Application of the Single-Axis-Rate-Table (SAT) of the DFVLR for the Evaluation of Stationary and Dynamic Gyro Properties

摘要

The wake behind a flat plate, held parallel to the free-stream, is simulated numerically using a finite difference Galerkin method for the solution of the time-dependent, incompressible Navier-Stokes equations. The temporal amplification process of perturbations at supercritical Reynolds numbers, leading finally to the saturation state, is studied. The Orr-Sommer-feld stability analysis of the quasi-steady state, occurring during the wake development, reveals that the flow can be divided into a locally absolutely unstable and a locally convectively unstable region. The influence of these stability properties on the wake, as well as their changes with Reynolds number and based bleed, is discussed based on the numerical simulation and the linear, local stability analysis.