Computational Study of Separation Control Using ZNMF Devices: Flow Physics and Scaling Laws
Abstract
The primary objective of the proposed research was to gain a fundamental understanding of strategies, mechanisms, and scaling laws for successful control of separation using zern-net mass-flux (ZNMF) actuators. The key issue that was systematically studied was the optimal excitation frequencies in separated flows characterized by convective and/or global instabilities. The study was a complementary experimental/ numerical effort that capitalized on previous collaborations and was aimed at leveraging the respective strengths df CFD and experiments. The numerical component employed two different solvers will allowed us to investigate chord Reynolds numbers Re(c) up to O(10%). The complementary experiments use a large flat plate model equipped with a two-dimensional ZNMF actuator slot. Both the experiments and computations employed nonlinear spectral analysis to quantify quadratic coupling between the various instability mechanisms in separated flows. Outcomes included fundamental insights int0 the non-linear dynamics of separated airfoil flows and their implications for ZNMF separation control as well as development of improved lumped element design tool for ZNMF actuators in separation control applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 26, 2008
- Accession Number
- ADA478944
Entities
People
- Rajat Mittal
Organizations
- George Washington University