Thermoacoustic Combustion Instability Control


Book Description

Thermoacoustic Combustion Instability Control: Engineering Applications and Computer Codes provides a unique opportunity for researchers, students and engineers to access recent developments from technical, theoretical and engineering perspectives. The book is a compendium of the most recent advances in theoretical and computational modeling and the thermoacoustic instability phenomena associated with multi-dimensional computing methods and recent developments in signal-processing techniques. These include, but are not restricted to a real-time observer, proper orthogonal decomposition (POD), dynamic mode decomposition, Galerkin expansion, empirical mode decomposition, the Lattice Boltzmann method, and associated numerical and analytical approaches. The fundamental physics of thermoacoustic instability occurs in both macro- and micro-scale combustors. Practical methods for alleviating common problems are presented in the book with an analytical approach to arm readers with the tools they need to apply in their own industrial or research setting. Readers will benefit from practicing the worked examples and the training provided on computer coding for combustion technology to achieve useful results and simulations that advance their knowledge and research. Focuses on applications of theoretical and numerical modes with computer codes relevant to combustion technology Includes the most recent modeling and analytical developments motivated by empirical experimental observations in a highly visual way Provides self-contained chapters that include a comprehensive, introductory section that ensures any readers new to this topic are equipped with required technical terms




ARO and AFOSR Contractors Meeting in Chemical Propulsion, Held in Virginia Beach, Virginia on 3-6 June 1996


Book Description

Partial contents: Supercritical droplet behavior; Fundamentals of acoustic instabilities in liquid-propellant rockets; Modeling liquid jet atomization proceses; Liquid-propellant droplets dynamics and combustions in supercritical forced convective environments; Contributions of shear coaxial injectors to liquid rocket motor combustion instabilities; High pressure combustion studies under combustion driven oscillatory flow conditions; Droplet collision on liquid propellant combustion; Combustion and plumes; Development of a collisional radiative emission model for strongly nonequilibrium flows; Energy transfer processes in the production of excited states in reacting rocket flows; modeling nonequilibrium radiation in high altitude plumes; kinetics of plume radiation, and of HEDMs and metallic fuels combustion; Nonsteady combustion mechanisms of advanced solid propellants; Chemical mechanisms at the burning surface. p15




Flame Spray Drying


Book Description

Drying processes are among the most energy-consuming operations in industry. Flame spray drying (FSD) is a novel approach to reduce the energy supply needed for the spray drying process. Flame Spray Drying: Equipment, Mechanism, and Perspectives describes FSD technology and current developments in flame techniques and evaluates potential industrial implementation. Details advantages of FSD in terms of energy consumption and reduced drying time Promotes applications of biofuels for the drying process Analyzes the FSD method from CFD modelling to product quality Evaluates potential safety and product degradation risks Provides examples of potential applications of the FSD technique in drying of different materials This book describes an important new technique that is useful to chemical and process engineering researchers, professionals, and students working with drying technologies.







ASME Technical Papers


Book Description




Modeling and Active Control of Nonlinear Unsteady Motions in Combustion Chambers


Book Description

This program is devoted to understanding fundamental process in actual combustion chambers through coordination of theory, analysis and experiment. Theoretical work has been carried out in the framework of an approach based on a form of Galerkin's method. General unsteady motions are synthesized of modes. Spatial averaging produces a representation of the unsteady behavior in a combustion chamber as the time evolution of a system of coupled nonlinear oscillators, one for each mode. Consequently, immediate advantage can be taken of the methods available in contemporary research on nonlinear dynamical systems. The experimental work has involved ties with a Rijke tube with the Caltech dump combustor developed and used in work funded by AFOSR over the past 12 years. Those tests have demonstrated that due the presence of hysteresis in the stability of oscillations in the dump combustor, suppression of the oscillations is possible over a wide range of equivalence ratio by pulsed injection of secondary fuel in the recirculation zone. We have shown that the behavior is related to a subcritical bifurcation in the dynamics of the recirculation zone and unsteady combustion associated with vortex shedding.







Paper


Book Description