Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Active Suppression Of Vortex Driven Combustion Instability Using Controlled Liquid Fuel Injection full books in PDF, epub, and Kindle. Read online Active Suppression Of Vortex Driven Combustion Instability Using Controlled Liquid Fuel Injection ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Bin Pang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (89 download)
Download or read book Active Suppression of Vortex-driven Combustion Instability Using Controlled Liquid-fuel Injection written by Bin Pang and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Suppression of Combustion Instability by Controlling Spray Properties in Liquid-Fueled Combustors written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes an experimental investigation of "slow" active control of combustion instabilities by changing the liquid fuel spray properties. Such control approach whose characteristic time is generally much longer than that of the period of the unstable oscillations needs "one time" variation of control inputs in response to changes in engine operating conditions. Using two types of fuel injectors that can produce large controllable variation of fuel spray properties, this study examined the dependence of acoustics-combustion process coupling, i.e., the driving of combustion instabilities upon liquid fuel spray droplet size, which affects the characteristic combustion time and, thus, the coupling between the acoustics and the combustion process. It was demonstrated that changing the spray characteristics significantly damps the instabilities. The results of this study strongly suggest that "slow" active control of the fuel spray droplet sizes with advanced injectors in real engines could be used to prevent the onset of detrimental combustion instabilities.
Author : J. P. Hathout
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (228 download)
Download or read book Modeling and Control of Combustion Instability Using Fuel Injection written by J. P. Hathout and published by . This book was released on 2001 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active control using periodic fuel injection has the potential of suppressing combustion instability without radically changing the engine design or sacrificing performance. In this paper. we carry out a study of optimal model-based control of combustion instability using fuel injection. The model developed is physically based and includes the acoustics. The heat-release dynamics their coupling and the injection dynamics. A heat-release model with fluctuations in the flame surface area as well as in the equivalence ratio is derived. We show that area fluctuations coupled with the velocity fluctuations drive longitudinal modes to resonance caused by phase-lag dynamics. while equivalence ratio fluctuations can destabilize both longitudinal and bulk modes caused by time-delay dynamics, similar to experimental observations. The dynamics of propositional and two-position (on-off) fuel injectors are included in the model. Using the overall model two different control designs are proposed. The first is an LQG/LTR controller where the time-delay effect is ignored and the second is a Posi-Cast controller which explicitly accounts for the delay. Injection at (i) the burning zone and (ii) further upstream is considered. The characteristics of fuel injectors including bandwidth, authority (pulsed-fuel flow rate). and whether it applies a proportional or a two-position (on-off) injection are discussed. We show that increasing authority and bandwidth result in improved performance. Injection at (ii) compared to (i) results in a trade-off between improved mixing and increased time-delay We also note that propositional injection is more successful than on-off injection since the former can modulate both amplitude and phase of the control fuel.
Author : Rudibert King
Publisher : Springer Science & Business Media
ISBN 13 : 3540714391
Total Pages : 441 pages
Book Rating : 4.5/5 (47 download)
Download or read book Active Flow Control written by Rudibert King and published by Springer Science & Business Media. This book was released on 2007-08-29 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains contributions presented at the Active Flow Control 2006 conference, held September 2006, at the Technische Universität Berlin, Germany. It contains a well balanced combination of theoretical and experimental state-of-the-art results of Active Flow Control. Coverage combines new developments in actuator technology, sensing, robust and optimal open- and closed-loop control and model reduction for control.
Author :
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (946 download)
Download or read book Active Combustion Instability Control During Scramjet Initiation Stage written by and published by . This book was released on 2001 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report was developed under SBIR contract for topic AF00-204. This SBIR Phase I project incorporated experimental and modeling efforts to develop an advanced active control strategy and a robust instrumentation/actuation system for the suppression of combustion instability inside a scramjet during the initiation stage. The work carried out includes 1) development of micro-opto-mechanical (MOM) pressure sensors for the detection of instantaneous chamber pressure in a harsh environment, 2) development of aerated-liquid actuators capable of enhancing spray atomization and controlling droplet evaporation rate, 3) characterization of scramjet combustion instability, and 4) simulations of time-accurate combustion dynamics. It has been shown that the MOM pressure sensor exhibits a nearly linear response over pressure, with good sensitivity and dynamic response. The aerated-liquid actuator can achieve the desired mixing and, thus, heat release rate for the injected liquid as the liquid jet is aerated with a selected amount of gas. The low-frequency acoustic signatures inside a liquid-fueled scramjet combustor were shown to be manageable. Results from time-accurate calculations have closely mimicked the experimental conditions and operating procedure. This approach to the detection and control of combustion dynamics was proven to be feasible and can be applied to scramjets, as well as other liquid fueled propulsion systems.
