Pulsed Plasma Arrays for Tubulence Control
Abstract
The PI successfully achieved active control of flow separation using dielectric barrier discharge plasma actuation on a hemisphere mounted on an elevated flat surface in a wind tunnel. Visualization of streaklines in the flow around the hemisphere at Re = 40,000 for control-on vs. control-off showed a reduction in the size of the separation region with active flow control. Measurement of the surface pressure coefficient also showed a recovery in the pressure coefficient for control-on vs. control-off. Velocity measurement also showed that the mean-velocity profiles and turbulence profiles were modified so that there is a minimization of the separation region. The PI explored a variational theoretical formulation which enables computation of the difference between the exact solution of the Navier-Stokes equations and a computational solution with the DOLFIN method (Dynamic Object Oriented Library for Finite Element Computation). The PI demonstrated the use of this theoretical variational formulation on its ability to generate automatically and adaptively computational grids for flow around a curved surface and active flow control. The PI computationally investigated flow separation and active flow control around a curved surface using the adaptive variationally-optimized finite element method. The PI's computational results successfully showed a significant reduction in the flow separation region by active flow control.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 2012
- Accession Number
- ADA566770
Entities
People
- Haris J. Catrakis
Organizations
- University of California, Irvine