Measurement of Wake Flow Fields, Including Reverse Flow, of Scale Vehicle Models Using a New 13-Hole Pitot Tube
Among the various methods for measuring flow velocity vectors, multi-holed pitot tubes offer the advantages of facilitating pressure measurements, low cost and ease of use. On the negative side, the range of measurable flow angles is limited (e.g., to ± 40° with 5-hole tubes) and pitot tubes require time-consuming calibration before use. The authors have developed a new pitot tube with a spherical head and 13 holes arranged such that the pitot head shows a 5-hole pattern when viewed from different right angles. This hole arrangement is equivalent to having several multi-holed pitot tubes connected to one pitot head and expands the measurable range of flow angles substantially to ± 135°. In addition, a robot is used to achieve fully automatic calibration. These two improvements overcome the traditional drawbacks of multi-holed pitot tubes.