction. Applied surface roughness causes forebody pressures to rise and offset base drag reductions. Apparently the grit displaced streamlines outward, causing forebody compression. Results of the LASRE drag experiments are inconclusive and more work is needed. Clearly, however, the forebody grit application works as a viable drag reduction tool.

A Base Drag Reduction Experiment on the X-33 Linear Aerospike Sr-71 Experiment (Lasre) Flight Program

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Publisher : Independently Published
ISBN 13 : 9781724003317
Total Pages : 36 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis A Base Drag Reduction Experiment on the X-33 Linear Aerospike Sr-71 Experiment (Lasre) Flight Program by : National Aeronautics and Space Adm Nasa

Download or read book A Base Drag Reduction Experiment on the X-33 Linear Aerospike Sr-71 Experiment (Lasre) Flight Program written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-25 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drag reduction tests were conducted on the LASRE/X-33 flight experiment. The LASRE experiment is a flight test of a roughly 20% scale model of an X-33 forebody with a single aerospike engine at the rear. The experiment apparatus is mounted on top of an SR-71 aircraft. This paper suggests a method for reducing base drag by adding surface roughness along the forebody. Calculations show a potential for base drag reductions of 8-14%. Flight results corroborate the base drag reduction, with actual reductions of 15% in the high-subsonic flight regime. An unexpected result of this experiment is that drag benefits were shown to persist well into the supersonic flight regime. Flight results show no overall net drag reduction. Applied surface roughness causes forebody pressures to rise and offset base drag reductions. Apparently the grit displaced streamlines outward, causing forebody compression. Results of the LASRE drag experiments are inconclusive and more work is needed. Clearly, however, the forebody grit application works as a viable drag reduction tool. Whitmore, Stephen A. and Moes, Timothy R. Armstrong Flight Research Center NASA/TM-1999-206575, H-2333, NAS 1.15:206575, AIAA Paper 99-0277

Aerodynamic Assessment of Flight-Determined Subsonic Lift and Drag Characteristics of Seven Lifting-Body and Wing-Body Reentry Vehicle Configurations

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ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Aerodynamic Assessment of Flight-Determined Subsonic Lift and Drag Characteristics of Seven Lifting-Body and Wing-Body Reentry Vehicle Configurations by : Edwin J. Saltzman

Download or read book Aerodynamic Assessment of Flight-Determined Subsonic Lift and Drag Characteristics of Seven Lifting-Body and Wing-Body Reentry Vehicle Configurations written by Edwin J. Saltzman and published by . This book was released on 2002 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Real-time Method for Estimating Viscous Forebody Drag Coefficients

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ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Real-time Method for Estimating Viscous Forebody Drag Coefficients by : Stephen A. Whitmore

Download or read book A Real-time Method for Estimating Viscous Forebody Drag Coefficients written by Stephen A. Whitmore and published by . This book was released on 2000 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper develops a real-time method based on the law of the wake for estimating forebody skin-friction coefficients. The incompressible law-of-the-wake equations are numerically integrated across the boundary layer depth to develop an engineering model that relates longitudinally averaged skin-friction coefficients to local boundary layer thickness. Solutions applicable to smooth surfaces with pressure gradients and rough surfaces with negligible pressure gradients are presented. Model accuracy is evaluated by comparing model predictions with previously measured flight data. This integral law procedure is beneficial in that skin-friction coefficients can be indirectly evaluated in real-time using a single boundary layer height measurement. In this concept a reference pitot probe is inserted into the flow, well above the anticipated maximum thickness of the local boundary layer. Another probe is servomechanism-driven and floats within the boundary layer. A controller regulates the position of the floating probe. The measured servomechanism of this second probe provides an indirect measurement of both local and longitudinally averaged skin friction. Simulation results showing the performance of the control law for a noisy boundary layer are then presented.

NASA Tech Briefs

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ISBN 13 :
Total Pages : 1004 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis NASA Tech Briefs by :

Download or read book NASA Tech Briefs written by and published by . This book was released on 1999 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flight Testing the Linear Aerospike SR-71 Experiment (LASRE)

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Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Flight Testing the Linear Aerospike SR-71 Experiment (LASRE) by : Stephen Corda

Download or read book Flight Testing the Linear Aerospike SR-71 Experiment (LASRE) written by Stephen Corda and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of the next generation of space access vehicles has led to a unique flight test that blends the space and flight research worlds. The new vehicle designs, such as the X-33 vehicle and Reusable Launch Vehicle (RLV) are powered by linear aerospike rocket engines. Conceived of in the 1960's, these aerospike engines have yet to be flown, and many questions remain regarding aerospike engine performance and efficiency in flight. To provide some of these data before flying on the X-33 vehicle and the RLV, a spacecraft rocket engine had been flight-tested atop the NASA SR-71 aircraft as the Linear Aerospike SR-71 Experiment (LASRE). A 20 percent-scale, semispan model of the X-33 vehicle, the aerospike engine, and all the required fuel and oxidizer tanks and propellant feed systems have been mounted atop the SR-71 airplane for this experiment. A major technical objective of the LASRE flight test is to obtain installed-engine performance flight data for comparison to wind-tunnel results and for the development of computational fluid dynamics-based design methodologies. The ultimate goal of firing the aerospike rocket engine in flight is still forthcoming. An extensive design and development phase of the experiment hardware has been completed, including approximately 40 ground tests. Five flights of the LASRE and firing the rocket engine using inert liquid nitrogen and helium in place of liquid oxygen and hydrogen have been successfully completed.

