Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers
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The Institution of Engineers, Malaysia
2011
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my.unimap-135802011-08-22T02:56:37Z Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers Mas Fawzi, Mohd Ali Azhar, Abdul Aziz fawzi@uthm.edu.my azhar@fkm.utm.my Computational Fluid Dynamics (CFD) Gasoline Direct Injection (GDI) Liquid sheet thickness Multiphase flow Pressure-swirl atomizers Sauter Mean Diameter (SMD) Spray angle Link to publisher's homepage at http://www.myiem.org.my/ Gasoline direct injection requires atomisers that are able to comply with stringent requirements in terms of spray structure and mean droplet size. Internal geometrical characteristics of an atomizer play an important role in producing the required spray quality. This paper investigates spray formation and outcome of a pressure-swirl type atomiser with several internal geometrical characteristic configurations using commercially available computational fluid dynamics codes. Both steady and unsteady flow of the spray formation from inside of the final orifice to a few millimeters downstream the nozzle with three different shapes of needle tips as well as two swirl intensities were investigated at fuel-air pressure differential from 3.0 to 10.0 MPa. The calculations took the advantages of fast and low computing cost by applying 2D-axisymmetric swirl solver together with multiphase Eulerian volume of fluid technique. The calculated data were validated by comparing measured static mass flow rate of an actual pressure-swirl atomizer at several fuel-air pressure differentials. Data from the calculations such as mass flow rate, spray cone angle, and liquid sheet thickness at nozzle exit were used to calculate the resultant droplet Sauter mean diameter using a known empirical correlation. Results from the calculations suggest that relatively high fuel-air pressure differential, lower discharge coefficient, stronger swirl intensity, thinner liquid film, and larger spray cone angle produce smaller droplet Sauter mean diameter. 2011-08-22T02:56:37Z 2011-08-22T02:56:37Z 2007-09 Article The Journal of the Institution of Engineers, Malaysia, vol. 68(3), 2007, pages 27-32 0126-513X http://myiem.org.my/content/iem_journal_2007-178.aspx http://hdl.handle.net/123456789/13580 en The Institution of Engineers, Malaysia |
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| language |
English |
| topic |
Computational Fluid Dynamics (CFD) Gasoline Direct Injection (GDI) Liquid sheet thickness Multiphase flow Pressure-swirl atomizers Sauter Mean Diameter (SMD) Spray angle |
| spellingShingle |
Computational Fluid Dynamics (CFD) Gasoline Direct Injection (GDI) Liquid sheet thickness Multiphase flow Pressure-swirl atomizers Sauter Mean Diameter (SMD) Spray angle Mas Fawzi, Mohd Ali Azhar, Abdul Aziz Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| description |
Link to publisher's homepage at http://www.myiem.org.my/ |
| author2 |
fawzi@uthm.edu.my |
| author_facet |
fawzi@uthm.edu.my Mas Fawzi, Mohd Ali Azhar, Abdul Aziz |
| format |
Article |
| author |
Mas Fawzi, Mohd Ali Azhar, Abdul Aziz |
| author_sort |
Mas Fawzi, Mohd Ali |
| title |
Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| title_short |
Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| title_full |
Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| title_fullStr |
Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| title_full_unstemmed |
Flow effect due to geometrical characteristics of pressure-swirl GDI atomizers |
| title_sort |
flow effect due to geometrical characteristics of pressure-swirl gdi atomizers |
| publisher |
The Institution of Engineers, Malaysia |
| publishDate |
2011 |
| url |
http://dspace.unimap.edu.my/xmlui/handle/123456789/13580 |
| _version_ |
1643790938114359296 |