Download or read book Numerical Simulation of Transient Combustion Process in Pulse Detonation Engine written by Hyungwon Kim and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detonation Control for Propulsion written by Jiun-Ming Li and published by Springer. This book was released on 2017-12-05 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the latest developments in detonation engines for aerospace propulsion, with a focus on the rotating detonation engine (RDE). State-of-the-art research contributions are collected from international leading researchers devoted to the pursuit of controllable detonations for practical detonation propulsion. A system-level design of novel detonation engines, performance analysis, and advanced experimental and numerical methods are covered. In addition, the world’s first successful sled demonstration of a rocket rotating detonation engine system and innovations in the development of a kilohertz pulse detonation engine (PDE) system are reported. Readers will obtain, in a straightforward manner, an understanding of the RDE & PDE design, operation and testing approaches, and further specific integration schemes for diverse applications such as rockets for space propulsion and turbojet/ramjet engines for air-breathing propulsion. Detonation Control for Propulsion: Pulse Detonation and Rotating Detonation Engines provides, with its comprehensive coverage from fundamental detonation science to practical research engineering techniques, a wealth of information for scientists in the field of combustion and propulsion. The volume can also serve as a reference text for faculty and graduate students and interested in shock waves, combustion and propulsion.

Download or read book Numerical Simulation of Unsteady Normal Detonation Combustion written by Ajjay Omprakas and published by . This book was released on 2019 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to simulate normal detonation combustion which is a mode of operation for a Pulsed Detonation Engine (PDE). A supersonic flow with stoichiometric hydrogen-air mixture is made to impinge on a wedge, thus resulting in increasing the temperature and pressure across a shock wave leading to the formation of detonation wave. Different modes of the operations can be simulated by varying the incoming Mach number, pressure, temperature and equivalence ratio. For the case of normal detonation wave mode which is an unsteady process, after the detonation being initiated due to the shock induced by the wedge, the detonation wave propagates upstream in the flow as the combustion chamber Mach number is lower than the C-J Mach number. The concept of detonation wave moving upstream and downstream is controlled by changing the incoming flow field properties. By this method the unsteady normal detonation wave is made to oscillate in the combustion chamber leading to a continuous detonation combustion. The intention of this research is to simulate two cycles of detonation combustion in order to determine the frequency and to obtain the variation of flow properties at the exit plain with respect to time.

Download or read book Transient Analysis of a Pulsed Detonation Combustor Using the Numerical Propulsion System Simulation written by Anthony Scott Hasler and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a hybrid mixed flow turbofan (with detonation tubes installed in the bypass duct) is investigated in this study and compared with a baseline model of a mixed flow turbofan with a standard combustion chamber as a duct burner. Previous studies have shown that pulsed detonation combustors have the potential to be more efficient than standard combustors, but they also present new challenges that must be overcome before they can be utilized. The Numerical Propulsion System Simulation (NPSS) will be used to perform the analysis with a pulsed detonation combustor model based on a numerical simulation done by Endo, Fujiwara, et. al. Three different cases will be run using both models representing a take-off situation, a subsonic cruise and a supersonic cruise situation. Since this study investigates a transient analysis, the pulse detonation combustor is run in a rig setup first and then its pressure and temperature are averaged for the cycle to obtain quasi-steady results.

Download or read book Numerical Simulation of Pulse Detonation Engine Phenomena written by Xing He and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Pulse Detonation Phenomena in a Parallel Environment written by Prashaanth Ravindran and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this work was to develop a parallel algorithm that would be used in the simulation of the detonation process in the chamber of a pulse detonation engine. The emphasis is laid on reducing computation time while maintaining the accuracy of the solution and subsequently developing a numerical solution to be in agreement with real-world physical characteristics of a detonation wave initiation, build-up and progression. The flow is assumed to be unsteady, inviscid and non heat conducting. To adhere to real time effects, the flow equations are coupled with finite rate chemistry and the vibrational energy equation are based on a two-temperature model, to account for possible vibrational non-equilibrium. Finite Volume formulation is employed to ensure conservation and to allow proper handling of discontinuities. Runge-Kutta integration scheme has been utilized to obtain a time-accurate solution, with Roes flux difference splitting scheme applied to cell face fluxes. For higher-order spatial accuracy, MUSCL technique is employed. Equation stiffness has been taken care of by observing point implicit treatment of the source terms and detonation is initiated with the application of a localized hot-spot. The parallel algorithm has been developed using Message Passing Interface standard developed by the Argonne National Laboratory for the purposes of solving equations in a distributed environment. A proto-cluster of Beowulf type consisting of 8-nodes has been assembled and made operational, and an algorithm which performs space-time calculations simultaneously on the nodes has been successfully developed. A two-step global model for Hydrogen-Air mixture has been selected for validating the parallel algorithm with existing results, to establish veracity and accuracy while reducing computation time to almost a fourth. Excellent agreement has been found on comparison of the results with the same code when solved in a single processor.

