Turbomachinery Flow Measurements Using Long-Nose Probes

Doukelis, A.; Mathioudakis, K.

doi:10.1115/gt2003-38488

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…A. Doukelis and K. Mathioudakis (2003) [1] presented a detailed account of a pneumatic measuring technique appropriate for flow field measurements in turbomachinery configurations, making use of long-nose 5-hole probes. Sources of error were also discussed, with particular attention on those that can be introduced by the nose geometry and the coordinate transformations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of pressure and species concentration measurement using uncertainty propagation

Stefopoulos¹,

Rigas²,

Tsirikoglou³

et al. 2022

E3S Web Conf.

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This paper presents a probabilistic uncertainity evaluation method as described in the Guide to the Expression of Uncertainty in Measurements (GUM) and its application to probe measurements on pressure and fuel concentration. All sources of unceratinties are expressed as probability distributions. Consequently, the overall standard uncertainty of the quantity can be calculated using the Gaussian error propagation formula. The result of the uncertainty evaluation yields the most probable value of the measurand and describes its distribution in terms of rectangular (standard uncertainty) or gaussian (“expanded” uncertainty) distribution. A pitot-static probe and a fuel-concentration stem probe are used in order to demonstrate the principle of the probabilistic uncertainty evaluation method. The uncertainty induced by the pressure and concentration data acquisition system as well as the calibration of the fuel-concentration probe are included in the analysis. The overall “expanded” uncertainties for the measured and calculated values are presented as a function of different inlet fuel flows. In addition to this, the individual sources of uncertainty to the overall standard uncertainty are presented and discussed. Moreover, the transformation of standard uncertainty to “expanded” uncertainty will provide the deviation of the measurement in a 95% or 99% normal distributed interval instead of a 67% rectangular distributed interval.

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Section: Introductionmentioning

confidence: 99%

Evaluation of pressure and species concentration measurement using uncertainty propagation

Stefopoulos¹,

Rigas²,

Tsirikoglou³

et al. 2022

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…Even though pressure probes with one [1] and seven or more holes are recently developed [2,3], five-hole probes are considered as the most useful means for research in such fields. They provide sufficient 3Dmeasurements combined with small dimensions, appropriate for complex geometries and facilities with area limitations [4].…”

Section: Introductionmentioning

confidence: 99%

“…Significant efforts have been devoted in devoloping pneumatic pressure probes since their introduction in the 1950s. Dominy and Hodson [5] studied the effects of Reynolds number, Mach number and turbulence intensity on the calibration of various sting probe geometries, for the Reynolds numbers in range between 7 x 10 3 and 8 x 10 4 . They found the existence of two distinct Reynolds number effects.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of geometry effects and performance of five-hole probe in measuring jets in crossflow

Magkoutas¹,

Efstathiadis²,

Kalfas³

2022

E3S Web Conf.

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Vortical and shear flows are common in turbomachinery. Multi-hole pressure probes are used in turbomachinery flows in order to provide robust and accurate measurements of both pressure and velocity components. In this study, two different miniature five-hole probes are designed and fabricated, both with a cobra shape. The probe tip was 1.45 mm and it was maintained in that size for the length of the cobra shape formation, providing very close proximity to the solid boundaries and reduced flow blockage. The difference among the probes corresponded to the head geometry, as the one probe was formed with a pyramid tip shape, while the other was maintained with a flat shape. The calibration process was carried out in an open-circuit suction wind tunnel for the range of ±32⁰ in yaw and pitch direction. The results showed that the pyramid probe exhibits a high flow angle spatial sensitivity and a reliable measurement range of ±28⁰ in yaw and pitch direction. The flat probe provided unexpected well angle sensitivity and reliable measurements data despite the fact that it is of a very simple form. The pyramid probe showed superior performance. In particular, the pyramid probe offers 12.5% wider operating range. In order to prove the effectiveness of the pyramid probe, measurements were obtained in a jet in cross flow. In order to evaluate the performance of the probe, further, a surface fit model was employed to produce ideal calibration coefficients. These were used to redefine the magnitude of the velocities in the measured flow domain. The accuracy in measurements was assessed, comparing the velocities produced by the two variants of pressure coefficients. The results indicate that the pyramid probe operates reliably in a very large range of constantly changing velocity vector, which occurs in jet in cross flow.

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Turbomachinery Flow Measurements Using Long-Nose Probes

Cited by 2 publications

References 10 publications

Evaluation of pressure and species concentration measurement using uncertainty propagation

Evaluation of pressure and species concentration measurement using uncertainty propagation

Experimental investigation of geometry effects and performance of five-hole probe in measuring jets in crossflow

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