The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains

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Publisher : Springer Science & Business Media
ISBN 13 : 354044419X
Total Pages : 534 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains by : Rose McCallen

Download or read book The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains written by Rose McCallen and published by Springer Science & Business Media. This book was released on 2013-07-30 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is our pleasure to present these proceedings from the United Engineering Foundation Conference on The Aerodynamics of Heavy Vehicles: Trucks, Buses and Trains held December 2-6, 2002, in Monterey, California. This Department of Energy, United Engineering Foundation, and industry sponsored conference brought together 90 leading engineering researchers from around the world to discuss the aerodynamic drag of heavy vehicles. Participants from national labs, academia, and industry, including truck manufacturers, discussed how computer simulation and experimental techniques could be used to design more fuel efficient trucks, buses, and trains. Conference topics included comparison of computational fluid dynamics calculations using both steady and unsteady Reynolds-averaged Navier-Stokes, large-eddy simulation, and hybrid turbulence models and experimental data obtained from the Department of Energy sponsored and other wind tunnel experiments. Advanced experimental techniques including three-dimensional particle image velocimetry were presented, along with their use in evaluating drag reduction devices. We would like to thank the UEF conference organizers for their dedication and quick response to sudden deadlines. In addition, we would like to thank all session chairs, the scientific advisory committee, authors, and reviewers for their many hours of dedicated effort that contributed to a successful conference and resulted in this document of the conference proceedings. We also gratefully acknowledge the support received from the United Engineering Foundation, the US Department of Energy, Lawrence Livermore National Laboratory, Volvo Trucks America, International Truck and Engine Corporation, and Freightliner LLC.

Research Engineering

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ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Research Engineering by :

Download or read book Research Engineering written by and published by . This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fairing Well

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ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Fairing Well by : Christian Gelzer

Download or read book Fairing Well written by Christian Gelzer and published by . This book was released on 2011 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Monthly Catalog of United States Government Publications

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ISBN 13 :
Total Pages : 1154 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Monthly Catalog of United States Government Publications by :

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1999-07 with total page 1154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

37th AIAA Aerospace Sciences Meeting and Exhibit

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ISBN 13 :
Total Pages : 714 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis 37th AIAA Aerospace Sciences Meeting and Exhibit by :

Download or read book 37th AIAA Aerospace Sciences Meeting and Exhibit written by and published by . This book was released on 1999 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Aerospace Abstracts

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ISBN 13 :
Total Pages : 974 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Beamed Energy Propulsion

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Publisher : American Institute of Physics
ISBN 13 : 9780735401754
Total Pages : 586 pages
Book Rating : 4.4/5 (17 download)

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Book Synopsis Beamed Energy Propulsion by : Kimiya Komurasaki

Download or read book Beamed Energy Propulsion written by Kimiya Komurasaki and published by American Institute of Physics. This book was released on 2004-04-02 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the Second International Symposium on Beamed Energy Propulsion demonstrated that this field is getting more active and has advanced considerably since last year. Japan demonstrated a microwave rocket using a 1MW gyrotron and China produced a laser launcher. Topics include: fluid dynamics in laser propulsion; ablative laser propulsion; microwave propulsion; mission proposal and analysis; hybrid systems and new concepts; beam transmission and reception; beam generation.

Applied Mechanics Reviews

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ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.3/5 (243 download)

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Download or read book Applied Mechanics Reviews written by and published by . This book was released on 2000 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Propulsion Flight Research at NASA Dryden From 1967 to 1997

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ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Propulsion Flight Research at NASA Dryden From 1967 to 1997 by : Frank W. Burcham (Jr.)

Download or read book Propulsion Flight Research at NASA Dryden From 1967 to 1997 written by Frank W. Burcham (Jr.) and published by . This book was released on 1998 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

AIAA Aerospace Sciences Meeting and Exhibit, 42nd

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ISBN 13 :
Total Pages : 532 pages
Book Rating : 4.0/5 ( download)

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Download or read book AIAA Aerospace Sciences Meeting and Exhibit, 42nd written by and published by . This book was released on 2004 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit

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ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit by :

Download or read book 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit written by and published by . This book was released on 1998 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: