Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV
The present article offers a detailed analysis of helium jet velocity and vorticity intensity distribution using the particle image velocimetry (PIV) technique. A gaseous fuel injector featuring an interchangeable tip was implemented. The test campaign involved the use of three nozzle patterns chara...
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2025-05-01
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| author | Giovanni Cecere Mats Andersson Simona Silvia Merola Adrian Irimescu Bianca Maria Vaglieco |
| author_facet | Giovanni Cecere Mats Andersson Simona Silvia Merola Adrian Irimescu Bianca Maria Vaglieco |
| author_sort | Giovanni Cecere |
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| description | The present article offers a detailed analysis of helium jet velocity and vorticity intensity distribution using the particle image velocimetry (PIV) technique. A gaseous fuel injector featuring an interchangeable tip was implemented. The test campaign involved the use of three nozzle patterns characterized by different orifices shape and orientations. The helium was injected into a constant volume chamber (CVC) and the delivery pressure varied, as well as that inside the chamber, in order to obtain pressure ratios (PRs) ranging from 2 to 20. The synchronization system was set to record two consecutive frames at different time-instants after the start of energizing (aSOE). Green light from a dual cavity Nd:YAG laser was used for illumination and a 4-megapixel PIV-camera for image capture. Vegetable oil particles were seeded into the chamber to trace the helium jet structure and cross-correlation methodology employed to measure their instantaneous displacements. The role of orifices size and orientations has been deeply scrutinized and related to the morphological outcomes. The least-oriented nozzle (first) exhibited the highest values of jet penetration and well-defined vortex structures. In contrast, the more the orifices are oriented, the wider the regions interacting with surrounding environment. Specifically, geometry with smaller orifice sizes (third) returned an overall absence of localized significant vortex structures. This deficiency is counterbalanced by a large distribution of small vortices that were observed to replace the main rings for each condition examined. |
| format | Article |
| id | doaj-art-148fe84bf22649b69d8df6cf3170ec44 |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-05-01 |
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| spelling | doaj-art-148fe84bf22649b69d8df6cf3170ec442025-08-20T03:11:18ZengMDPI AGApplied Sciences2076-34172025-05-011511618010.3390/app15116180Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIVGiovanni Cecere0Mats Andersson1Simona Silvia Merola2Adrian Irimescu3Bianca Maria Vaglieco4CNR–STEMS Science and Technology Institute for Sustainable Energy and Mobility, 80125 Napoli, ItalyDepartment of Mechanics and Maritime Sciences, Chalmers University of Technology, Chalmersplatsen 4, 412 96 Göteborg, SwedenCNR–STEMS Science and Technology Institute for Sustainable Energy and Mobility, 80125 Napoli, ItalyCNR–STEMS Science and Technology Institute for Sustainable Energy and Mobility, 80125 Napoli, ItalyCNR–STEMS Science and Technology Institute for Sustainable Energy and Mobility, 80125 Napoli, ItalyThe present article offers a detailed analysis of helium jet velocity and vorticity intensity distribution using the particle image velocimetry (PIV) technique. A gaseous fuel injector featuring an interchangeable tip was implemented. The test campaign involved the use of three nozzle patterns characterized by different orifices shape and orientations. The helium was injected into a constant volume chamber (CVC) and the delivery pressure varied, as well as that inside the chamber, in order to obtain pressure ratios (PRs) ranging from 2 to 20. The synchronization system was set to record two consecutive frames at different time-instants after the start of energizing (aSOE). Green light from a dual cavity Nd:YAG laser was used for illumination and a 4-megapixel PIV-camera for image capture. Vegetable oil particles were seeded into the chamber to trace the helium jet structure and cross-correlation methodology employed to measure their instantaneous displacements. The role of orifices size and orientations has been deeply scrutinized and related to the morphological outcomes. The least-oriented nozzle (first) exhibited the highest values of jet penetration and well-defined vortex structures. In contrast, the more the orifices are oriented, the wider the regions interacting with surrounding environment. Specifically, geometry with smaller orifice sizes (third) returned an overall absence of localized significant vortex structures. This deficiency is counterbalanced by a large distribution of small vortices that were observed to replace the main rings for each condition examined.https://www.mdpi.com/2076-3417/15/11/6180H2 substituteheliummixing propertiesPIVoptical investigation |
| spellingShingle | Giovanni Cecere Mats Andersson Simona Silvia Merola Adrian Irimescu Bianca Maria Vaglieco Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV Applied Sciences H2 substitute helium mixing properties PIV optical investigation |
| title | Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV |
| title_full | Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV |
| title_fullStr | Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV |
| title_full_unstemmed | Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV |
| title_short | Analysis of Vorticity and Velocity Fields of Jets from Gas Injector Using PIV |
| title_sort | analysis of vorticity and velocity fields of jets from gas injector using piv |
| topic | H2 substitute helium mixing properties PIV optical investigation |
| url | https://www.mdpi.com/2076-3417/15/11/6180 |
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