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Closed-loop control of vortex formation in separated flows
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Joe, Won Tae Ahuja, Sunil Colonius, Tim MacMynowski, Doug Taira, Sam Rowley, Clancy |
| Copyright Year | 2010 |
| Description | In order to phase lock the flow at the desired shedding cycle, particularly at Phi,best, We designed a feedback compensator. (Even though the open-loop forcing at Wf below Wn can lead to phase-locked limit cycles with a high average lift,) This feedback controller resulted in the phase-locked limit cycles that the open-loop control could not achieve for alpha=30 and 40 Particularly for alpha=40, the feedback was able to stabilize the limit cycle that was not stable with any of the open-loop periodic forcing. This results in stable phase-locked limit cycles for a larger range of forcing frequencies than the open-loop control. Also, it was shown that the feedback achieved the high-lift unsteady flow states that open-loop control could not sustain even after the states have been achieved for a long period of time. |
| File Size | 10636897 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100018574 |
| Archival Resource Key | ark:/13960/t4gn3641p |
| Language | English |
| Publisher Date | 2010-02-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Controllers Cycles Phase Locked Systems Vortices Feedback Control Unsteady Flow Loops Separated Flow Compensators Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
