Active Combustion Control in a Liquid-fueled Dump Combustor PDF Download
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Author: K. Yu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: K. Yu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: K. Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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A closed-loop liquid-fueld active control technique was applied in a dump combustor to enhance its combustion performance. Practical issues involving liquid fuel scaling effects and affordable control methods were studied experimentally. The results shed new light on the requirement of critical fuel flux effects of fuel droplet size on control and novel controller concepts that would help the future development work. The critical fuel flux was found to be dependent on the fuel droplet size and initial magnitude of the instabilities. When the fuel droplet size Do was reduced in the controlled injection the control efficiency for heat flux actuation increased significantly. The analysis yielded an exponential dependency on the droplet size. For a moderate droplet Reynolds number considered in this study the amplitude of controlled heat release for a given fuel amount was inversely proportional to the droplet size by a factor of Do( -1.4). Also two novel controller concepts which incorporated practical designs were tested and were shown to work effectively compared to the baseline case. One of the concepts was based on injecting fuel pulses at sub-harmonic frequencies of the instability thus addressing the limited actuator frequency response. The other concept utilized both open-loop and closed-loop control schemes to obtain enhanced performance including extension of the stable combustion zone. These results open up the possibility of applying the active combustion control technology to advanced propulsion devices.
Author: J. R. Hibshman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Indianapolis, Indiana, June 7-June 10, 1999.
Author: Jeffery M. Cohen
Publisher:
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Category :
Languages : en
Pages : 0
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Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Stockholm, Sweden, June 2 - June 5, 1998.
Author: Gabriel Roy
Publisher: Butterworth-Heinemann
ISBN: 0123693942
Category : Business & Economics
Languages : en
Pages : 505
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Book Description
Chemical propulsion comprises the science and technology of using chemical reactions of any kind to create thrust and thereby propel a vehicle or object to a desired acceleration and speed. Cumbustion Processes in Propulsion focuses on recent advances in the design of very highly efficient, low-pollution-emitting propulsion systems, as well as advances in testing, diagnostics and analysis. It offers unique coverage of Pulse Detonation Engines, which add tremendous power to jet thrust by combining high pressure with ignition of the air/fuel mixture. Readers will learn about the advances in the reduction of jet noise and toxic fuel emissions-something that is being heavily regulated by relevant government agencies. Lead editor is one of the world's foremost combustion researchers, with contributions from some of the world's leading researchers in combustion engineering Covers all major areas of chemical propulsion-from combustion measurement, analysis and simulation, to advanced control of combustion processes, to noise and emission control Includes important information on advanced technologies for reducing jet engine noise and hazardous fuel combustion emissions
Author: E. Gutmark
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: K. J. Wilson
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Category :
Languages : en
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Author: Sungbae Park
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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(Cont.) is a dump combustor, constructed at University of Maryland, so as to reproduce more realistic ramjet conditions. The third is an industrial swirl-stabilized combustor, constructed at University of Cambridge, to mimic realistic industrial gas combustor configurations which typically include large convective time delays, swirl, and on-line changes in the operating conditions. Results obtained from these three configurations show that through an understanding of the underlying physics and reduced-order modeling, one can design an appropriate actuation, sensing and control algorithm, all of which lead to model-based active control that reduces pressure oscillations to background noise.
Author: Ben T. Zinn
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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This report describes the results of experimental and theoretical investigations of the mechanisms by which the core flow combustion process in coaxial, single inlet, dump type ramjet engines drives longitudinal combustion instabilities. To this end, the behavior of V-shaped flames, similar to those often occurring in ramjet combustors, stabilized in longitudinal acoustic fields has been studied. The presence of burning vortical structures is observed in the flame region. These structures appear at frequencies close to the first natural acoustic frequency of the combustor and are believed to be connected with a shear layer type of instability of the flame. Experiments conducted show that the unsteady combustion in these structures is capable of driving the acoustics at the fundamental acoustic mode frequency. With increase in fuel air ratio, a spontaneous instability involving the fundamental mode is observed and explained in terms of increased driving associated with the higher, unsteady heat release rates. The results of experiments conducted with external acoustic excitation of the flame at different frequencies are also reported and confirm the idea that the vortical structures arise due to a fluid mechanical instability of the flame. It is shown that the interactions between the vortical structures and the system's acoustic field affect the heat release rates from the flame and provide a mechanism for the driving of longitudinal mode instabilities. Keywords: Coaxial dump type ramjet, Flame driving, Combustion, Acoustics longitudinal instability, Vortex shedding, Shear layer instability.
Author: O. Hsu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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