Author :
Publisher :
ISBN 13 :
Total Pages : 780 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 578 pages
Book Rating : 4.0/5 ( download)
Download or read book 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 2000-3650 - 2000-3699 written by and published by . This book was released on 2000 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anil Gulati
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (48 download)
Download or read book Feedback Control of Combustion Instabilities written by Anil Gulati and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christian O. Pascherelt
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (228 download)
Download or read book Performance Enhancement of Gas-Turbine Combustor by Active Control of Fuel Injection and Mixing Process - Theory and Practice written by Christian O. Pascherelt and published by . This book was released on 2001 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unstable thermoacoustic modes were investigated and controlled in an experimental low-emission swirl stabilized combustor, in which the acoustic boundary conditions were modified to obtain combustion instability. Axisymmetric and helical unstable modes wore identified for fully premixed combustion These unstable modes were associated with flow instabilities related to the recirculation region on the combustor axis and shear layer in- stabilities at the sudden expansion (dump plane). The combustion structure associated with the different unstable modes was visualized by phase locked images of OH chemi- luminescence, The axisymmetric mode showed large variation of the heat release during one cycle, while the helical modes showed circumferential variations in the location of maximal heat release. Two feedback control methods employed to suppress thermoa- coustic pressure oscillations and to reduce emissions reviewed: proportional acoustic control and fuel modulations. Microphone sensors monitored the combustion process and provided input to the control systems. An acoustic actuation modulated the airflow and thus affected the mixing process and the combustion. Suppression levels of up to 25 dB in the pressure oscillations and a concomitant 10% reduction of NO(x) emissions were obtained. At the optimal control conditions It was shown that the major effect of the control system was to reduce the coherence of the vortical structures which gave rise to the thermoacoustic instability. The specific design of the investigated experimental burner allowed testing the effect of different modulated fuel injection concepts on the combustion instability modes. Symmetric and antisymmetric fuel injection schemes were tested. Suppression levels of up to 12 dB in the pressure oscillations were observed. In some cases concomitant reductions of NO and CO emissions were obtained.
Author : C. E. Johnson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Suppression of Combustion Instabilities in a Liquid Fuel Combustor Using a Fast Adaptive Control Algorithm written by C. E. Johnson and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721527069
Total Pages : 30 pages
Book Rating : 4.5/5 (27 download)
Download or read book Adaptive Instability Suppression Controls in a Liquid-Fueled Combustor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An adaptive control algorithm has been developed for the suppression of combustion thermo-acoustic instabilities. This technique involves modulating the fuel flow in the combustor with a control phase that continuously slides within the stable phase region, in a back and forth motion. The control method is referred to as Adaptive Sliding Phasor Averaged Control (ASPAC). The control method is evaluated against a simplified simulation of the combustion instability. Plans are to validate the control approach against a more physics-based model and an actual experimental combustor rig. Kopasakis, George and DeLaat, John C. Glenn Research Center NASA/TM-2002-211805, NAS 1.15:211805, E-13500, AIAA Paper 2002-4075
Author :
Publisher :
ISBN 13 :
Total Pages : 614 pages
Book Rating : 4.0/5 ( download)
Download or read book 32nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit written by and published by . This book was released on 1996 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George Kopasakis
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)
Download or read book High Frequency Adaptive Instability Suppression Controls in a Liquid-Fueled Combustor written by George Kopasakis and published by . This book was released on 2003 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Suresh Menon
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book A Numerical Study of Secondary Fuel Injection Techniques for Active Control of Combustion Instability in a Ramjet written by Suresh Menon and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Poinsot
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (11 download)
Download or read book Suppression of Combustion Instabilities by Active Control written by T. Poinsot and published by . This book was released on 1987 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.-Y. Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Suppression of Combustion Instability by Controlling the Atomizing Properties in Liquid-fueled Combustors written by J.-Y. Lee and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Keith R. McManus
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Combustion Instability Suppression in Liquid-fueled Combustors written by Keith R. McManus and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
