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An Analysis Of A Charring Ablation Thermal Protection System
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Book Synopsis An Analysis of a Charring Ablation Thermal Protection System by : Donald M. Curry
Download or read book An Analysis of a Charring Ablation Thermal Protection System written by Donald M. Curry and published by . This book was released on 1965 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical model is presented for predicting the transient one-dimensional thermal performance of a charring-ablator heat-protection system when exposed to a hyperthermal environment. The heat-protection system is considered to consist of a ablation material and backup structure. The ablating material is further considered to consist of three distinct regions or zones: char, reacting, and virgin material. A FORTRAN IV digital computer program (STAB II) utilizing an implicit finite difference formulation has been written for the IBM 709/40 computer system. The program considers one ablating material and a maximum of 12 back- up materials with conduction or radiation and/or convection allowed between materials. Thermal properties of all materials are temperature dependent, with the properties of the charring material also being state dependent. The governing differential equations and their implicit finite difference formulation are presented. The program input and output are described in detail. The FORTRAN program statements and nomenclature are presented. Also, the theoretical and experimental results are compared.
Book Synopsis An Analysis of a Charring Ablation Thermal Protection System by : Donald M. Curry
Download or read book An Analysis of a Charring Ablation Thermal Protection System written by Donald M. Curry and published by . This book was released on 1965 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Parametric Study of a Low-density Charring Ablator by : Stephen Stern Tompkins
Download or read book Parametric Study of a Low-density Charring Ablator written by Stephen Stern Tompkins and published by . This book was released on 1966 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterisation of Ablative Thermal Protection System Materials Through Analysis and Inverse Methods by : Sara Pavesi
Download or read book Characterisation of Ablative Thermal Protection System Materials Through Analysis and Inverse Methods written by Sara Pavesi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The complex and non-linear nature of ablation processes makes a systematic comparative analysis of ablators a challenging task. Within this thesis work, several approachesare adopted to investigate the ablative material performance and thermodynamics of the ablation process. Contemporary European ablators tested at IRS, together with already flown ablators, are analyzed and compared with respect to their performance. From this analysis, several considerations for an ablative thermal protection system performance optimization are formulated and discussed. Furthermore, a method for solving in-depth and surface energy equations and deriving a first approximation of the weight of each energy term is presented. A physical model which divides a charring ablator into different layers based on the thermochemical processes occurring withineach layer is adopted. Interpolating pyrometric and thermocouples measurements, spatial and temporal temperature distributions of lightweight ZURAM are evaluated.This ablator is developed by the German Aerospace Center in Stuttgart and tested under relevant re-entry conditions. From the resulting temperature profiles, partial derivatives terms of the in-depth energy equations are estimated for each layer and, consequently, the energy equations are solved. This method enables to evaluate energy terms which are generally difficult to assess due to the high complex natureof the boundary layer and the TPS environment, such as diffusive energy fluxes fromboundary layer gases. Lastly, spatial and temporal distributions and pyrolysis layer thickness evaluated interpolating ZURAM test data are compared with results froma finite element method simulation to investigate the effect of volume ablation.*****The complex and non-linear nature of ablation processes makes a systematic comparative analysis of ablators a challenging task. Within this thesis work, several approachesare adopted to investigate the ablative material performance and thermodynamics of the ablation process. Contemporary European ablators tested at IRS, together with already flown ablators, are analyzed and compared with respect to their performance. From this analysis, several considerations for an ablative thermal protection system performance optimization are formulated and discussed. Furthermore, a method for solving in-depth and surface energy equations and deriving a first approximation of the weight of each energy term is presented. A physical model which divides a charring ablator into different layers based on the thermochemical processes occurring withineach layer is adopted. Interpolating pyrometric and thermocouples measurements, spatial and temporal temperature distributions of lightweight ZURAM are evaluated.This ablator is developed by the German Aerospace Center in Stuttgart and tested under relevant re-entry conditions. From the resulting temperature profiles, partial derivatives terms of the in-depth energy equations are estimated for each layer and, consequently, the energy equations are solved. This method enables to evaluate energy terms which are generally difficult to assess due to the high complex natureof the boundary layer and the TPS environment, such as diffusive energy fluxes fromboundary layer gases. Lastly, spatial and temporal distributions and pyrolysis layer thickness evaluated interpolating ZURAM test data are compared with results froma finite element method simulation to investigate the effect of volume ablation.
