Further Investigations Of Hypersonic Engine Seals
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Further Investigations Of Hypersonic Engine Seals
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-21
Further Investigations Of Hypersonic Engine Seals written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-21 with categories.
Durable, flexible sliding seals are required in advanced hypersonic engines to seal the perimeters of movable engine ramps for efficient, safe operation in high heat flux environments at temperatures of 2000 to 2500 F. Current seal designs do not meet the demanding requirements for future engines, so NASA's Glenn Research Center is developing advanced seals and preloading devices to overcome these shortfalls. An advanced ceramic wafer seal design and two silicon nitride compression spring designs were evaluated in a series of compression, scrub, and flow tests. Silicon nitride wafer seals survived 2000 in. (50.8 m) of scrubbing at 2000 F against a silicon carbide rub surface with no chips or signs of damage. Flow rates measured for the wafers before and after scrubbing were almost identical and were up to 32 times lower than those recorded for the best braided rope seal flow blockers. Silicon nitride compression springs showed promise conceptually as potential seal preload devices to help maintain seal resiliency. Dunlap, Patrick H., Jr. and Steinetz, Bruce M. and DeMange, Jeffrey J. Glenn Research Center NASA/TM-2004-213188, E-14687, AIAA Paper 2004-3887
Toward An Improved Hypersonic Engine Seal
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-20
Toward An Improved Hypersonic Engine Seal written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-20 with categories.
High temperature, dynamic seals are required in advanced engines to seal the perimeters of movable engine ramps for efficient, safe operation in high heat flux environments at temperatures from 2000 to 2500 F. Current seal designs do not meet the demanding requirements for future engines, so NASA s Glenn Research Center (GRC) is developing advanced seals to overcome these shortfalls. Two seal designs and two types of seal preloading devices were evaluated in a series of compression tests at room temperature and 2000 F and flow tests at room temperature. Both seals lost resiliency with repeated load cycling at room temperature and 2000 F, but seals with braided cores were significantly more flexible than those with cores composed of uniaxial ceramic fibers. Flow rates for the seals with cores of uniaxial fibers were lower than those for the seals with braided cores. Canted coil springs and silicon nitride compression springs showed promise conceptually as potential seal preloading devices to help maintain seal resiliency. Dunlap, Patrick H., Jr. and Steinetz, Bruce M. and DeMange,Jeffrey J. and Taylor, Shawn C. Glenn Research Center NASA/TM-2003-212531, E-14093, NAS 1.15:212531, AIAA Paper 2003-4834
Design Study Of Wafer Seals For Future Hypersonic Vehicles
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-24
Design Study Of Wafer Seals For Future Hypersonic Vehicles written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-24 with categories.
Future hypersonic vehicles require high temperature, dynamic seals in advanced hypersonic engines and on the vehicle airframe to seal the perimeters of movable panels, flaps, and doors. Current seals do not meet the demanding requirements of these applications, so NASA Glenn Research Center is developing improved designs to overcome these shortfalls. An advanced ceramic wafer seal design has shown promise in meeting these needs. Results from a design of experiments study performed on this seal revealed that several installation variables played a role in determining the amount of leakage past the seals. Lower leakage rates were achieved by using a tighter groove width around the seals, a higher seal preload, a tighter wafer height tolerance, and a looser groove length. During flow testing, a seal activating pressure acting behind the wafers combined with simulated vibrations to seat the seals more effectively against the sealing surface and produce lower leakage rates. A seal geometry study revealed comparable leakage for full-scale wafers with 0.125 and 0.25 in. thicknesses. For applications in which lower part counts are desired, fewer 0.25-in.-thick wafers may be able to be used in place of 0.125-in.-thick wafers while achieving similar performance. Tests performed on wafers with a rounded edge (0.5 in. radius) in contact with the sealing surface resulted in flow rates twice as high as those for wafers with a flat edge. Half-size wafers had leakage rates approximately three times higher than those for full-size wafers. Dunlap, Patrick H. and Finkbeiner, Joshua R. and Steinetz, Bruce M. and DeMange, Jeffrey J. Glenn Research Center NASA/TM-2005-213858, E-15228, AIAA Paper 2005-4153
Design Study Of Wafer Seals For Future Hypersonic Vehicles
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Author :
language : en
Publisher:
Release Date : 2005
Design Study Of Wafer Seals For Future Hypersonic Vehicles written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Proceedings Of The 2022 International Conference On Smart Manufacturing And Material Processing Smmp2022
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Author : A. Nayyar
language : en
Publisher: IOS Press
Release Date : 2022-11-29
Proceedings Of The 2022 International Conference On Smart Manufacturing And Material Processing Smmp2022 written by A. Nayyar and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-29 with Technology & Engineering categories.
