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The calibration and application of five-hole probes

01 Jan 1978-pp 255-266
TL;DR: In this article, the results of programs to calibrate and employ five-hole probes of both angle-tube and prismatic geometries are presented, along with typical calibration data, and an accompanying discussion of the application or interpolation procedure.
Abstract: : In many complex flow fields such as those encountered in turbomachines, the experimental determination of the steady-state, three-dimensional characteristics of the flow field are frequently required. If space limitations or other considerations make nulling techniques impractical, five- hole probles in a non-nulling mode can be employed. However, this application requires complete three-dimensional calibration data which are not usually supplied by commercial vendors. Presented in this paper are the results of programs to calibrate and employ five-hole probes of both angle-tube and prismatic geometries. Included are descriptions of the calibration technique, typical calibration data, and an accompanying discussion of the application or interpolation procedure. Also documented are the variations in the calibration data due to Reynolds number and wall proximity effects. Typical measured data are included and, where applicable, these data are validated by comparison with data obtained using other types of velocity measuring instrumentation.
Citations
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Journal ArticleDOI
TL;DR: The mean streamwise development of pairs of longitudinal vortices embedded in an otherwise two-dimensional turbulent boundary layer was studied in this paper, where planes of closely spaced measurements of the three components of mean velocity were obtained at several streamwise locations and the vorticity and circulation were calculated.
Abstract: The mean streamwise development of pairs of longitudinal vortices embedded in an otherwise two-dimensional turbulent boundary layer was studied. Planes of closely spaced measurements of the three components of mean velocity were obtained at several streamwise locations, and the vorticity and circulation were calculated. Skin-friction measurements were also made. It was found that the rate of vorticity spreading in a vortex was greatly increased by close proximity of other vortices. The rate of streamwise circulation decrease was significantly greater for corotating vortices than for counter rotating vortices. Boundary-layer thinning and increased skin friction occured in regions where the secondary flow induced by the pairs was directed toward the wall; the boundary layer was thickened and skin friction reduced where the secondary flow was directed away from the wall.

218 citations

Journal ArticleDOI
TL;DR: In this paper, the calibration of a non-nulling, conical, seven-hole pressure probe over a large range of flow onset angles is described, and the calibration procedure is based on the use of differential pressures to determine the three components of velocity.
Abstract: This report describes the calibration of a non-nulling, conical, seven-hole pressure probe over a large range of flow onset angles. The calibration procedure is based on the use of differential pressures to determine the three components of velocity. The method allows determination of the flow angle and velocity magnitude to within an average error of 1.0° and 1.0% respectively. Greater accuracy can be achieved by using high quality pressure transducers. Also included is an examination of the factors which limit the use of the probe, a description of the measurement chain, an error analysis, and a typical experimental result. In addition, a new general analytical model of pressure probe behavior is described and the validity of the model is demonstrated by comparing it with experimentally measured calibration data for a three-hole yaw meter and a sevenhole probe.

91 citations

Journal ArticleDOI
TL;DR: In this paper, a method to extend this range by avoiding singularity is developed allowing calibration of a five-hole probe up to much larger angles of pitch and yaw, which can be successfully extended to angles of up to ±75°.

80 citations

Journal ArticleDOI
TL;DR: In this article, the effects of squealer rim height on three-dimensional flows and aerodynamic losses downstream of a high-turning turbine rotor blade have been investigated for a typical tip gap-to-chord ratio of h/c = 2.0%.

69 citations

Journal ArticleDOI
TL;DR: In this paper, a refined calibration technique for five-hole pressure probes operating in the non-nulling mode is presented, where the shape of the 3D surfaces are used to determine if a probe should not be used due to any machining abnormality or damage a probe has sustained.

65 citations