scholarly journals Erratum: “Some Corrections to the Linearized Response of a Constant-Temperature Hot-Wire Anemometer Operated in a Low-Speed Flow” (Journal of Applied Mechanics, 1962, 29, pp. 554–558)

1962 ◽  
Vol 29 (4) ◽  
pp. 758-758
Author(s):  
W. G. Rose
Keyword(s):  
Constant Temperature ◽  
Applied Mechanics ◽  
Hot Wire ◽  
Low Speed ◽  
Speed Flow

Some Corrections to the Linearized Response of a Constant-Temperature Hot-Wire Anemometer Operated in a Low-Speed Flow

1962 ◽  
Vol 29 (3) ◽  
pp. 554-558 ◽  
Author(s):  
W. G. Rose
Keyword(s):  
Shear Stress ◽  
Constant Temperature ◽  
Flow Direction ◽  
Turbulent Intensity ◽  
Order Effects ◽  
Fluid Temperature ◽  
Hot Wire ◽  
Mean Velocity ◽  
Low Speed ◽  
Speed Flow

An equation is obtained for the instantaneous response of a constant-temperature hot-wire anemometer having a linearized output. The result includes the second-order effects of variations in fluid temperature and in flow direction. Corrected equations for outputs in terms of mean velocity, turbulent-intensity components, and shear stress are derived from the instantaneous response.

Hot-wire probes in low speed flow

1979 ◽  
Vol 18 ◽  
pp. 271-323 ◽  
Author(s):  
J.-D. Vagt
Keyword(s):  
Hot Wire ◽  
Low Speed ◽  
Speed Flow

Aerodynamics of Cooling Jets Introduced in the Secondary Flow of a Low-Speed Turbine Cascade

1990 ◽  
Vol 112 (3) ◽  
pp. 539-546 ◽  
Author(s):  
F. Bario ◽  
F. Leboeuf ◽  
A. Onvani ◽  
A. Seddini
Keyword(s):  
Secondary Flow ◽  
Side Wall ◽  
Velocity Fields ◽  
Measuring Apparatus ◽  
Flow Ratio ◽  
Turbine Cascade ◽  
Hot Wire ◽  
Local Pressure ◽  
Low Speed ◽  
Jet Behavior

The aerodynamic behavior of cold discrete jets in a cold secondary flow is investigated. Configurations including single jets and rows of jets are studied. These jets are introduced through the side wall of a low-speed nozzle turbine cascade. The experimental setup and the jet behavior are fully described. The effects of location with respect to the blades, mass flow ratio, yaw, and incidence angles on the aerodynamics of single jets are investigated. The influence of neighboring jets is detailed in the case of multiple jet configurations. The interaction with the secondary flow is presented. The local pressure and velocity fields, trajectories, and visualizations are discussed. The measuring apparatus includes a five-hole probe and a hot wire for intermittency measurements.

Turbulent Surface Pressure Field in Low Speed Flow

2014 ◽  
pp. 91-100
Author(s):  
Stéphane Caro ◽  
Vincent Cotoni ◽  
Phil Shorter ◽  
Fred Mendonça
Keyword(s):  
Surface Pressure ◽  
Pressure Field ◽  
Low Speed ◽  
Speed Flow

A Three-Dimensional Analysis of Rotor Wakes

1972 ◽  
Vol 23 (4) ◽  
pp. 285-300 ◽  
Author(s):  
C E Whitfield ◽  
J C Kelly ◽  
B Barry
Keyword(s):  
Dimensional Analysis ◽  
Constant Temperature ◽  
Three Dimensional ◽  
Axial Flow ◽  
Visual Presentation ◽  
Hot Wire ◽  
Three Dimensional Flow ◽  
Dimensional Flow

SummaryMany investigators have studied the aerodynamics of axial flow turbomachinery but none has produced a complete map of the three-dimensional flow behind a rotor row. This is of considerable interest to the aero-acoustician. A system is described which uses a constant temperature hot-wire anemometer to analyse the flow behind such a rotor. Although much information may be extracted by using the technique, its interpretation depends to a large extent on its form of presentation. An analysis of the flow behind a research fan is used as a means of discussing various forms of visual presentation.

scholarly journals Simplified Calibration Method for Constant-Temperature Hot-Wire Anemometry

2020 ◽  
Vol 10 (24) ◽  
pp. 9058
Author(s):  
Hidemi Takahashi ◽  
Mitsuru Kurita ◽  
Hidetoshi Iijima ◽  
Seigo Koga
Keyword(s):  
Boundary Layer ◽  
Flow Velocity ◽  
Constant Temperature ◽  
Calibration Method ◽  
Large Temperature ◽  
Velocity Data ◽  
Hot Wire ◽  
Temperature Variations ◽  
Wire Temperature ◽  
Hot Wire Anemometry

This study proposes a unique approach to convert a voltage signal obtained from a hot-wire anemometry to flow velocity data by making a slight modification to existing temperature-correction methods. The approach was a simplified calibration method for the constant-temperature mode of hot-wire anemometry without knowing exact wire temperature. The necessary data are the freestream temperature and a set of known velocity data which gives reference velocities in addition to the hot-wire signal. The proposed method was applied to various boundary layer velocity profiles with large temperature variations while the wire temperature was unknown. The target flow velocity was ranged between 20 and 80 m/s. By using a best-fit approach between the velocities in the boundary layer obtained by hot-wire anemometry and by the pitot-tube measurement, which provides reference data, the unknown wire temperature was sought. Results showed that the proposed simplified calibration approach was applicable to a velocity range between 20 and 80 m/s and with temperature variations up to 15 °C with an uncertainty level of 2.6% at most for the current datasets.

scholarly journals Software Sensor for Airflow Modulation and Noise Detection by Cyclostationary Tools

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2414
Author(s):  
Mohamad Alkoussa Dit Albacha ◽  
Laurent Rambault ◽  
Anas Sakout ◽  
Kamel Abed Meraim ◽  
Erik Etien ◽  
...  
Keyword(s):  
Flow Rate ◽  
Physical Phenomenon ◽  
Experimental Setup ◽  
Noise Detection ◽  
Air Flow Rate ◽  
Audio Signals ◽  
Software Sensor ◽  
Low Speed ◽  
Speed Flow ◽  
Noise Disturbances

The paper presents tools to model low speed airflow coming from a turbulent machine. This low speed flow have instabilities who generate noise disturbances in the environment. The aim of the study proposed in this paper, is the using of cyclostationary tools with audio signals to model this airflow and detect the noisy frequencies to eliminate this noise. This paper also deals with the extraction in real time of the frequency corresponding to the noise nuisance. This extraction makes it possible to build a software sensor. This software sensor can be used to estimate the air flow rate and also to control a future actuator which will reduce the intensity of the noise nuisance. This paper focuses on the characteristic of the sound signal (property of cyclostationarity) and on the development of a software sensor. The results are established using an experimental setup representative of the physical phenomenon to be characterised.

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