Calibration Procedures Developed for a Triaxial Hot-Film Probe and Preliminary Measurements of the Velocity Profile in the Wake of an Isolated Rotor.
Abstract
In an experiment which was conducted to determine the response of an isolated rotor to an inlet distortion, a triaxial hot-film probe was used to make velocity and flow angle measurements near the exit plane of the rotor. The velocity sensors were three mutually orthogonal film-type sensors operated in the constant temperature mode. This probe has been calibrated and procedures have been developed to extract velocity components from the anemometer output voltages. It has been determined that the proximity of the probe shaft results in severe distortion of the flow over the velocity sensors. The process which has been developed for computing velocities yields satisfactory results in test cases and is expected to be suitable for reducing the data from limited number of flow conditions for which the probe was used in the present experiment. however, it is considered to be too involved and too susceptible to error to be used in experiments where there is either a vast amount of data to be processed or there is no means of spot-checking the results. It is therefore considered mandatory that an improved probe geometry be devised which does not exhibit the degree of interference observed with the probe in question before undertaking to make extensive wake measurements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 15, 1978
- Accession Number
- ADA059515
Entities
People
- L. W. Hardin
- W. Hugh Hall
Organizations
- ARCO