Book Synopsis Analysis of Charring Ablation with Description of Associated Computing Program by : Fred W. Matting
Download or read book Analysis of Charring Ablation with Description of Associated Computing Program written by Fred W. Matting and published by . This book was released on 1970 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: A general method is presented for solving the problem of heat-shield response in the stagnation region of a charring type ablator. The analysis is actually for the stagnation point of an axisymmetric blunt body, but it is a valid approximate method for calculations in the stagnation region of any arbitrary blunt body. The analysis is applicable to windtunnel or flight conditions, and the heat loadings are either arbitrarily assigned or they are calculated concurrently with the heat-shield response. Surface heating (or cooling) mechanisms accounted for are those due to convection, radiation, homogeneous combustion, heterogeneous combustion, surface material removal by means other than combustion (includes erosion) , and sublimation. Physical and thermodynamic properties of the ablating material are arbitrarily assigned so that calculations can be made for various materials. A typical application of the analysis is given as an illustration. The analysis is machine programmed for numerical solutions usinga finite difference scheme, and a family of computing programs is used. These programs are described and instructions are provided for using them. The programs can be obtained from COSMIC, University of Georgia, Athens, Georgia, 30601.
Book Synopsis An Analysis of a Changing Ablation Thermal Protection System by : United States. National Aeronautics and Space Administration
Download or read book An Analysis of a Changing Ablation Thermal Protection System written by United States. National Aeronautics and Space Administration and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis One-dimensional Numerical Analysis of the Transient Response of Thermal Protection Systems by : Robert T. Swann
Download or read book One-dimensional Numerical Analysis of the Transient Response of Thermal Protection Systems written by Robert T. Swann and published by . This book was released on 1965 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differential equations governing the transient response of thermal protection systems to a hyperthermal environment are presented. These equations are expanded into finite-difference equations which are suitable for numerical solution. The equations provide for three layers of different materials, the first two of which may have moving boundaries. Concentrated heat sinks, such as metallic structures, may be located at the back surfaces of the second or third layers or of both layers. The analysis was developed primarily for charring ablators but is also applicable to impregnated ceramic, subliming, and heat-sink thermal protection systems. The principal difficulty encountered in numerical analysis of charring ablators is the extensive computer time required to obtain solutions. Provision is made in the numerical equations to introduce options which reduce computer time. The errors resulting from these options under various conditions are discussed. Good agreement is obtained between numerical results and exact solutions.
Book Synopsis Numerical Analysis of the Transient Response of Advanced Thermal Protection Systems for Atmospheric Entry by : Robert T. Swann
Download or read book Numerical Analysis of the Transient Response of Advanced Thermal Protection Systems for Atmospheric Entry written by Robert T. Swann and published by . This book was released on 1962 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations for the transfer of heat through thermal protection shields are derived in finite difference form. These equations are applicable to charring ablators, impregnated ceramics, subliming ablators, heat sinks, and insulating materials and have been programmed for solution on a high speed digital computer.
Book Synopsis Analytical Determination of the Effect of Thermal Property Variations on the Performance of a Charring Ablator by : Claud M. Pittman
Download or read book Analytical Determination of the Effect of Thermal Property Variations on the Performance of a Charring Ablator written by Claud M. Pittman and published by . This book was released on 1966 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Thermal Protection Materials by : S. D. Williams
Download or read book Thermal Protection Materials written by S. D. Williams and published by . This book was released on 1992 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Charring Ablation with Description of Associated Computing Program by : Fred W. Matting
Download or read book Analysis of Charring Ablation with Description of Associated Computing Program written by Fred W. Matting and published by . This book was released on 1970 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Entry Thermal Protection written by and published by . This book was released on 1968 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analysis of a Charring Ablator with Thermal Nonequilibrium, Chemical Kinetics, and Mass Transfer by : Ronald K. Clark
Download or read book An Analysis of a Charring Ablator with Thermal Nonequilibrium, Chemical Kinetics, and Mass Transfer written by Ronald K. Clark and published by . This book was released on 1973 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration Scientific and Technical Information Division Publisher : ISBN 13 : Total Pages :2300 pages Book Rating :4.F/5 ( download)
Book Synopsis NASA Scientific and Technical Reports by : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
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 1967 with total page 2300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Division Publisher : ISBN 13 : Total Pages :2084 pages Book Rating :4.E/5 ( download)
Book Synopsis A Selected Listing of NASA Scientific and Technical Reports for 1966 by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Download or read book A Selected Listing of NASA Scientific and Technical Reports for 1966 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1967 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1971 with total page 1330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
