Detail publikace

Některé aspekty rozpadu kapalinové stěny v tlakových vířivých sprejích

JEDELSKÝ, J. MALÝ, M. HOLUB, M. JÍCHA, M.

Originální název

SOME ASPECTS OF DISINTEGRATION OF ANNULAR LIQUID SHEET IN PRESSURE-SWIRL ATOMIZATION

Český název

Některé aspekty rozpadu kapalinové stěny v tlakových vířivých sprejích

Anglický název

SOME ASPECTS OF DISINTEGRATION OF ANNULAR LIQUID SHEET IN PRESSURE-SWIRL ATOMIZATION

Typ

článek ve sborníku

Jazyk

en

Originální abstrakt

In pressure-swirl (PS) atomization, the internal flow structure and the formation of a liquid film are closely linked to the quality of the resulting spray. The flow, as a subject to several disturbing sources, contain unsteadiness that can harm the atomization.In this paper, imaging is used to study discharge, near nozzle flow and primary breakup for small PS atomizer. The atomizer performance is characterised in terms of discharge coefficient, liquid sheet thickness, breakup distance, and nozzle efficiency. The breakup length according to near nozzle visualization and sheet breakup analysis wasfound much smaller than the length predicted using the inviscid model and both external and internal sources were identified as possible reasons. External flow instability sources were found by means of pressure fluctuation sensing upstream the nozzle. Phase-Doppler anemometry was used to document the mean structure of the developed spray and to characterise spray fluctuations. The findings are used to propose possible changes in the atomizer design for improvement of its performance.

Český abstrakt

Cílem této publikace je odhalit některé aspekty rozpadu kapalinové stěny v tlakových vířivých sprejích. Více info v anglickém abstraktu.

Anglický abstrakt

In pressure-swirl (PS) atomization, the internal flow structure and the formation of a liquid film are closely linked to the quality of the resulting spray. The flow, as a subject to several disturbing sources, contain unsteadiness that can harm the atomization.In this paper, imaging is used to study discharge, near nozzle flow and primary breakup for small PS atomizer. The atomizer performance is characterised in terms of discharge coefficient, liquid sheet thickness, breakup distance, and nozzle efficiency. The breakup length according to near nozzle visualization and sheet breakup analysis wasfound much smaller than the length predicted using the inviscid model and both external and internal sources were identified as possible reasons. External flow instability sources were found by means of pressure fluctuation sensing upstream the nozzle. Phase-Doppler anemometry was used to document the mean structure of the developed spray and to characterise spray fluctuations. The findings are used to propose possible changes in the atomizer design for improvement of its performance.

Klíčová slova

Nestability, kapalinová stěna, tlaková vířivá tryska, primární atomizace

Rok RIV

2015

Vydáno

01.09.2015

Místo

Budapest

ISBN

978-963-313-190-9

Kniha

Conference on Modelling Fluid Flow

Strany od

1

Strany do

8

Strany počet

8

BibTex


@inproceedings{BUT117106,
  author="Jan {Jedelský} and Milan {Malý} and Martin {Holub} and Miroslav {Jícha}",
  title="SOME ASPECTS OF DISINTEGRATION OF ANNULAR LIQUID SHEET IN PRESSURE-SWIRL ATOMIZATION",
  annote="In pressure-swirl (PS) atomization, the internal flow structure and the formation of a liquid film are closely linked to the quality of the resulting spray. The flow, as a subject to several disturbing sources, contain unsteadiness that can harm the atomization.In  this  paper,  imaging  is  used to study  discharge, near nozzle flow and primary breakup for small PS atomizer.    The    atomizer    performance    is characterised  in  terms  of  discharge  coefficient, liquid sheet thickness, breakup distance, and nozzle efficiency.  The  breakup  length  according  to  near nozzle visualization and sheet breakup analysis wasfound much smaller than the length predicted using the  inviscid  model  and  both  external  and  internal sources  were  identified  as   possible  reasons. External  flow  instability  sources  were  found  by means of pressure fluctuation sensing upstream the nozzle.  Phase-Doppler  anemometry  was  used  to document the mean structure of the developed spray and to characterise spray fluctuations. The findings are  used  to  propose  possible  changes  in  the atomizer   design   for   improvement   of   its performance.",
  booktitle="Conference on Modelling Fluid Flow",
  chapter="117106",
  howpublished="electronic, physical medium",
  year="2015",
  month="september",
  pages="1--8",
  type="conference paper"
}