Re-orienting the Turbulent flow over an Inclined Cylinder of Finite Aspect ratio

TL;DR

This study experimentally investigates how tangential sweeping jets can generate yawing moments to control turbulent flow over an inclined cylinder, with potential applications in aerospace attitude control systems.

Contribution

It introduces a novel flow control method using tangential jets to produce yawing moments, offering an alternative to traditional control surfaces.

Findings

Large yawing moment coefficients can be achieved with tangential jets.

Flow interaction depends on actuator azimuthal location.

Surface visualization and PIV mapped flow interactions.

Abstract

Turbulent flow around a swept back circular cylinder was investigated experimentally using one or two small sweeping jets emanating tangentially to the surface and orthogonal to the axis of the cylinder creating a yawing moment that overcomes the natural restoring force to the plane of symmetry. It appears from the integral force balance data that large yawing moment coefficients can be generated in this manner, and the results could be used in the orientation and attitude control of a refueling boom thus avoiding the H-shape control surfaces that are currently used on Air Force tankers. The interaction between the jet and the flow in the lee of the cylinder was mapped using surface oil flow visualization and 2D-Particle Image velocimetry technique. The sensitivity of the interaction and its outcome to the change in the azimuthal location of the actuators was investigated.