Closed-loop active flow control of repetitive disturbances in a linear stator cascade

Steinberg, Simon J.; King, Rudibert

doi:10.2514/6.2018-3689

Cited by 2 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the experiments, blowing actuation out of rectangular slots was performed using steady blowing and a closed-looped controller. For the latter, an optimizationbased repetitive model predictive controller (RMPC) was implemented, which was first formulated by Lee et al [19][20][21] and successfully applied for the AFC of a linear stator cascade by Steinberg et al [22][23][24]. This approach combines the advantages of learning control, which can increase performance for periodic processes [25][26][27][28][29], with those of classical optimization-based model predictive control (MPC).…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, it aims to adapt the real-valued RMPC formulation presented in Refs. [22][23][24] for effective damping of periodic disturbances in a stator cascade to the present binary control task invoked by the usage of fast solenoid valves. On the other hand, it aims to implement this closed-loop control concept in a more complex and realistic test rig, using an annular compressor stator cascade, and finally investigate the resulting flow features.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Binary Repetitive Model Predictive Active Flow Control Applied to an Annular Compressor Stator Cascade With Periodic Disturbances

Fietzke

Mihalyovics

King

et al. 2021

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

Novel pressure gain combustion concepts invoke periodic flow disturbances in a gas turbine's last compressor stator row. This contribution presents studies of mitigation efforts on the effects of periodic disturbances on an annular compressor stator rig. The passages were equipped with pneumatic active flow control influencing the stator blade's suction side, and a rotating throttling disc downstream of the passages inducing periodic disturbances. For steady blowing, it is shown that with increasing actuation amplitudes $c_\mu$, a hub corner vortex's extension deteriorating the suction side flow can be reduced, resulting in an increased static pressure rise coefficient~$C_p$ of a passage. The effects of the induced periodic disturbances could not be addressed, by using steady blowing actuation. Considering a corrected total pressure loss coefficient $\zeta^*$, which includes the actuation effort, the stator row's efficiency decreases with higher $c_\mu$. Therefore, a closed-loop approach is presented to address the effects of the disturbances more specifically, thus lowering the actuation effort. For this, a Repetitive Model Predictive Control (RMPC) was applied, taking advantage of the disturbance's periodic nature. The presented RMPC formulation is restricted to a binary control domain to account for the used solenoid valves' switching character. An efficient implementation of the optimization within the RMPC is presented, which ensures real-time capability. As a result, $C_p$ increases in a similar magnitude but with a lower actuation mass flow of up to 66\,\%, resulting in a much lower~$\zeta^*$ for similar values of $c_\mu$.

show abstract