Full‐field IC engine flow measurement using particle image velocimetry

1996 ◽  
Vol 35 (2) ◽  
pp. 579 ◽  
Author(s):  
Mark Reeves
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Measurement ◽  
Particle Image ◽  
Ic Engine ◽  
Full Field ◽  
Image Velocimetry

Development of Particle Image Velocimetry for In-Flight Flow Measurement

2013 ◽  
pp. 269-289 ◽  
Author(s):  
Christina Politz ◽  
Nicholas J. Lawson ◽  
Robert Konrath ◽  
Janos Agocs ◽  
Andreas Schröder
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Measurement ◽  
Particle Image ◽  
Image Velocimetry

Experimental Investigation of Flow Blurring Atomizer at Near Field Using Particle Image Velocimetry

2019 ◽  
Author(s):  
Raju Murugan ◽  
Dhanalakshmi Sellan ◽  
Pankaj S. Kolhe
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Rate ◽  
Liquid Flow ◽  
Particle Image ◽  
Liquid Flow Rate ◽  
Diagnostic Technique ◽  
Reynolds Stresses ◽  
Full Field ◽  
Image Velocimetry ◽  
Spray Droplets

Abstract Two-fluid flow blurring atomization is characterized by the backflow recirculation of the air phase in the liquid pipe by bifurcation of the liquid and airflow. Most of the primary spray process is completed in the injector due to the penetration of air into the liquid tube. Thus, the majority of the liquid ligaments are converted into a fine spray at the outlet of the nozzle. Experiments were performed with two different air to liquid ratios (0.6 and 1) by mass, where water is considered as the liquid and airflow was kept constant (0.2 g/s). To change the ALR, the liquid flow rate was changed. Particle image velocimetry (PIV) diagnostic technique provides the full-field velocity of the spray droplets (discrete phase). It may be noted that sprays are self-seeded and PIV measurements reflect the droplet velocities instead of air velocity. To understand the effect of the spatial resolution of PIV on spray droplet velocity; experiments were conducted at three different spatial resolutions (11.8, 16.4 and 23.22 μm/pixel) for each ALR. As the ALR is increased, the mass of the liquid in the spray decreases, resulting in finer atomization and velocity of the spray droplets. This means that finer droplets are generated for the same mass of air at a lower liquid flow rate as compared to higher liquid flow rate. Note that Reynolds stresses provide an indication of the turbulent breakup of the droplet and larger magnitudes observed for higher ALR indicate finer atomization.

Post-processing deflectometry grid images using particle image velocimetry analysis

2021 ◽  
pp. 1-13
Author(s):  
Patrick O'Donoughue ◽  
Olivier Robin ◽  
Alain Berry ◽  
Alain Le Bot ◽  
Kevin Rouard
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Mechanical Vibration ◽  
Hybrid Approach ◽  
Phase Shifting ◽  
Integer Number ◽  
Analysis Tool ◽  
Full Field ◽  
Image Velocimetry ◽  
Phase Shifting Method

Abstract Deflectometry is a full-field optical technique for surface slope measurement based on recording the deformation of a grid image. A hybrid method is explored in which the grid images from a deflectometry measurement are processed using a particle image velocimetry analysis tool. The hybrid approach is compared to a common phase shifting algorithm for grid images based on a windowed discrete Fourier transform. The resulting slope maps compare well with those identified using the spatial phase shifting procedure. While the traditional phase shifting method has a tuning requirement that limits the optical setup to configurations that produce an integer number of pixels per grid period in the image, the use of particle image velocimetry analysis omits this calibration step. The applicability of an existing turnkey tool to perform full-field vibration imaging using deflectometry can benefit to research concerning mechanical vibration and related experimental methods.

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