Download or read book Natural Convection from Circular Cylinders written by Sandra K. S. Boetcher and published by Springer. This book was released on 2014-08-05 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a concise, yet thorough, reference for all heat transfer coefficient correlations and data for all types of cylinders: vertical, horizontal, and inclined. This book covers all natural convection heat transfer laws for vertical and inclined cylinders and is an excellent resource for engineers working in the area of heat transfer engineering.

Download or read book Numerical Simulation of Ignition and Transient Combustion in Fuel Vapor Clouds written by Jennifer Wiley and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Hypersonic Test Facilities written by Frank K. Lu and published by AIAA. This book was released on 2002 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Post detonation Combustion in a Closed Compartment written by Joseph F. Slomski and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Post detonation Combustion and Venting written by Joseph F. Slomski and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Active Flow and Combustion Control 2014 written by Rudibert King and published by Springer. This book was released on 2014-09-13 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reports on the latest theoretical and experimental advances in the field of active flow and combustion control. It covers new developments in actuator technology and sensing, in robust and optimal open- and closed-loop control, as well as in model reduction for control. It collects contributions presented during the third edition of the Active Flow and Combustion Control conference, held in September 10-12, 2014 at the Technische Universität Berlin (Germany). This conference, as well as the research presented in the book, have been supported by the collaborative research center SFB 1029 -Substantial efficiency increase in gas turbines through direct use of coupled unsteady combustion and flow dynamics, funded by the DFG (German Research Foundation).

Download or read book Numerical Simulations of Unsteady Flows in a Pulse Detonation Engine by the Conservation Element and Solution Element Method written by Hao He and published by . This book was released on 2006 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation is focused on a numerical framework for time-accurate solutions of high-speed unsteady flows with applications to flows of a Pulse Detonation Engine (PDE). The space-time Conservation Element and Solution Element (CESE) method employed is a novel numerical method for time-accurate solutions of nonlinear hyperbolic equations. As a part of the present result, a suite of two- and three-dimensional CESE codes has been developed. The computer codes are fully parallelized based on domain decomposition with Message Passing Interface (MPI) for data communication. The codes have been applied to analyze various flow fields of the PDE concept. First, numerical results of one-, two- and three-dimensional detonation waves are reported. The chemical reactions were modeled by a one-step, finite-rate, irreversible global reaction. The classical Zeldovich, von Neumann, and Doering (ZND) analytical solution was used to set up the initial conditions as well as for code validation. In the three-dimensional calculations, detonations in square, round, and annular tubes at different sizes were successfully simulated. Salient features of detonation waves were crisply resolved. Second, as a promising detonation initiation means, implosion with shock focusing was investigated. In two-dimensional calculations, we found a double-implosion mechanism in a successful detonation initiation process. Third, the plume dynamics of a PDE fueled by propane/air mixtures were studied to support the prototype development at NASA Glenn Research Center (GRC). Numerical results show that in each PDE cycle the engine is actively producing thrust forces only in about 6% of one cycle time period. The rest of the time is occupied by the blow-down and refueling processes. Since the PDE tube is always open, the processes depend on the flow conditions outside the PDE tube. In the near-field plume, complex shock/shock and shock/vortex interactions were found. In the far field, a spherical expansion wave is the dominant flow feature. This dissertation work is synergy of a very accurate and efficient CFD method, i.e., the CESE method, and the modern parallel computing technology. This approach could point to a new direction for high-fidelity simulations of complex flow fields of advanced propulsion systems.

Download or read book Modeling and Numerical Simulations of Pulse Detonation Engines with MHD Thrust Augmentation written by Timothy Branchek Roth and published by . This book was released on 2008 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of the Turbulent Combustion Process in a Rapid Compression Device written by U. Bielert and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Fuel Droplet Combustion Under Forced Convection written by Kun Lu and published by . This book was released on 2002 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Unsteady Combustion and Detonation Phenomena written by A. A. Boni and published by . This book was released on 1978 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: