Download or read book Simulation of Pyrolysis gas Flow Through a Char Layer During Ablation written by Ronald K. Clark and published by . This book was released on 1969 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Pyrolysis gas Flow Through a Char Layer During Ablation written by Ronald K. Clark and published by . This book was released on 1969 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multidimensional Gas Flow Through Permeable Char Layers and Its Effects on Ablation written by Harold G. Bush and published by . This book was released on 1969 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical analysis of the pressure fields within the char layers of cylindrical and hemispherical ablation models is presented. The distribution over the surface of mass flow from the char layer is given for both geometries. These multidimensional mass-flow distributions show that gas flow through the char layer can be significantly different from the one-dimensional assumption previously used by ablation analysts. Further, the theoretical results show that it is possible for the external pressure field to cause gas flow into the char layer, in which case the diffusion of energy and oxygen through the boundary layer to the material surface is increased. The appropriate analytical results were used to modify an existing one-dimensional ablation computer program to make convective blocking at the ablator surface responsive to the major parameters governing mass flow through permeable char layers. A comparison of analytical and experimental results shows that ablation performance can be significantly affected by multidimensional mass flow through the char layer.
Download or read book On Chemical Reactions in the Char Zone During Ablation written by Gary C. April and published by . This book was released on 1971 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Pyrolysis Gas in a Charring Ablative Thermal Protection Material Using Gas Injection Through a Porous Graphite Sample written by Benton Robb Greene and published by . This book was released on 2018 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: When a spacecraft traveling at orbital speeds enters a planetary atmosphere, shock waves and friction heat the surrounding air to temperatures in excess of 6,000 K. Often the only way to protect the spacecraft structure is to insulate it with a layer of sacrificial material that absorbs the heat by thermally degrading and ablating away. As the interior of the material heats up, it pyrolyzes into gaseous byproducts which are expelled through the charred surface of the material and provide an extra buffer between the hot free stream and the spacecraft. The performance of these charring ablative materials depends on poorly understood chemical, thermal, and mass flow interactions of the material with the superheated free stream fluid. The current work characterizes the flow and operating range of a new inductively coupled plasma based high enthalpy flow facility for testing high-temperature thermal protection materials. The facility uses magnetic induction to heat up to 1.5 g/s of air to temperatures of between 5000 K and 6500 K. The flow uniformity, total enthalpy and heat flux of the plasma stream are measured. Raman spectroscopy is used to measure the gas temperature within the flow and calculate an enthalpy distribution. The facility is used to investigate the effect that injection of ablation products into the boundary layer has on the heat flux into the material and mass loss rate of the char surface. The ablation process is simulated by injecting a gas mixture through a FiberForm test sample so that the flow and composition of pyrolysis products, which usually depend on the specific material composition, can be varied independently. It was found that all gas compositions tested reduced the rate of surface recession and chemically reactive mixtures reduced it the most. Emission spectroscopy in the boundary layer showed the mechanism to be reduced oxygen diffusion to the surface. However, if the heat of combustion of the pyrolysis products was too high, the heat flux to the surface was not reduced. For materials with above a 60% char yield, pyrolysis gases have little effect.
Download or read book NASA Technical Note written by and published by . This book was released on 1973 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1966 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Selected Listing of NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1970 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1970 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports and Publications for 1969 A Selected Listing written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1970 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Simulation written by Joseph C. Richmond and published by . This book was released on 1970 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanotechnology Commercialization written by Thomas O. Mensah and published by John Wiley & Sons. This book was released on 2017-11-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fascinating and informative look at state-of-the-art nanotechnology research, worldwide, and its vast commercial potential Nanotechnology Commercialization: Manufacturing Processes and Products presents a detailed look at the state of the art in nanotechnology and explores key issues that must still be addressed in order to successfully commercialize that vital technology. Written by a team of distinguished experts in the field, it covers a range of applications notably: military, space, and commercial transport applications, as well as applications for missiles, aircraft, aerospace, and commercial transport systems. The drive to advance the frontiers of nanotechnology has become a major global initiative with profound economic, military, and environmental implications. Nanotechnology has tremendous commercial and economic implications with a projected $ 1.2 trillion-dollar global market. This book describes current research in the field and details its commercial potential—from work bench to market. Examines the state of the art in nanotechnology and explores key issues surrounding its commercialization Takes a real-world approach, with chapters written from a practical viewpoint, detailing the latest research and considering its potential commercial and defense applications Presents the current research and proposed applications of nanotechnology in such a way as to stimulate further research and development of new applications Written by an all-star team of experts, including pioneer patent-holders and award-winning researchers in nanotechnology The major challenge currently faced by researchers in nanotechnology is successfully transitioning laboratory research into viable commercial products for the 21st century. Written for professionals across an array of research and engineering disciplines, Nanotechnology Commercialization: Manufacturing Processes and Products does much to help them bridge the gap between lab and marketplace.
Download or read book NASA SP written by and published by . This book was released on 1970 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1970 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Cracking of Phenolic nylon Pyrolysis Products on Passing Through a Heated Char written by George F. Sykes and published by . This book was released on 1970 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pyrolysis products were generated by flash pyrolysis of the heat-shield material in front of the heated char and were analyzed, after passing through the char, by gas chromatography. The change in composition of the pyrolysis products after passing through the char showed that the high molecular weight products cracked to lower molecular weight products, beginning at about '700' C. The low molecular weight products were found to increase with increasing char temperature and, at char temperatures approaching 1000° C, the pyrolysis gases were composed of carbon dioxide, carbon monoxide, water, methane, hydrogen, acetylene, benzene, and cyclopentanone.
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
