Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.850
pages 814-824

ACTIVE DAMPING OF COMBUSTION INSTABILITIES WITH OSCILLATORY LIQUID FUEL SPRAYS

E. Lubarsky
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0150, U.S.A.
Y. Neumeier
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0150, U.S.A.
B. T. Zinn
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150, USA

RÉSUMÉ

This paper describes an experimental investigation that employed optical techniques to determine the characteristics of the combustion process in an actively controlled, liquid-fueled, unstable combustor when the ACS (Active Control System) was "on" and "off". The objective of the study was to determine the differences in the characteristics of the combustion process during stable and unstable operation, and the manner in which the ACS modified the combustion process to significantly reduce the amplitude of the instability. During active control, the ACS used a liquid fuel injector actuator to modulate the flow rate of the fuel into the combustor and an adaptive control approach to determine the optimal control signal phase. Initially, this study investigated the characteristics of the oscillations under different combustor operating conditions that produced stable and unstable operation without active control. This study showed that large amplitude instabilities occurred when the phase difference between the heat addition and pressure oscillations changed little along the combustion zone. In contrast, stable operation with very small amplitude pressure oscillations was attained when the above-mentioned phase gradually varied along the combustion region, thus dividing the combustion zone into regions that alternately damped and drove combustor oscillations. The effects of these driving/damping regions tended to counter one another, which resulted in significant damping of the unstable oscillations. Subsequent studies of the characteristics of the combustion process in an actively controlled combustor revealed that the ACS dramatically modified the characteristics of the combustion process. Specifically, it changed the nearly flat phase distribution observed under unstable operating conditions (in the absence of active control) to obtain a gradually varying phase distribution similar to that observed in stable combustors. The adaptive ACS apparently modulates the fuel injection rate with a phase delay that modifies the phase distribution to produce stable operating conditions


Articles with similar content:

CHARACTERISTICS OF FREE SPRAY DEVELOPMENT, MIXTURE FORMATION, AND COMBUSTION UNDER HIGH-PRESSURE SPLIT INJECTION
Atomization and Sprays, Vol.28, 2018, issue 3
Youichi Ogata, Keiya Nishida, Hirotaka Yamakawa, Kang Yang
ARTIFICIAL CONTROL OF SPRAY DYNAMICS APPLYING FUEL DESIGN APPROACH RELATED TO FLASH BOILING
Atomization and Sprays, Vol.27, 2017, issue 7
Eriko Matsumura, Jiro Senda
CONSTANT-VOLUME FOUR-LINED GAS-DISTRIBUTING COMBUSTION CHAMBER OF SPOOL-TYPE CONFIGURATION
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.18, 2014, issue 1-2
Omair Alhatim
ENERGETIC MATERIAL COMBUSTION STUDIES ON PROPELLANT FORMULATIONS AND ITS COMPONENTS
International Journal of Energetic Materials and Chemical Propulsion, Vol.5, 2002, issue 1-6
A. L. Ramaswamy
LES AND EXPERIMENTAL STUDY OF SELF-IGNITION OF SUPERSONIC HYDROGEN AND METHANE-HYDROGEN JETS IN A VITIATED CONFINED SUPERSONIC AIR STREAM
TSFP DIGITAL LIBRARY ONLINE, Vol.5, 2007, issue
Erwin George, Philippe Magre, Vladimir Sabel'nikov