Measuring two-dimensional components of a flow velocity vector using a hot-wire probe

2007 ◽  
Vol 78 (8) ◽  
pp. 085109 ◽  
Author(s):  
Jan Kiełbasa
Keyword(s):  
Flow Velocity ◽  
Velocity Vector ◽  
Two Dimensional ◽  
Hot Wire ◽  
Wire Probe

Self-Aligning Hot-Wire Probe

1967 ◽  
Vol 71 (681) ◽  
pp. 657-658 ◽  
Author(s):  
A. D. Bond ◽  
A. M. Porter
Keyword(s):  
Constant Temperature ◽  
Two Dimensional ◽  
Servo Motor ◽  
Hot Wire ◽  
Turbulence Measurements ◽  
Wire Probe ◽  
Two Dimensional Flow ◽  
The Wire ◽  
Single Constant ◽  
Stream Direction

Summary:—This note describes how a single constant temperature hot wire may be used for measurements of direction, velocity and turbulence in a two-dimensional flow. The wire probe is rotated by a servo motor which automatically sets the wire with its axis either in the stream direction or normal to the flow. The accuracy of setting the wire in the direction of the stream is about , and across the stream is about 1°. If the higher accuracy is demanded the velocity and turbulence measurements require a second setting of the probe, at 90° to the previous one. When less precision is acceptable, the angle, velocity and turbulence measurements may be taken at the single setting, normal to the stream.

scholarly journals Characteristic Factors of a Compressor Rotor in Comparison With Two-Dimensional Cascade Data

1986 ◽  
Author(s):  
H. Pfeil ◽  
J. Sieber
Keyword(s):  
Rotor Blade ◽  
Axial Flow ◽  
Processing System ◽  
Two Dimensional ◽  
Hot Wire ◽  
Data Processing System ◽  
Wire Probe ◽  
Compressor Rotor ◽  
Profile Losses ◽  
Flow Compressor

The performance of a blade in an axial-flow compressor rotor is compared with the performance in a two-dimensional cascade. Using a stationary hot-wire probe and a data processing system the velocity profiles across the rotor wakes were measured in order to calculate the profile losses and the lift coefficients of the rotor blade.

Calibration of Triple-Wire Probes Using an Artificial Neural Network

2010 ◽  
Author(s):  
Noorallah Rostamy ◽  
Soheil Akbari ◽  
David Sumner ◽  
Donald J. Bergstrom
Keyword(s):  
Neural Network ◽  
Data Reduction ◽  
Velocity Vector ◽  
Reduction Method ◽  
Calibration Data ◽  
Hot Wire ◽  
Data Set ◽  
Wire Probe ◽  
The Mean ◽  
Data Reduction Method

Hot-wire anemometry is an established technique for velocity measurements in turbulent flows. Calibration of hot-wire probes is challenging due to the nonlinear relationship between the probe output voltage and the velocity, and the sensitivity to the temperature difference between the heated wire and the ambient flow. A triple-wire probe contains three mutually orthogonal wires that permit the three components of the local instantaneous velocity vector to be measured simultaneously. Calibration data reduction methods for multi-wire probes, based on variable-angle calibration techniques, may include curve-fits and direct-interpolation schemes. In the present study, a novel calibration data reduction method for a triple-wire probe is reported which uses an artificial neural network. Such a method has been successfully applied by other researchers for the calibration of seven-hole pressure probes. For the triple-wire probe, the neural network is used to produce a calibration relation between the three probe output voltages and the three components of the local velocity vector. Variable-angle calibration data were obtained for a triple-wire probe for velocity magnitudes from 5 to 40 m/s, yaw angles from −35° to +35°, and roll angles from 0° to 345°. A three-layer perceptron feed-forward network, using a Levenberg-Marquardt training algorithm, was applied to the calibration data, to map the mean voltages to the mean velocity components. The network was tested using an independent data set. The present results yielded standard errors of approximately ±0.38 m/s, ±0.25 m/s and ±0.26 m/s in the magnitudes of the streamwise, vertical, and cross-flow velocity components, respectively. The results showed that the present neural network model is not significantly sensitive to the size of the calibration data set, suggesting it may be a more convenient calibration data reduction method compared to other methods.

An Experimental Study of the Secondary Flow in a Curved Rectangular Channel

1980 ◽  
Vol 102 (1) ◽  
pp. 92-96 ◽  
Author(s):  
M. D. Kelleher ◽  
D. L. Flentie ◽  
R. J. McKee
Keyword(s):  
Secondary Flow ◽  
Rectangular Channel ◽  
Wave Number ◽  
Two Dimensional ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Dean Number ◽  
Wire Probe ◽  
Vortex Pattern ◽  
Secondary Motion

The Taylor-Gortler vortex pattern in a curved rectangular channel of high aspect ratio has been examined using hot wire anemometry. Using a two dimensional traversing mechanism, velocity surveys have been made at several radial locations across the channel for several values of Dean number. The velocity measurements show that the periodic secondary motion undergoes a phase shift as the hot wire probe crosses the midplane between the concave and convex walls. The measurements also indicate that the secondary flow wave number is constant over the range of Dean numbers examined. Complementary flow visualization photographs of the secondary motion have also been obtained.

Two Probes for the Measurement of the Complete Velocity Vector in Subsonic Flow

1968 ◽  
Vol 72 (696) ◽  
pp. 1066-1068 ◽  
Author(s):  
K. Dau ◽  
M. McLeod ◽  
D. Surry
Keyword(s):  
Velocity Vector ◽  
Static Pressure ◽  
Subsonic Flow ◽  
Hot Wire ◽  
Wire Probe ◽  
The University

Two probes which have been developed at the University of Toronto's Institute for Aerospace Studies for the purpose of determining the complete velocity vector in subsonic flow are described. That is, both probes provide the magnitude of the velocity at a point plus the two angles which determine the vector's orientation. The first probe, which also measures static pressure, was developed by K. Dau to determine wake properties behind a blowing wing. It uses a multiple pressure-hole technique. The second probe was originated by K. Dau and D. Surry and experimentally developed by M. McLeod. It is basically a spinning hot-wire probe whose periodic waveform uniquely defines the complete velocity vector.

Study of the Laminar Free-Convection Wake Above an Isothermal Vertical Plate

1973 ◽  
Vol 95 (3) ◽  
pp. 289-294 ◽  
Author(s):  
N. E. Hardwick ◽  
E. K. Levy
Keyword(s):  
Free Convection ◽  
Vertical Plate ◽  
Fluid Motion ◽  
Heated Plate ◽  
Two Dimensional ◽  
Wake Region ◽  
Hot Wire ◽  
Near Wake ◽  
Steady Laminar ◽  
Finite Difference Techniques

The steady, laminar, two-dimensional wake above a thin vertical isothermal heated plate cooled by free convection was investigated theoretically and experimentally. The system of partial differential equations governing the fluid motion and heat transfer in the vicinity of the plate and in the near wake region was formulated and solved using finite difference techniques. Using air, the temperature and velocity profiles in the wake region were measured experimentally using a laser holographic interferometer and a constant temperature hot wire anemometer.

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