We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A Miniature Four-Hole Probe for Measurement of Three-Dimensional Flow with Large Gradients.
- Authors
Jangir, Ravirai; Sitaram, Nekkanti; Gajanan, Ct
- Abstract
A miniature four-hole probe with a sensing area of 1.284 mm² to minimise the measurement errors due to the large pressure and velocity gradients that occur in highly three-dimensional turbomachinery flows is designed, fabricated, calibrated, and validated. The probe has good spatial resolution in two directions, thus minimising spatial and flow gradient errors. The probe is calibrated in an open jet calibration tunnel at a velocity of 50m/s in yaw and pitch angles range of ±40 degrees with an interval of 5 degrees. The calibration coefficients are defined, determined, and presented. Sensitivity coefficients are also calculated and presented. A lookup table method is used to determine the four unknown quantities, namely, total and static pressures and flow angles. The maximum absolute errors in yaw and pitch angles are 2.4 and 1.3 deg., respectively. The maximum absolute errors in total, static, and dynamic pressures are 3.4, 3.9, and 4.9% of the dynamic pressures, respectively. Measurements made with this probe, a conventional five-hole probe and a miniature Pitot probe across a calibration section, demonstrated that the errors due to gradient and surface proximity for this probe are considerably reduced compared to the five-hole probe.
- Subjects
THREE-dimensional flow; STATIC pressure probes; TURBOMACHINES; PITOT tubes; MEASUREMENT errors; CALIBRATION
- Publication
International Journal of Rotating Machinery, 2014, p1
- ISSN
1023-621X
- Publication type
Article
- DOI
10.1155/2014/297861