An automated vorticity surveying system using a rotating hot-wire probe
Abstract
A simple method is described whereby a standard X hot-wire probe is used to obtain both steady-flow streamwise vorticity and the mean-flow velocity components, flow angles, and turbulence data. The probe, with its measuring plane parallel to the probe axis, is rotated about this axis with a small eccentricity, so that the measuring plane is displaced slightly from the axis. Measurements are taken at 90-deg intervals to define the tangential velocity along the sides of a square in the plane perpendicular to the stream direction, from which vorticity is obtained directly. The rotating probe is combined with a two-axis traversing rig, and the entire system is controlled by a microprocessor. Results from flow surveys behind wing tips are shown to be in good agreement with measurements using a nonaligning five-hole yawmeter vorticity survey system. The advantages of the present method include the lower flow interference of the hot-wire probe and its faster response, which allows turbulence data to be obtained.
- Publication:
-
ICIASF 1989 - 13th International Congress on Instrumentation in Aerospace Simulation Facilities
- Pub Date:
- 1989
- Bibcode:
- 1989icia.cong..374B
- Keywords:
-
- Automatic Control;
- Flow Velocity;
- Hot-Wire Anemometers;
- Steady Flow;
- Vorticity;
- Wing Tips;
- Pressure Measurement;
- Wakes;
- Instrumentation and Photography