View source for Dynamic Separation Control in a Low-Speed Asymmetric Diffuser with Varying Downstream Boundary Condition

{{HTDB paper
| authors = Samantha H. Feakins, Douglas G. MacMartin, Richard M. Murray
| title = Dynamic Separation Control in a Low-Speed Asymmetric Diffuser with Varying Downstream Boundary Condition
| source = 2003 AIAA Fluid Dynamics Conference
| year = 2003
| type =  
  Conference Paper
| funding = DARPA/Iconics
| url = http://www.cds.caltech.edu/~murray/preprints/fmm03-fluids.pdf
| abstract = 
This paper presents an experimental investigation
into the effect of a varying downstream boundary
condition on dynamic separation control in a twodimensional
low-speed asymmetric diffuser. The potential
for coupling between the downstream boundary
condition and the separation dynamics is relevant,
for example, in using separation control to enable
more aggressive serpentine aircraft inlets, where
the compressor may be close to the separation point.
Separation control in the experiment is obtained using
spanwise unsteady forcing from a single tangential
actuator located directly upstream of the separation
point. The downstream boundary condition
simulates the dominant quasi-steady and reflection
characteristics of a compressor. Although the
boundary condition affects the uncontrolled pressure
recovery, the optimal forcing frequency is shown to
depend only on the mass flow rate and not on either
the presence, impedance, or location of the downstream
boundary condition. At the conditions tested
herein, we therefore conclude that the mechanism
underlying dynamic separation control is local in nature,
and is not influenced by global system dynamics.
| flags = 
| tag = fmm03-fluids
| id = 2003j
}}