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Numerical Study Of Detonation Flame Arrestor Performance And Detonation Interaction With The Arrestor Element
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Book Synopsis Numerical Study of Detonation Flame Arrestor Performance and Detonation Interaction with the Arrestor Element by : Hoden Ali Farah
Download or read book Numerical Study of Detonation Flame Arrestor Performance and Detonation Interaction with the Arrestor Element written by Hoden Ali Farah and published by . This book was released on 2020 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical study of detonation propagation and interaction with a flame arrestor product in a combustible gas/vapor transport pipeline system is conducted. The flame arrestor element is modeled as a porous medium using the Forchheimer equation, which is incorporated in the governing conservation equations as a momentum sink. The Forchheimer porous medium model is then used to model the flow through a representative four-inch detonation flame arrestor and is validated with experimental data. The detonation propagation simulation is modeled with the Reynolds averaged Navier-Stokes (RANS) equations extended for reacting flows. A 21-step chemical kinetic mechanism with 10 species is used to resolve the hydrogen-oxygen combustion. A series of detonation propagation case studies is conducted to validate the numerical model. The detonation propagation numerical result is qualitatively compared to experimental data and is shown to have the same trend. Numerical simulation is used to predict the transmission or interruption of detonation wave propagation through the flame arrestor product and is confirmed with historical test data.
Book Synopsis Deflagration and Detonation Flame Arresters by : Stanley S. Grossel
Download or read book Deflagration and Detonation Flame Arresters written by Stanley S. Grossel and published by John Wiley & Sons. This book was released on 2010-08-26 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed for chemical engineers and other technical personnel involved in the design, operation, and maintenance of facilities and equipment where deflagration and detonation flame arresters (DDFAs) may be required, this book fosters effective application and operation of DDFAs through treatment of their principles of operation, selection, installation, and maintenance methods. This reference covers a broad range of issues concerning DDAs, including: An overview of deflagration and detonation prevention and protection practices An overview of combustion and flame propagation and how DDAs halt propagation Deflagration and detonation flame arrester technology Installation in process systems Regulations, codes, and standards Illustrative examples, calculations, and guidelines for DDA selection Appendices, including a glossary, a flame arrester specification sheet for vendor quotation, and a listing of flame arrester manufacturers.
Book Synopsis Numerical Study of Detonation Wave Proagation in Combustion Wave Ignition (CWI) System by : Jeong-Yeol Choi
Download or read book Numerical Study of Detonation Wave Proagation in Combustion Wave Ignition (CWI) System written by Jeong-Yeol Choi and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis THEORETICAL AND NUMERICAL STUDY OF FLAME PROPAGATION AND TRANSITION TO DETONATION (DETONATION TRANSITION). by : CHONG OH LEE
Download or read book THEORETICAL AND NUMERICAL STUDY OF FLAME PROPAGATION AND TRANSITION TO DETONATION (DETONATION TRANSITION). written by CHONG OH LEE and published by . This book was released on 1991 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: accelerating flame.
Book Synopsis A Numerical Study of Oblique Detonation Wave Combustion by : Brent Steven Green
Download or read book A Numerical Study of Oblique Detonation Wave Combustion written by Brent Steven Green and published by . This book was released on 1995 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Коммунист: календарь-справоčник 1978 by :
Download or read book Коммунист: календарь-справоčник 1978 written by and published by . This book was released on 1977 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modelling of Detonation Initiation Via Shock Interaction with Multiple Flames by : Georgios Bakalis
Download or read book Numerical Modelling of Detonation Initiation Via Shock Interaction with Multiple Flames written by Georgios Bakalis and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Detonation in gaseous mixtures is a phenomenon of great importance for explosion safety assessment in hydrogen economy and for the development of advanced detonation-based propulsion systems. In practical applications, a detonation is generally caused by a deflagration to detonation transition (DDT) since a smaller amount of energy is required compared to a direct initiation. The key issue of DDT is finding the appropriate mechanisms to rapidly generate the detonation waves with a relatively weak ignition source. The objective of this work is to study numerically the possibility of DDT resulting from shock-multiple cylindrical flames interaction. The numerical setup aims to mimic an array of laminar flames ignited at different spark times, artificially inducing chemical activity to stimulate the coupling between the gasdynamics and the chemical energy release for the transition of deflagration-to-detonation. Using numerical simulations, a number of physical parameters are varied to determine their effect on the run-up distance as well as the time until the onset of detonation occurs, and to explore any scaling relationship among different them. The two-dimensional Navier-Stokes equations with one-step Arrhenius chemistry including the effects of viscosity, thermal conduction and molecular diffusion are used for the simulations. For comparison, simulations with Euler equations are also performed. The finite-volume operator splitting scheme used is based on the 2nd order Godunov-type, Weighted Average Flux (WAF) method with an approximate HLLC Riemann Solver. An Adaptive Mesh Refinement (AMR) technique is used to increase the resolution in areas of interest. The simulation results show that the interaction of the weak shock with the first cylindrical flame demonstrates very good agreement with the results in the literature and that a single weak shock-flame interaction was not enough to cause prompt DDT. However, a high degree of Richtmyer-Meshkov instabilities induced by repeated shock-flame interactions along with shock-boundary interactions generate turbulence that accelerates the flame brush, until eventually a hot spot ignition in the unreacted material develops into a multi-headed detonation wave. The simulation results also show that DDT is sensitive to the simulation method and that certain simulation parameters significantly affect the DDT phenomenon.
