A simple three component velocity measurement method using arotated split-film sensor

摘要

A rotated split-film anemometry method which can be used to obtainthree-component average flow velocities is reviewed and evaluated. Therelated theory, apparatus, calibration procedure, and results of the newtechnique are discussed. The new technique utilizes a single split-filmprobe in combination with a mechanical rotating probe, holder. The basicprocedure is to make a plane or two-component velocity measurement withthe probe in one orientation and then to rotate the probe 90° andmake 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 anaxisymmetric jet at various flow speeds and angles indicate that themethod has, under most circumstances, errors of about 5%. Slightlygreater errors were encountered at extreme test flow speeds and at largesensor yaw and pitch angles