Journal ArticleDOI
Modelling, calibration, and error analysis of seven-hole pressure probes
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TLDR
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.read more
Citations
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Numerical/experimental study of a wingtip vortex in the near field
TL;DR: In this article, the near field behavior of a wingtip vortex flow has been studied computationally and experimentally in an interactive fashion, using the method of artificial compressibility to solve the three-dimensional, incompressible, Navier-Stokes equations with experimentally determined boundary conditions and a modified Baldwin-Barth turbulence model.
Journal ArticleDOI
Experimental Study of Incompressible Jets with Different Initial Swirl Distributions: Mean Results
TL;DR: In this paper, the effect of low-to-moderate swirl (well below vortex breakdown) on jet growth rate, two tangential velocity profiles, a solid-body type and a q-vortex type with swirl numbers of both 0.10 and 0.23, have been investigated and compared with a nonswirling jet.
Journal ArticleDOI
Miniature Multihole Pressure Probes and Their Neural-Network-Based Calibration
TL;DR: In this paper, a backpropagation-based neural-network calibration algorithm was developed for multihole pressure probes, with flexibility in network architecture design and network self-optimization capabilities.
Initial Circulation and Peak Vorticity Behavior of Vortices Shed from Airfoil Vortex Generators
Bruce J. Wendt,Tom Biesiadny +1 more
TL;DR: In this article, an extensive parametric study of vortices shed from airfoil vortex generators has been conducted to determine the dependence of initial vortex circulation and peak vorticity on elements of the aerodynamic geometry and impinging flow conditions.
Journal ArticleDOI
Seven-Hole Pressure Probe Calibration Method Utilizing Look-Up Error Tables
TL;DR: In this paper, a two-step calibration and measurement procedure for seven-hole pressure probes has been developed that allows simple and accurate real-time processing, which adds an extra step to traditional least-squares calibration schemes such as Gallington's method.
References
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Journal ArticleDOI
Contributions to the Theory of Single-Sample Uncertainty Analysis
TL;DR: The concepts presented here were developed in connection with heat transfer and fluid mechanics research experiments of moderately large size and which may frequently require three experiments to be conducted.
Journal ArticleDOI
Algorithm 526: Bivariate Interpolation and Smooth Surface Fitting for Irregularly Distributed Data Points [E1]
TL;DR: A method of blvariate interpolation and smooth surface fitting is developed for z values given at points irregularly distributed in the x-y plane for Bivariate Interpolation and Smooth Surface Fitting for Irregularly Distributed Data Points.
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Principles of ideal-fluid aerodynamics
TL;DR: In this paper, the principles of ideal-fluid aerodynamics were proposed. And they were applied to aerodynamic principles in the field of aerodynamics, including the principle of ideal fluid dynamics.
ReportDOI
The calibration and application of five-hole probes
A. L. Treaster,A. M. Yocum +1 more
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.