Book Synopsis Numerical study of detonation stabilization by finite length ramps by :
Download or read book Numerical study of detonation stabilization by finite length ramps written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nesta dissertação apresentam-se os resultados de um estudo numérico da interação entre uma onda de detonação oblíqua forte estabilizada pela rampa de um diedro e o leque expansão gerado pela deflexão da superfície do diedro. Neste estudo foi utilizado um código numérico que resolve asequações que governam o escoamento de uma mistura reativa de hidrogênio e ar. Estas equações são discretizadas por um procedimento do tipo volumes finitos centrado na célula de cálculo, segundo um esquema que leva em contaas velocidades características do escoamento. A presença de ondas de choque e detonação requer o uso de procedimentos de adaptação de malha. Neste trabalho procedimentos de enriquecimento e empobrecimento de malha são usados, o primeiro para melhorar a resolução das regiões do escoamento nas quais ocorrem grandes gradientes das propriedades, enquanto o segundo para retirar pontos da malha em locais onde os gradientes são pequenos. Mostra-se que este procedimento de empobrecimento, desenvolvido neste trabalho, resulta em ganhos no tempo de processamento. Na determinação dos parâmetros que levem a obter ondas do tipo Chapman-Jouguet como resultado da interação, inicialmente é realizada uma análisequase uni-dimensional baseada nos diagramas das polares de detonação e nos diagramas do tempo de indução da mistura reativa. Em seguida, os resultados das simulações numéricas mostram que a obtenção de uma detonação do tipo Chapman-Jouguet é possível para valores intermediáriosdo ângulo diedro, dentro da faixa das detonações estáveis. Quando o ângulo do diedro é próximo ao ângulo máximo permitido para detonações estáveis obteve-se o desacoplamento da onda de detonação, com a subsequente extinção do processo de combustão.
Book Synopsis Numerical Study of Chemically Reacting Viscous Flow Relevant to Pulsed Detonation Engines by : Tae-Hyeong Yi
Download or read book Numerical Study of Chemically Reacting Viscous Flow Relevant to Pulsed Detonation Engines written by Tae-Hyeong Yi and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational fluid dynamics code for two-dimensional, multi-species, laminar Navier-Stokes equations is developed to simulate a recently proposed engine concept for a pulsed detonation based propulsion system and to investigate the feasibility of the engine of the concept. The governing equations that include transport phenomena such as viscosity, thermal conduction and diffusion are coupled with chemical reactions. The gas is assumed to be thermally perfect and in chemically non-equilibrium. The stiffness due to coupling the fluid dynamics and the chemical kinetics is properly taken care of by using a time-operator splitting method and a variable coefficient ordinary differential equation solver. A second-order Roe scheme with a minmod limiter is explicitly used for space descretization, while a second-order, two-step Runge-Kutta method is used for time descretization. In space integration, a finite volume method and a cell-centered scheme are employed. The first-order derivatives in the equations of transport properties are discretized by a central differencing with Green's theorem. Detailed chemistry is involved in this study. Two chemical reaction mechanisms are extracted from GRI-Mech, which are forty elementary reactions with thirteen species for a hydrogen-air mixture and twenty-seven reactions with eight species for a hydrogen-oxygen mixture. The code is ported to a high-performance parallel machine with Message-Passing Interface. Code validation is performed with chemical kinetic modeling for a stoichiometric hydrogen-air mixture, an one-dimensional detonation tube, a two-dimensional, inviscid flow over a wedge and a viscous flow over a flat plate. Detonation is initiated using a numerically simulated arc-ignition or shock-induced ignition system. Various freestream conditions are utilized to study the propagation of the detonation in the proposed concept of the engine. Investigation of the detonation propagation is performed for a pulsed detonation rocket and a supersonic combustion chamber. For a pulsed detonation rocket case, the detonation tube is embedded in a mixing chamber where an initiator is added to the main detonation chamber. Propagating detonation waves in a supersonic combustion chamber is investigated for one- and two-dimensional cases. The detonation initiated by an arc and a shock wave is studied in the inviscid and viscous flow, respectively. Various features including a detonation-shock interaction, a detonation diffraction, a base flow and a vortex are observed.
