This thesis aims at reducing the impulse and the required mass flow needed in active separation control by pulsed actuation systems. The investigated strategy to achieve this is based on the cooperative action of multiple rows of actuators positioned downstream of each other. As shown by the analysis of PIV measurements in conjunction with pressure measurements, the fluidic rows can be actuated such that the flow tructures (vortices) they produce are strengthened and stabilized by subsequent actuator rows while they propagate downstream. This strategy was applied to the reattachment of pressure induced separation on a planar half diffuser with variable step angle. A maximum reduction of 67% in total actuation momentum could be achieved compared with a single row of actuators. The authority requirements on the single actuator can be reduced by 89% cµ , thus smaller and lighter actuation devices can be used to solve the flow control problem in future. A mass flow reduction up to 21% can be achieved by using a non-optimized cooperative actuation system. In future, a saving of approximately 30% is estimated if the system parameters, e.g. the duty cycle or a control algorithm regarding to the propagation velocities of the vortices, are fine tuned further. It is shown that this system is suitable to reattach the flow with less resources and therefore it is worth the additional effort.
Active separation control by multiple cooperative actuation
Aktive Ablösekontrolle mit multipler kooperierender Aktuatorik
2017
Sonstige
Elektronische Ressource
Englisch
DDC: | 629 |
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