Deviations in Spray Measurement Using Phase Doppler Anemometer, Laser Diffraction, and Image Analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00386723" target="_blank" >RIV/68407700:21220/25:00386723 - isvavai.cz</a>

Výsledek na webu

<a href="https://ilasseurope.org/events/ilass-europe-2025/" target="_blank" >https://ilasseurope.org/events/ilass-europe-2025/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Deviations in Spray Measurement Using Phase Doppler Anemometer, Laser Diffraction, and Image Analysis

Popis výsledku v původním jazyce

Optical methods are established as standard tools for droplet size measurement. This paper investigates deviations in spray measurement using three optical methods: phase Doppler anemometry (PDA), laser diffraction (LD), and image analysis (shadowgraphy). A MATLAB script with an in-house image processing procedure was developed to evaluate droplet sizes using image analysis. The accuracy of all three methods was previously tested on several calibration particle samples. This study focuses on measuring a pressure nozzle, emphasizing deviations in the evaluation of these methods. Each technique has specific advantages and limitations. PDA is a robust point measurement technique but is complex to set up. LD is a simple measurement method but can be affected by parasitic light. The image analysis method can evaluate non-spherical particles but is limited by image resolution and overall image quality. The paper presents the results of a spatial comparison of the droplet size distribution of all three methods. The measured droplet’s distribution is adjusted using an Abel transformation, and the PDA size distribution values are corrected for the droplet’s velocity through the measurement volume. This paper aims to identify sources of measurement discrepancies and provide insights into the accuracy and reliability of these methods.

Název v anglickém jazyce

Deviations in Spray Measurement Using Phase Doppler Anemometer, Laser Diffraction, and Image Analysis

Popis výsledku anglicky

Optical methods are established as standard tools for droplet size measurement. This paper investigates deviations in spray measurement using three optical methods: phase Doppler anemometry (PDA), laser diffraction (LD), and image analysis (shadowgraphy). A MATLAB script with an in-house image processing procedure was developed to evaluate droplet sizes using image analysis. The accuracy of all three methods was previously tested on several calibration particle samples. This study focuses on measuring a pressure nozzle, emphasizing deviations in the evaluation of these methods. Each technique has specific advantages and limitations. PDA is a robust point measurement technique but is complex to set up. LD is a simple measurement method but can be affected by parasitic light. The image analysis method can evaluate non-spherical particles but is limited by image resolution and overall image quality. The paper presents the results of a spatial comparison of the droplet size distribution of all three methods. The measured droplet’s distribution is adjusted using an Abel transformation, and the PDA size distribution values are corrected for the droplet’s velocity through the measurement volume. This paper aims to identify sources of measurement discrepancies and provide insights into the accuracy and reliability of these methods.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GA22-28869S" target="_blank" >GA22-28869S: Vznik kapek při rychlých expanzích: přechodné případy mezi unární, binární a hetorogenní cestou</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů