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Experimental Demonstration Of A 120 Mm Ram Accelerator
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Book Synopsis Experimental Demonstration of a 120-mm Ram Accelerator by :
Download or read book Experimental Demonstration of a 120-mm Ram Accelerator written by and published by . This book was released on 1996 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ram acceleration is an emerging propulsion technology in which a projectile similar in shape to the centerbody of a ramjet aircraft engine is injected at high speed into a tube filled with a combustible gaseous mixture. As the projectile moves into the tube, under supersonic conditions, shocks occur on and around the projectile. If the gases are then ignited, either by the energy in the shock system or an external mechanism, the combustion around or behind the projectile can be self-sustaining. The net effect is to generate a localized high-pressure region around and/or behind the projectile which produces acceleration. Work at the University of Washington, Seattle, has demonstrated velocities in excess of 2.6 km/s in 38-mm caliber, while theory predicts velocities above 7 km/s may be obtainable. The first successful ram acceleration experiment at 120-mm caliber is presented. Performance at this larger caliber was as predicted from scaling considerations. Reported experiments have shown that propellant mixing by partial pressure is a viable alternative to more complex mixing schemes for obtaining homogeneous propellant mixtures in ram accelerators. The usefulness of inert firings to analyze obturator performance and shock/pressure structure in ram accelerators has been further validated. Finally, the scaling potential of ram acceleration has been firmly established with the first successful test at 120-mm caliber.
Book Synopsis Experiments in a 120-mm Ram Accelerator at Elevated Pressures by :
Download or read book Experiments in a 120-mm Ram Accelerator at Elevated Pressures written by and published by . This book was released on 1996 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ram acceleration is an emerging propulsion technology in which a projectile similar in shape to the centerbody of a ramjet aircraft engine is injected into a tube filled with a combustible gaseous mixture. As the projectile moves into the tube under supersonic conditions, shocks occur on and around the projectile. If the gases ignite, the combustion can be self-sustaining, generating a localized high-pressure region that travels with the projectile producing acceleration. Velocities of more than 2.6 km/s have been experimentally demonstrated, while theory predicts velocities above 7 km/s are obtainable. The U.S. Army Research Laboratory (ARL) is studying the physics of the ram acceleration process through an integrated experimental and computational fluid dynamics effort. ARL operates the world's largest ram accelerator at 120-mm bore size. Initial experimental results at this facility are presented. In addition, data from experiments at gaseous fuel pressures up to 102 atm are presented. Impact of 'high pressure' operation on facility design and application are considered. Finally, future plans are summarized.
Book Synopsis New Experiments in a 120-mm Ram Accelerator at High Pressures by : D. L. Kruczynski
Download or read book New Experiments in a 120-mm Ram Accelerator at High Pressures written by D. L. Kruczynski and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hypervelocity Launchers by : Friedrich Seiler
Download or read book Hypervelocity Launchers written by Friedrich Seiler and published by Springer. This book was released on 2016-02-02 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present volume numerous descriptions of Ram accelerators are presented. These descriptions provide good overview on the progress made and the present state of the Ram accelerator technology worldwide. In addition, articles describing light gas gun, ballistic range including a chapter dealing with shock waves in solids are given. Along with the technical description of considered facilities, samples of obtained results are also included. Each chapter is written by an expert in the described topic providing a comprehensive description of the discussed phenomena.
Book Synopsis Experimental Analysis of Starting Dynamics at High Pressure Without Venting in a 120-mm Ram Accelerator by : D. L. Kruczynski
Download or read book Experimental Analysis of Starting Dynamics at High Pressure Without Venting in a 120-mm Ram Accelerator written by D. L. Kruczynski and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ram Accelerators by : Kazuyoshi Takayama
Download or read book Ram Accelerators written by Kazuyoshi Takayama and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ram accelerators are among the most advanced tools for generating fluid dynamcis data in supersonic reacting systems. They require the combined action of combustion, wave systems and turbulence and are still a serious challenge for physicists and engineers. This book will serve as an introductionary textbook on ram accelerators and gives a thorough overview on research activities, performance modeling and high-pressure detonation dynamics.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Performance Model and Initial Experimentation of a Baffled-tube Ram Accelerator by : Jeffrey F. Glusman
Download or read book Theoretical Performance Model and Initial Experimentation of a Baffled-tube Ram Accelerator written by Jeffrey F. Glusman and published by . This book was released on 2016 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The baffled-tube ram accelerator is an innovation in hypervelocity launch technology that allows the acceleration of axisymmetric projectiles in the velocity range of 500 to 3000 meters per second. This device has the potential to double the thrust performance of the conventional smooth-bore ram accelerator while reducing its minimum starting velocity. The baffled-tube ram accelerator utilizes a series of internal baffles to suppress the forward surge of a combustion driven shock wave, thus enabling operation in propellants having two to three times the energy release of those used with conventional smooth-bore ram accelerators. An experimental and theoretical investigation of this device is currently on-going at the University of Washington. Operation at velocities between 620 and 1220 meters per second has been demonstrated to date. Theoretical modeling indicates that momentum loss due to baffle interactions is a key factor in the baffled-tube ram accelerator, which reduces its performance. Nevertheless, baffled-tube experiments have demonstrated thrusts 30-100\% greater than that of a smooth-bore ram accelerator operating at the same fill pressure. The design, modeling, and experimental results from a 38-mm-bore, two-meter-long baffled-tube ram accelerator apparatus are presented.
Book Synopsis Computational Study of Flow Establishment in a Ram Accelerator by : Shaye Yungster
Download or read book Computational Study of Flow Establishment in a Ram Accelerator written by Shaye Yungster and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 30th AIAA/ASME/SAE/ASEE Joint Propulsion Conference by :
Download or read book 30th AIAA/ASME/SAE/ASEE Joint Propulsion Conference written by and published by . This book was released on 1994 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ARL Ballistics Research written by and published by . This book was released on 1993 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental and Theoretical Investigation of Single Stage Ram Accelerator Performance with Emphasis Towards Projectile Material Effects by : Barbrina Dunmire
Download or read book An Experimental and Theoretical Investigation of Single Stage Ram Accelerator Performance with Emphasis Towards Projectile Material Effects written by Barbrina Dunmire and published by . This book was released on 1991 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Symposium on Combustion in Supersonic Flows by : M. Champion
Download or read book IUTAM Symposium on Combustion in Supersonic Flows written by M. Champion and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the IUTAM Symposium held in Poitiers, France, 2-6 October 1995
Book Synopsis 40th AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 40th AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2002 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Ram Accelerator Concept Using an Optical Probe by : Kelley Ann Scott
Download or read book Experimental Investigation of Ram Accelerator Concept Using an Optical Probe written by Kelley Ann Scott and published by . This book was released on 1988 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Baffled Tube Ram Accelerator Operational Characteristics by : Colin Hugh Hambling
Download or read book Experimental Investigation of Baffled Tube Ram Accelerator Operational Characteristics written by Colin Hugh Hambling and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the baffled tube ram accelerator operational characteristics is presented. The ram accelerator is a novel hypervelocity launcher concept wherein a subcaliber projectile, as it travels through a stationary tube filled with a premixed fuel and oxidizer, initiates and sustains a combustion wave, generating continuous thrust. A quasi-steady, one-dimensional blackbox model is used to predict the acceleration, and thus, the thrust generation of the smooth bore thermally chocked ram accelerator propulsive mode. The baffled tube ram accelerator is a modern spin on the smooth bore ram accelerator. Designed to contain a forward surging combustion wave, the baffled tube ram accelerator permits the use of highly energetic propellants and, up to a certain degree, prevents the limiting condition of an unstart from occurring. Smooth bore ram accelerator operation is bound by three gas dynamic limits: a minimum Mach number required to keep the diffuser started, a minimum heat release required to keep the normal shock on the body, and lastly a maximum heat release beyond which the normal shock will be driven over the projectile. Due to the simple fact that the baffled tube ram accelerator is designed to expand these limits, difficulties arise when attempting to accurately predict the performance using the previously mentioned blackbox model. Prior experiments at the UW have attempted to develop a model better fit to understand operation in the baffled tube. This investigation is motivated by the need for empirical data to find correlation between performance models and experimental work, all with the intent to push the baffled tube ram accelerator closer to real-world applications. A new series of approximately 30 firings is presented to explore the unknown operational envelope of a methane/oxygen/nitrogen propellant mixture. Both entrance velocity of the projectile and heat release of the propellant were varied to map the initial experimental envelope of operation. Within the scope of this experimental investigation, the limits of the baffled tube ram accelerator running a methane/oxygen/nitrogen propellant mixture have been identified and the operational characteristics at and around these limits have been explored. Furthermore, concerns regarding the structural integrity of two-part and/or hollow projectiles were suppressed through a sub-series of experiments. This opened doors in to new possibilities for projectile design and configuration. Ultimately the results suggest the need for future work as the baffled tube ram accelerator envelope of operation has yet to be fully developed. However, the results also highlight great potential in the application of ram accelerators.***** An experimental investigation of the baffled tube ram accelerator operational characteristics is presented. The ram accelerator is a novel hypervelocity launcher concept wherein a subcaliber projectile, as it travels through a stationary tube filled with a premixed fuel and oxidizer, initiates and sustains a combustion wave, generating continuous thrust. A quasi-steady, one-dimensional blackbox model is used to predict the acceleration, and thus, the thrust generation of the smooth bore thermally chocked ram accelerator propulsive mode. The baffled tube ram accelerator is a modern spin on the smooth bore ram accelerator. Designed to contain a forward surging combustion wave, the baffled tube ram accelerator permits the use of highly energetic propellants and, up to a certain degree, prevents the limiting condition of an unstart from occurring. Smooth bore ram accelerator operation is bound by three gas dynamic limits: a minimum Mach number required to keep the diffuser started, a minimum heat release required to keep the normal shock on the body, and lastly a maximum heat release beyond which the normal shock will be driven over the projectile. Due to the simple fact that the baffled tube ram accelerator is designed to expand these limits, difficulties arise when attempting to accurately predict the performance using the previously mentioned blackbox model. Prior experiments at the UW have attempted to develop a model better fit to understand operation in the baffled tube. This investigation is motivated by the need for empirical data to find correlation between performance models and experimental work, all with the intent to push the baffled tube ram accelerator closer to real-world applications. A new series of approximately 30 firings is presented to explore the unknown operational envelope of a methane/oxygen/nitrogen propellant mixture. Both entrance velocity of the projectile and heat release of the propellant were varied to map the initial experimental envelope of operation. Within the scope of this experimental investigation, the limits of the baffled tube ram accelerator running a methane/oxygen/nitrogen propellant mixture have been identified and the operational characteristics at and around these limits have been explored. Furthermore, concerns regarding the structural integrity of two-part and/or hollow projectiles were suppressed through a sub-series of experiments. This opened doors in to new possibilities for projectile design and configuration. Ultimately the results suggest the need for future work as the baffled tube ram accelerator envelope of operation has yet to be fully developed. However, the results also highlight great potential in the application of ram accelerators.
Book Synopsis Experimental Investigation of High Pressure/performance Ram Accelerator Operation by : David L. Kruczynski
Download or read book Experimental Investigation of High Pressure/performance Ram Accelerator Operation written by David L. Kruczynski and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
