Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach
The occurrence of vortices in the sac volume of automotive multi-hole fuel injectors plays an important role in the development of vortex cavitation, which directly influences the flow structure and emerging sprays that, in turn, influence the engine performance and emissions. In this study, the RAN...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-11-01
|
| Series: | Fluids |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2311-5521/6/12/421 |
| _version_ | 1797504761074810880 |
|---|---|
| author | Aishvarya Kumar Jamshid Nouri Ali Ghobadian |
| author_facet | Aishvarya Kumar Jamshid Nouri Ali Ghobadian |
| author_sort | Aishvarya Kumar |
| collection | DOAJ |
| description | The occurrence of vortices in the sac volume of automotive multi-hole fuel injectors plays an important role in the development of vortex cavitation, which directly influences the flow structure and emerging sprays that, in turn, influence the engine performance and emissions. In this study, the RANS-based turbulence modelling approach was used to predict the internal flow in a vertical axis-symmetrical multi-hole (6) diesel fuel injector under non-cavitating conditions. The project aimed to predict the aforementioned vortical structures accurately at two different needle lifts in order to form a correct opinion about their occurrence. The accuracy of the simulations was assessed by comparing the predicted mean axial velocity and RMS velocity of LDV measurements, which showed good agreement. The flow field analysis predicted a complex, 3D, vortical flow structure with the presence of different types of vortices in the sac volume and the nozzle hole. Two main types of vortex were detected: the “hole-to-hole” connecting vortex, and double “counter-rotating” vortices emerging from the needle wall and entering the injector hole facing it. Different flow patterns in the rotational direction of the “hole-to-hole” vortices have been observed at the low needle lift (anticlockwise) and full needle lift (clockwise), due to their different flow passages in the sac, causing a much higher momentum inflow at the lower lift with its much narrower flow passage. |
| first_indexed | 2024-03-10T04:08:57Z |
| format | Article |
| id | doaj.art-2ae670e7dce9459eb55caab1d3304643 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-10T04:08:57Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-2ae670e7dce9459eb55caab1d33046432023-11-23T08:15:16ZengMDPI AGFluids2311-55212021-11-0161242110.3390/fluids6120421Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling ApproachAishvarya Kumar0Jamshid Nouri1Ali Ghobadian2Department of Engineering, Mechanical Engineering and Aeronautics, City, University of London, Northampton Square, London EC1V 0HB, UKDepartment of Engineering, Mechanical Engineering and Aeronautics, City, University of London, Northampton Square, London EC1V 0HB, UKDepartment of Engineering, Mechanical Engineering and Aeronautics, City, University of London, Northampton Square, London EC1V 0HB, UKThe occurrence of vortices in the sac volume of automotive multi-hole fuel injectors plays an important role in the development of vortex cavitation, which directly influences the flow structure and emerging sprays that, in turn, influence the engine performance and emissions. In this study, the RANS-based turbulence modelling approach was used to predict the internal flow in a vertical axis-symmetrical multi-hole (6) diesel fuel injector under non-cavitating conditions. The project aimed to predict the aforementioned vortical structures accurately at two different needle lifts in order to form a correct opinion about their occurrence. The accuracy of the simulations was assessed by comparing the predicted mean axial velocity and RMS velocity of LDV measurements, which showed good agreement. The flow field analysis predicted a complex, 3D, vortical flow structure with the presence of different types of vortices in the sac volume and the nozzle hole. Two main types of vortex were detected: the “hole-to-hole” connecting vortex, and double “counter-rotating” vortices emerging from the needle wall and entering the injector hole facing it. Different flow patterns in the rotational direction of the “hole-to-hole” vortices have been observed at the low needle lift (anticlockwise) and full needle lift (clockwise), due to their different flow passages in the sac, causing a much higher momentum inflow at the lower lift with its much narrower flow passage.https://www.mdpi.com/2311-5521/6/12/421vortex flowmulti-hole injectorsac volumeCFD simulationsRANS modelprediction validation |
| spellingShingle | Aishvarya Kumar Jamshid Nouri Ali Ghobadian Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach Fluids vortex flow multi-hole injector sac volume CFD simulations RANS model prediction validation |
| title | Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach |
| title_full | Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach |
| title_fullStr | Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach |
| title_full_unstemmed | Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach |
| title_short | Predictions of Vortex Flow in a Diesel Multi-Hole Injector Using the RANS Modelling Approach |
| title_sort | predictions of vortex flow in a diesel multi hole injector using the rans modelling approach |
| topic | vortex flow multi-hole injector sac volume CFD simulations RANS model prediction validation |
| url | https://www.mdpi.com/2311-5521/6/12/421 |
| work_keys_str_mv | AT aishvaryakumar predictionsofvortexflowinadieselmultiholeinjectorusingtheransmodellingapproach AT jamshidnouri predictionsofvortexflowinadieselmultiholeinjectorusingtheransmodellingapproach AT alighobadian predictionsofvortexflowinadieselmultiholeinjectorusingtheransmodellingapproach |