Book Synopsis Numerical Simulation of Detonation Initiation by the Space-time Conservation Element and Solution Element Method by : Bao Wang
Download or read book Numerical Simulation of Detonation Initiation by the Space-time Conservation Element and Solution Element Method written by Bao Wang and published by . This book was released on 2010 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation is focused on the numerical simulation of the detonation initiation process. The space-time Conservation Element and Solution Element (CESE) method, a novel numerical method for time-accurate solutions of nonlinear hyperbolic equations, is extended to model conservation laws with stiff source terms for the detonation initiation process with multiple-step, finite-rate chemistry. The first part of the dissertation illustrates the numerical framework for unsteady chemically reacting flows by incorporating multiple-step, finite-rate chemical mechanisms using the CESE method. One- and two-dimensional solvers have been developed. Extensive code validation and verification are provided for the one- and two-dimensional CESE solvers. The second part focuses on the numerical investigation of the detonation initiation process. The numerical framework is first applied to the direct initiation of gaseous detonations by a blast wave. One-dimensional cylindrical and spherical direct initiation processes in a hydrogen-oxygen mixture are studied with a twenty-four step chemical reaction model. Structures of unsteady reaction zone are clearly resolved. The competition between heat release rate, front curvature, and unsteadiness is investigated. Detailed wave movements in the detonation wave front show that nonlinear waves play an important role in the reacceleration process and are the key to understanding the detonation failure mechanism. The detonation initiation process by implosion shock is then investigated. Shock focusing and shock interactions in the detonation initiation process are examined. Results show a two-shock implosion system due to the interaction between the reflected primary shock and the imploding contact discontinuity. Oblique detonation is studied for the code verification and validation of the two-dimensional CESE solvers. Stabilized detonation structures are resolved and the length of the induction zone is compared with point ignition test data. Implosion with polygonal shock fronts is then explored. Similar to the findings in the one-dimensional results, pressure histories in the focal region show multiple implosions. This Ph. D. study work applies the very accurate and efficient CESE method to study detonation initiation processes. The resultant solvers are state-of-the-art numerical codes that are ready to be applied to time-accurate solutions of detonation initiation processes. This approach provides a new numerical framework for high-fidelity simulations of detonation initiation.
Book Synopsis Numerical Study of Detonation in Solid Explosives Under Hydrodynamic and Elastic-plastic Confinement by : Eleftherios Ioannou
Download or read book Numerical Study of Detonation in Solid Explosives Under Hydrodynamic and Elastic-plastic Confinement written by Eleftherios Ioannou and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Two-Dimensional Numerical Study of Detonation Propagation Between Munitions by Means of Shock Initiation by : John Starkenberg
Download or read book A Two-Dimensional Numerical Study of Detonation Propagation Between Munitions by Means of Shock Initiation written by John Starkenberg and published by . This book was released on 1983 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computations of the flow field resulting when a munition is detonated adjacent to an identical neighbor have been made using the two-dimensional, eulerian, reactive hydrodynamic computer code, 2DE. The code was used to predict the effects of donor initiation site, interrround separation distance, and shielding. The results indicate that a very complicated flow field is produced; that far-side initiation of the donor represents a worst case; that, for rounds separated only by an air space, the shock initiation hazard is maximum at an intermediate interround separation; that even very thin plastic shields which fill the space between the rounds are remarkably effective in reducing the shock initiation hazard; and that when the explosive sensitivity is sufficiently reduced the acceptor is no longer initiated by buildup of the principal shock. The potential usefulness of 2DE in predicting shock initiation has been evaluated.
Book Synopsis Numerical Study of Upstream and Downstream Regions of One Dimensional Detonation Wave in a Dusty Gas Medium by : Shubhadeep Banik
Download or read book Numerical Study of Upstream and Downstream Regions of One Dimensional Detonation Wave in a Dusty Gas Medium written by Shubhadeep Banik and published by . This book was released on 2015 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In detonative combustion very high temperatures are attained by the burned gases. As a result, a large amount of thermal energy is produced during the combustion process. This heat can affect the state of the unburned fuel through radiation of heat from the burned gases. In this study a one-dimensional model was deemed appropriate to gain insight into the fundamental structure of the detonation wave. In this model, the detonation wave divides the fluid stream into an upstream region, consisting of fuel and oxidant, and a downstream region, consisting of burned gases. A set of computer programs, some developed during the present work and others developed by other investigators, were used in combination. These codes, when used in conjunction with an appropriate chemical reaction mechanism, can work for most gaseous fuel/oxidant mixtures. Ethane-air, methane-air, syngas-air and acetylene-oxygen mixtures, seeded with solid carbon particles, were used. Variation in flow properties were obtained for both the unburned and burned regions. The temperature levels observed in the burned region supports the previous statement regarding high thermal energy generation. The flame structure of the detonation wave region was studied. To study the effect of radiative heating in the unburned upstream region, appropriate emissivity and absorptivity models from literature were used. Carbon particles have a significant role in the upstream side, and as the results reveal, they have a relatively higher heat absorbing capacity than the gaseous components. A study of the amount of burned gas considered represented by the path length in evaluating the amount of heat radiated was also done to understand its effect on the upstream side."--Abstract, page iv.
Book Synopsis Direct Numerical Simulation of Detonation-Turbulence Interaction by : Monika Chauhan Rai
Download or read book Direct Numerical Simulation of Detonation-Turbulence Interaction written by Monika Chauhan Rai and published by . This book was released on 2013-09-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Study of Attached Oblique Detonation by : James A. Fort
Download or read book A Numerical Study of Attached Oblique Detonation written by James A. Fort and published by . This book was released on 1993 with total page 244 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 1987 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
