Detail publikace
Validace effervescentního modelu spreje se sekundárním rozpadem a jeho aplikace na model spalovací komory
BROUKAL, J. HÁJEK, J.
Český název
Validace effervescentního modelu spreje se sekundárním rozpadem a jeho aplikace na model spalovací komory
Anglický název
Validation of an effervescent spray model with secondary atomization and its application to modelling of a large-scale furnace
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
The present work consists of a validation attempt of an effervescent spray model with secondary atomization. The objective is the simulation of a 1 MW industrial-type liquid fuel burner equipped with effervescent spray nozzle. The adopted approach is based on a double experimental validation. Firstly, the evolution of radial drop size distributions of an isothermal spray is investigated. Secondly, the spray model is tested in a swirling combustion simulation by means of measured wall heat flux profile along the flame. In the first part of the paper, both experiments are described along with the measuring techniques. Drop sizes and velocities measured using a Dantec phase/Doppler particle analyser are analysed in detail for six radial positions. Local heat fluxes are measured by a reliable technique along the furnace walls in a large-scale water-cooled laboratory furnace. In the second part Euler-Lagrange approach is applied for two-phase flow spray simulations. The adopted spray model is based on the latest industrially relevant (i.e. computationally manageable) primary and secondary breakup sub-models complemented with droplet collision model and a dynamic droplet drag model. Results show discrepancies in the prediction of radial evolution of Sauter mean diameter and exaggerated bimodality in drop size distributions. A partial qualitative agreement is found in radial evolution of drop size distributions. Difficulties in predicting the formation of small drops are highlighted. Comparison of the predicted wall heat fluxes and measured heat loads in swirling flame combustion simulation shows that the absence of the smallest droplets causes a significant elongation of the flame.
Český abstrakt
Práce se zabývá pokusem o validaci modelu effervescentního spreje se sekundárním rozpadem. Cílem je simulace spalování extra-lehkého topného oleje v 1MW spalovací komoře. Použitý způsob validace se opírá o experimentální výsledky ze dvou typů měření. Nejprve se zkoumá velikostní rozložení kapek spreje v radiálním směru bez spalování. Poté se model aplikuje na simulaci ve vířivé spalovací komoře, kde se porovnávají tepelné toky do stěn.
Anglický abstrakt
The present work consists of a validation attempt of an effervescent spray model with secondary atomization. The objective is the simulation of a 1 MW industrial-type liquid fuel burner equipped with effervescent spray nozzle. The adopted approach is based on a double experimental validation. Firstly, the evolution of radial drop size distributions of an isothermal spray is investigated. Secondly, the spray model is tested in a swirling combustion simulation by means of measured wall heat flux profile along the flame. In the first part of the paper, both experiments are described along with the measuring techniques. Drop sizes and velocities measured using a Dantec phase/Doppler particle analyser are analysed in detail for six radial positions. Local heat fluxes are measured by a reliable technique along the furnace walls in a large-scale water-cooled laboratory furnace. In the second part Euler-Lagrange approach is applied for two-phase flow spray simulations. The adopted spray model is based on the latest industrially relevant (i.e. computationally manageable) primary and secondary breakup sub-models complemented with droplet collision model and a dynamic droplet drag model. Results show discrepancies in the prediction of radial evolution of Sauter mean diameter and exaggerated bimodality in drop size distributions. A partial qualitative agreement is found in radial evolution of drop size distributions. Difficulties in predicting the formation of small drops are highlighted. Comparison of the predicted wall heat fluxes and measured heat loads in swirling flame combustion simulation shows that the absence of the smallest droplets causes a significant elongation of the flame.
Klíčová slova anglicky
Drop size distribution, Effervescent atomization Modeling, Spray combustion
Rok RIV
2011
Vydáno
10.06.2011
ISSN
1359-4311
Časopis
Applied Thermal Engineering
Ročník
31
Číslo
13
Strany od–do
2153–2164
Počet stran
12
BIBTEX
@article{BUT49863,
author="Jakub {Broukal} and Jiří {Hájek},
title="Validation of an effervescent spray model with secondary atomization and its application to modelling of a large-scale furnace",
journal="Applied Thermal Engineering",
year="2011",
volume="31",
number="13",
month="June",
pages="2153--2164",
issn="1359-4311"
}