Active Flow and Combustion Control 2014 by Rudibert King

By Rudibert King

The booklet reviews at the most recent theoretical and experimental advances within the box of lively move and combustion keep an eye on. It covers new advancements in actuator expertise and sensing, in powerful and optimum open- and closed-loop keep watch over, in addition to in version aid for keep watch over. It collects contributions provided throughout the 3rd variation of the lively circulation and Combustion regulate convention, held in September 10-12, 2014 on the Technische Universität Berlin (Germany). This convention, in addition to the study provided within the e-book, were supported by way of the collaborative examine heart SFB 1029 -Substantial potency raise in fuel generators via direct use of coupled unsteady combustion and movement dynamics, funded through the DFG (German learn Foundation).

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A closedloop flow controller adjusts the actuation amplitude, where the control command is calculated based on the control variable mentioned previously. Due to the working principle of PDE combustion chambers, the disturbance in the compressor flow will appear in a periodic manner with a frequency assumed to be known. Control algorithms such as Iterative Learning Control (ILC) [4] and Repetitive Control (RC) [29], [23] are especially suited to deal with such periodic processes. This paper analyses and compares both concepts when implemented as flow controllers for the linear compressor stator cascade.

Both signals were used within the Prediction Error Method (PEM) [22] to determine a dynamic plant model. Since the cascade represents a nonlinear system, it cannot be described well by a single linear model. J. Steinberg et al. 5 x/L Fig. 6. Top: First PC that describes the impact of the actuation on the cp -distribution of the suction surface of the middle blade for different maximum actuation amplitudes umax . 85. 8 1 Fig. 7. Top: First (left) and second (right) PC describing the impact of the running disturbance generator on the cp -distribution of the suction surface of the middle blade.

4. In all other cases illustrated, this figure oscillates around a mean value. This behavior indicates a change in incidence angle in relation to the phase angle. Taking the fc = 1 Hz case into account, the largest influence of the choking can be found in the lift coefficient behavior. For all choking frequencies considered a rising edge ranging from ϕ = 0◦ to ϕ = 100◦ can be observed. A relatively sharp falling edge is found between ϕ = 170◦ and ϕ = 240◦ . One phase can be subdivided into two cases.

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