Theory and calibration of non-nulling seven-hole cone probes for usein complex flow measurement

Everett, K. N.; Durston, Donald A.; Gerner, A. A.

doi:10.2514/6.1982-232

Cited by 9 publications

(9 citation statements)

References 1 publication

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“…The error analysis of the present calibration procedure did not turn up errors of this magnitude; hence the least-squares polynomial approach (used by Everett et al, 1982) was probably the greatest source of error which could be significantly reduced.…”

Section: Error Analysismentioning

confidence: 99%

“…Development of the probe and calibration technique is described by Gallington (1980). Further refinements of the same basic technique are presented by Everett et al (1982Everett et al ( , 1983, and Gerner and Maurer (1982). Contained in this report is a thorough examination of seven-hole probe calibration theory and the factors which govern the use of seven-hole probes.…”

Section: Introductionmentioning

confidence: 99%

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Modelling, calibration, and error analysis of seven-hole pressure probes

Zilliac

1993

Experiments in Fluids

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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 l.O ~ 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.

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Section: Error Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling, calibration, and error analysis of seven-hole pressure probes

Zilliac

1993

Experiments in Fluids

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“…Highly sophisticated studies of multi-hole probe calibration techniques and high-angle flow measurement have been presented by Gerner et al (1984) and Everett et al (1982Everett et al ( , 1983, dealing with conical 7-hole probes characterized by small dimensions and the capability of flow angle measurements up to 70 ~ . These probes were used in a non-nulling mode for the determination of flow angle and velocity to within an error of 2.0 ~ and Mach number to within 0.04 with 95% certainty.…”

Section: Introductionmentioning

confidence: 99%

“…However, a 7-hole probe represents a certain amount of unavoidable additional efforts concerning fabrication, calibration and measuring setup in comparison to 5-and 4-hole probes. Ostowari and Wentz (1983) adapted the extended calibration technique presented by Everett et al (1982) to a conical 5-hole probe in order to permit a useful angle measurement range of _+ 85 ~ without the additional cost and effort of a 7-hole probe. Their modified technique is based on two different sets of calibration functions, defined for both, low flow angles and high flow angles, separately.…”

Section: Introductionmentioning

confidence: 99%

Advanced pneumatic method for gradient flow analysis

Glahn

Hallmann

Jeckel

et al. 1993

Experiments in Fluids

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Pneumatic 5-hole probes are widely known reliable sen-!~ ko/(rfis) sors for the analysis of three-dimensional flow fields. Since the v m2/s accuracy of such measurements depends strongly on the volume of p ky/m 3 the probe and the gradients in the flow, a miniature spherical ~b o five-hole-probe with an improved analysis method was developed. With the new method, the complete physically reasonable angle measurement range can be used now by introducing modified calibration functions. A dimensionless examination of the flow around Subscripts spheres shows the independence of the calibration functions within abs a wide range of flow velocities. Misrepresentations in flows with high meas gradients caused by the volume of the probe are estimated by ref a geometry based correction method. The quality of the method is st analysed by an extensive error calculation. Results of measurements s in a three-dimensional model combustor are discussed. dynamic viscosity kinematic viscosity = #/p density separation angle * depends on quantity absolute measured reference static surrounding List of symbols Ap m 2 a m/s c m/s C o --Dm dm Kp, iKo, K~ -km M m X * n p N/m 2 q N/m 2 R J/(koK ) Rer, O, z m S X *

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“…This approach allows for region-specific coefficient definitions and extends the angular range of the probe. Gerner and Maurer, 9 Gerner and Sisson, 10 and Everett et al 2,11 used seven-hole probes and split the angular domain into low-angle and high-angle flows (by methods similar to those used by Bryer and Pankhurst 1 ) and extended the usable angular range up to 70 deg in cone angle (angle between the velocity vector and the probe axis). Based on the work by Gerner and Maurer, 9 Ostowari and Wentz 12 extended the angular range of a conical five-hole probe to 85 deg.…”

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confidence: 98%

Calibration and Data-Reduction Algorithms for Nonconventional Multihole Pressure Probes

Ramakrishnan

Rediniotis

2005

AIAA Journal

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The development of calibration and data-reduction algorithms for nonconventional multihole pressure probes is presented. The algorithms that have been developed in the past for conventional five-and seven-hole probes are not optimal for probes with port arrangements (on the probe tip) that are nonconventional. Conventional algorithms utilize the axisymmetry of the port distribution pattern to define the nondimensional pressure coefficients. These coefficients are typically defined specifically for these patterns, but fail to represent correctly different patterns of port arrangements, such as patterns without axisymmetry or regularity. The algorithms introduced can handle any pattern of port arrangement, from axisymmetric and regular to random. Moreover, they eliminate the need to separate the measurement domain of a probe to low-angle and high-angle regimes, typical in conventional fiveand seven-hole-probe algorithms that require two different sets of pressure coefficient definitions and procedures. Additionally, the algorithms have been formulated such that they facilitate redundancy implementations, especially in applications where such redundancy is important, such as air-data systems. The developed algorithms are applied to a nonconventional probe, a nearly omnidirectional 18-hole probe, and demonstrate very high flow-measurement accuracy. Nomenclature= static pressure P t = total pressure q = freestream dynamic pressure R, S, T = polynomial coefficients for q est T s = static temperature T t = total temperature U = velocity magnitude at measurement point u = velocity magnitude at pressure port α = pitch angle β = yaw angle P1 = difference in port pressures, P 1 − P 3 P2 = difference in port pressures, P 2 − P 3 P3 = difference in port pressures, P 3 − P 4 = cone angle in global coordinate system θ = cone angle in local coordinate system θ 0 = polynomial coefficient for θ expression λ = scaling factor ρ = density of air = roll angle in global coordinate system φ = roll angle in local coordinate system φ 0 = polynomial coefficient for φ expression ψ = central angle between any two points on a sphere

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Theory and calibration of non-nulling seven-hole cone probes for usein complex flow measurement

Cited by 9 publications

References 1 publication

Modelling, calibration, and error analysis of seven-hole pressure probes

Modelling, calibration, and error analysis of seven-hole pressure probes

Advanced pneumatic method for gradient flow analysis

Calibration and Data-Reduction Algorithms for Nonconventional Multihole Pressure Probes

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