High Temperature Performance Evaluation Of A Hypersonic Engine Ceramic Wafer Seal
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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...
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...
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.
Evaluation And Ranking Of Candidate Ceramic Wafer Engine Seal Materials
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-02
Evaluation And Ranking Of Candidate Ceramic Wafer Engine Seal Materials 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 2018-07-02 with categories.
Modern engineered ceramics offer high temperature capabilities not found in even the best superalloy metals. The high temperature properties of several selected ceramics including aluminum oxide, silicon carbide, and silicon nitride are reviewed as they apply to hypersonic engine seal design. A ranking procedure is employed to objectively differentiate among four different monolithic ceramic materials considered, including: a cold-pressed and sintered aluminum oxide; a sintered alpha-phase silicon carbide; a hot-isostatically pressed silicon nitride; and a cold-pressed and sintered silicon nitride. This procedure is used to narrow the wide range of potential ceramics considered to an acceptable number for future detailed and costly analyses and tests. The materials are numerically scored according to their high temperature flexural strength; high temperature thermal conductivity; resistance to crack growth; resistance to high heating rates; fracture toughness; Weibull modulus; and finally according to their resistance to leakage flow, where materials having coefficients of thermal expansion closely matching the engine panel material resist leakage flow best. The cold-pressed and sintered material (Kyocera SN-251) ranked the highest in the overall ranking especially when implemented in engine panels made of low expansion rate materials being considered for the engine, including Incoloy and titanium alloys. Steinetz, Bruce M. Glenn Research Center RTOP 505-63-5B...
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1992-04
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-04 with Government publications categories.
Aeronautical Engineering
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Author :
language : en
Publisher:
Release Date : 1991
Aeronautical Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1992
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 1992 with Government publications categories.
Rotating Machinery 1992
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Author : Wen-Jei Yang
language : en
Publisher: Begell House Publishers
Release Date : 1993
Rotating Machinery 1992 written by Wen-Jei Yang and has been published by Begell House Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Technology & Engineering categories.
Modern rotating machines operate under more severe environments than in the past, and are required to produce increased output and to perform demanding tasks hitherto unforeseen. Better understanding, sophisticated testing and analysis, and accurate modeling of transport phenomena and dynamics are of paramount importance in predicting performance and improving the design of such machines. This two-volume set addresses these concerns and related design aspects of rotating machinery.
40th Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit July 11 14 2004 Fort Lauderdale Fl 04 3850 04 3899
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Author :
language : en
Publisher:
Release Date : 2004
40th Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit July 11 14 2004 Fort Lauderdale Fl 04 3850 04 3899 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Airplanes categories.
Nasa Tech Briefs
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Author :
language : en
Publisher:
Release Date : 1992
Nasa Tech Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Technology categories.