Scale Up Experiments On Liquid Fueled Active Combustion Control
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Control of Fluid Flow
Author | : Petros Koumoutsakos |
Publisher | : Springer Science & Business Media |
Total Pages | : 239 |
Release | : 2006-05-31 |
Genre | : Technology & Engineering |
ISBN | : 3540251405 |
This monograph presents the state of the art of theory and applications in fluid flow control, assembling contributions by leading experts in the field. The book covers a wide range of recent topics including vortex based control algorithms, incompressible turbulent boundary layers, aerodynamic flow control, control of mixing and reactive flow processes or nonlinear modeling and control of combustion dynamics.
An Experimental Study on Actively Controlled Dump Combustors
Author | : K. Yu |
Publisher | : |
Total Pages | : 18 |
Release | : 2001 |
Genre | : |
ISBN | : |
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.
Combustion Processes in Propulsion
Author | : Gabriel Roy |
Publisher | : Butterworth-Heinemann |
Total Pages | : 505 |
Release | : 2006 |
Genre | : Business & Economics |
ISBN | : 0123693942 |
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
Advances in Chemical Propulsion
Author | : Gabriel D. Roy |
Publisher | : CRC Press |
Total Pages | : 553 |
Release | : 2001-10-25 |
Genre | : Science |
ISBN | : 1420040685 |
Written by the scientists who performed the research, this book reports on the progress achieved by the outstanding team of researchers participating in the ONR Propulsion Program. It covers all aspects of the combustion process, from chemical synthesis, reaction pathways of the fuel, and combustor performance to the reduction of emissions, thrust vectoring, and control. The chapter authors discuss the relevant issues, describe their approach and results, and explain how the findings can be extended to practical applications. Richly illustrated and carefully edited for clarity, uniformity, and readability, this book offers a comprehensive survey of the field, from pre- to post-combustion.