Electrostatic Introduction Theory Based Spatial Filtering Method for Solid Particle Velocity Measurement

2007 ◽  
Author(s):  
Chuanlong Xu ◽  
Guanghua Tang ◽  
Bin Zhou ◽  
Daoye Yang ◽  
Jianyong Zhang ◽  
...  
Keyword(s):  
Solid Particle ◽  
Particle Velocity ◽  
Velocity Measurement ◽  
Spatial Filtering ◽  
Filtering Method ◽  
Particle Velocity Measurement

Velocity Measurement for Flow Particles by Using Spatial Filtering Technique Based on Sensor Array

2012 ◽  
Vol 508 ◽  
pp. 263-266 ◽  
Author(s):  
Zeng Xi Lu ◽  
Gang Yang ◽  
Zeng Shuang Wang
Keyword(s):  
Particle Velocity ◽  
Velocity Measurement ◽  
Sensor Array ◽  
Spatial Filtering ◽  
Spatial Filter ◽  
Capacitance Sensor ◽  
Filtering Method ◽  
Filtering Technique ◽  
Moving Particle ◽  
Particle Velocity Measurement

In comparison with cross correlative method based particle velocity measurement, the spatial filtering method for particle velocity measurement has the advantages of simplicity of the measurement system and convenience of data processing. In the paper a capacitive velocimeter, based on the spatial filtering method, is described. In this approach a capacitance sensor array has been used as a spatial filter for particle velocity measurements. Experiments were performed on a test rig and the experimental results show that the system relative error is within ±4% over a velocity range of 2-5m/s for a moving particle.

Particle velocity measurement in powder gas jets of coaxial powder nozzles for laser material deposition

2021 ◽  
Vol 33 (1) ◽  
pp. 012019
Author(s):  
Jonathan Schaible ◽  
Luis Andrea Hau ◽  
David Weber ◽  
Thomas Schopphoven ◽  
Constantin Häfner ◽  
...  
Keyword(s):  
Particle Velocity ◽  
Velocity Measurement ◽  
Laser Material ◽  
Gas Jets ◽  
Material Deposition ◽  
Particle Velocity Measurement

Velocity measurement for moving surfaces using spatial filtering method based on area image sensor

Optik ◽  
2014 ◽  
Vol 125 (24) ◽  
pp. 7136-7139 ◽  
Author(s):  
Xin He ◽  
Xiaoming Nie ◽  
Jian Zhou ◽  
Xingwu Long
Keyword(s):  
Velocity Measurement ◽  
Spatial Filtering ◽  
Image Sensor ◽  
Filtering Method

scholarly journals Particle Velocity Measurement In Swirl Flow, Laboratory Studies

1970 ◽  
Vol 8 (1) ◽  
pp. 1-14
Author(s):  
Hari Prasad Neopane ◽  
Bhola Thapa ◽  
Ole Gunnar Dahlhaug
Keyword(s):  
Particle Velocity ◽  
Velocity Measurement ◽  
Guide Vane ◽  
Critical Diameter ◽  
Swirl Flow ◽  
Operating Conditions ◽  
Francis Turbine ◽  
Laboratory Studies ◽  
Test Rig ◽  
Particle Velocity Measurement

This paper presents the laboratory studies of particle velocity measurement in highly swirl conditions similar to turbine flow in curved path. It includes a brief description of the developed test rig, concept of critical diameter of particle inside a Francis turbine and experimental analysis. When a particle is flowing in swirl flow, drag force and centrifugal force are two major forces influencing the particle equilibrium. The equilibrium of these two forces provides a critical diameter of the particle. While, a particle larger than the critical diameter move away from the centre and hit the wall, a particle smaller than the critical diameter flows along with the water, and ultimately sinks. For critical diameter, the particle continues to rotate in the turbine. Different shapes and sizes of particles were tested with the same operating conditions and found that triangularly shaped particles were more likely to hit the suction side of the guide vane cascade. Furthermore, this study supports the concept of separation of particles from streamlines inside the test rig, which led to the development of an operating strategy for a Francis turbine processing sediment-laden water. This study also permitted experimental verification of the size and the shape of a particle as it orbits in the turbine, until either the velocity components are changed or the particle became smaller.DOI: http://dx.doi.org/10.3126/kuset.v8i1.6034 KUSET 2012; 8(1): 1-14

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