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Gt power simulation thesis proposal

Gt power simulation thesis proposal module that determines the control

Simulation of Full-Scale Combustion Instabilities in Small-Scale Rigs using Positively Controlled Boundary Conditions

10:30 am, Tuesday, September 6
Montgomery Dark night Building, Room 317

The start of combustion instabilities (CIs) has hindered the expansion and gratifaction of combustion systems used in industrial, power generation and propulsion systems for a lot of decades. In order to solve this issue, many investigations up to now searched for to elucidate the feedback mechanism that drives these CI. Ideally, the experimental setup utilized in such studies should simulate the operating conditions (e.g. mean pressure and temperature, reactants as well as their supply system), geometry, and proportions of the unstable system to be able to correctly reproduce the combustion process and acoustic oscillations that exist in the unstable full-scale engine to make sure that the parameters affecting the feedback mechanism are reproduced within the laboratory rig. Clearly, investigating the instability within an unstable “full-scale” engine would satisfy these needs. However, investigating CI within the full-scale engine tests isn’t practical due to the exorbitant costs of these tests, and also the lack of ability to equip full-scale engines with diagnostic systems that may measure, e.g. the temporal and spatial dependence from the mean and acoustic pressures and velocities, temperature, compositions, and reaction rates. Due to these difficulties, most studies of CI up to now were performed in “small-scale” setups which were geometrically much like but smaller sized compared to full-scale engine combustor. While testing using these small-scale setups reduced the price of testing and created important results, the acoustic modes excited within the small-scale setups had significantly greater frequencies and may not simulate the low frequency oscillations which are excited within the unstable full-scale engines.

Gt power simulation thesis proposal Current efforts are focusing

The above mentioned discussion signifies that to be able to read the driving of CI entirely-scale engines in small-scale rigs, the second must simulate the acoustic environments, the combustion processes, and also the interactions between these processes within the unstable full-scale engine. This research continues to be investigating using a small-scale rig with real-time active boundary control (proven in above figure) to simulate the acoustic atmosphere from the full-scale engine within the small-scale rig. To achieve this goal, the active control system “generates” an acoustic impedance at location (II) from the small-scale rig that equals towards the acoustic impedance in the corresponding location within the full-scale unstable engine. If accomplished effectively, the acoustic oscillations in the area between locations (I) and (II) within the small-scale rig and also the full-scale engine could be identical. The developed active control system includes the next three modules: (1) a “wave separation” module that determines the left and right going waves within the small-scale rig from measured acoustic pressures (2) a “simulation” module that determines the options from the left and right going waves within the “missing part” from the full-scale engine (i.e. in the area right of locations (II) within the full-scale engine) and (3) an “actuator” module that determines the control signal for that actuator (e.g.

Gt power simulation thesis proposal assure that all

speaker) at location (II) that “generates” the appropriate acoustic impedance at location (II) from the small-scale rig.

Up to now, a wave separation formula was formulated while using approach to characteristics and effectively shown numerically and experimentally. A genuine time active control system for just one-dimensional acoustic oscillations was shown utilizing a tube outfitted with loudspeakers on its right and left hands sides. Within this setup, the left speaker generated acoustic oscillations that simulate the driving through the combustion process, and also the right speaker was positively controlled to simulate the acoustic field from the full-scale system. Up to now, this technique was utilized to show the excitation of travelling acoustic wave CI using the active control system to “generate” a non-reflecting boundary condition in the right boundary (II) from the tube. Current attempts are concentrating on the simulation of the standing acoustic wave CI inside a full-scale engine (i.e. the more tube within the figure above) within the small-scale rig.

Furthermore, one describing the acoustic and combustion processes within an annular combustor experiencing tangential CIs seemed to be designed to acquire abilities for performing real-time simulations from the “missing part” from the full-scale engine combustor experiencing such CI. The developed model was numerically solved to research the result of the existence of mean tangential flow component within the engine. The outcomes describe the fundamental driving/damping processes that control the investigated CIs. Additionally they reveal that the presence and direction from the mean tangential flow component critically modify the characteristics of tangential (spinning) instabilities. The use of this model in study regarding tangential CI in small-scale rigs is going to be studied later on.

Prof. Ben T. Zinn (consultant),

Prof. Jechiel Jagoda, and

Prof. Krishan K. Ahuja


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