A rotated split-film anemometry method which can be used to obtain three-component average flow velocities is reviewed and evaluated. The related theory, apparatus, calibration procedure, and results of the new technique are discussed. The new technique utilizes a single split-film probe in combination with a mechanical rotating probe, holder. The basic procedure is to make a plane or two-component velocity measurement with the probe in one orientation and then to rotate the probe 90 degrees and make another measurement. The two pairs of velocity and flow angle data, are correlated, for yawed flow effects, and resolved to identify three (steady-flow) speed and direction components. Measurements in an axisymmetric jet at various flow speeds and angles indicate that the method has, under most circumstances, errors of about 5%. Slightly greater errors were encountered at extreme test flow speeds and at large sensor yaw and pitch angles.
展开▼