Smart manufacturing is a broad category of manufacturing that employs computer-integration, high levels of adaptability and rapid design changes, together with digital information technology and a technically-trained workforce. This book presents the proceedings of SMMP2022, the 2022 International Conference on Smart Manufacturing and Material Processing, held on 12 and 13 August 2022 as a virtual event due to continuing restrictions related to the COVID-19 pandemic, and hosted from Shanghai, China. The conference provides a platform for researchers and scientists from smart manufacturing and material sciences to come together with researchers from various other application areas to discuss problems and solutions, identify new issues, and shape future directions for research. The conference received 60 submissions. These were submitted to a rigorous peer review process by a committee of experts from various disciplines, after which, 23 were accepted for presentation at the conference and publication here. The topics covered include materials processing and product manufacture, sensors and smart material systems, functional materials, industrial automation and process control, and discussion of the state-of-the-art and future direction of smart manufacturing and material sciences. Providing an overview of current developments in smart manufacturing and material processing, the book will be of interest to all those working in the field.
Research Technology 2004
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Author :
language : en
Publisher: DIANE Publishing
Release Date :
Research Technology 2004 written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
A Test Fixture For Measuring High Temperature Hypersonic Engine Seal Performance
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-10
A Test Fixture For Measuring High Temperature Hypersonic Engine Seal Performance written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-10 with categories.
A test fixture for measuring the performance of several high temperature engine seal concepts was installed at the NASA Lewis Research Center. The test fixture was developed to evaluate seal concepts under development for advanced hypersonic engines such as those being considered for the National Aerospace Plane. The fixture can measure static seal leakage performance from room temperature up to 1500 F and air pressure differentials up to 100 psi. Performance of the seals can be measured while sealing against flat or engine simulated distorted walls, where distortions can be as large as 0.150 in. in only an 18 in. span. The fixture is designed to evaluate seals 3 feet long, a typical engine panel length. The seal channel can be configured to test square, circular, or rectangular seals that are nominally 0.5 in. high. The sensitivity of leakage performance to lateral or axial loading can also be measured using specially designed high temperature lateral and axial bellows preload systems. Leakage data for a candidate ceramic wafer engine seal is provided by way of example to demonstrate the test fixture's capabilities. Steinetz, Bruce M. Glenn Research Center NASA-TM-103658, E-5780, NAS 1.15:103658 RTOP 505-63-1B...
41st Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit 10 13 July 2005 Tucson Arizona 05 4150 05 4199
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Author :
language : en
Publisher:
Release Date : 2005
41st Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit 10 13 July 2005 Tucson Arizona 05 4150 05 4199 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Airplanes categories.
High Temperature Performance Evaluation Of A Hypersonic Engine Ceramic Wafer Seal
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-05
High Temperature Performance Evaluation Of A Hypersonic Engine Ceramic Wafer Seal written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-05 with categories.
Leakage rates of an innovative hypersonic engine seal were measured using a specially developed static high temperature seal test fixture at NASA Lewis Research Center. The three foot long structural panel-edge seal is designed to minimize leakage of high temperature, high pressure gases past the movable panels of advanced ramjet/scramjet engines. The seal is made of a stack of precision machined ceramic wafer pieces that are inserted into a closely conforming seal channel in the movable engine panel. The wafer seal accommodates the significant distortions in the adjacent engine walls through relative sliding between adjacent wafers. Seal leakage rates are presented for engine simulated air temperatures up to 1350 F and for engine pressures up to 100 psi. Leakage rates are also presented for the seal, sealing both a flat wall condition, and an engine simulated distorted wall condition in which the distortion was 0.15 in. in only an 18 in. span. Seal leakage rates were low, meeting an industry-established tentative leakage limit for all combinations of temperature, pressure, and wall conditions considered. Comparisons are made between the measured leakage rates and leakage rates predicted using a seal leakage model developed from externally-pressurized gas film bearing theory. Steinetz, Bruce M. Glenn Research Center RTOP 505-63-5B...
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1994
Monthly Catalogue United States Public Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Government publications categories.