THE IMPACT OF A VORTEX GENERATOR ON A MIXTURE OF A JET WITH A MAINSTREAM FLOW OVER A FLAT PLATE
This work investigates the effects of adding vortex generators (VGs) in front of twin injection holes drilled on a flat plate geometry. To analyse the improvement of heat transfer, VGs are positioned at three different locations: 0D, D, and 3D upstream of the injection holes. The configurations used...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Faculty of Engineering, University of Kufa
2025-07-01
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| Series: | Mağallaẗ Al-kūfaẗ Al-handasiyyaẗ |
| Subjects: | |
| Online Access: | https://journal.uokufa.edu.iq/index.php/kje/article/view/17888 |
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| Summary: | This work investigates the effects of adding vortex generators (VGs) in front of twin injection holes drilled on a flat plate geometry. To analyse the improvement of heat transfer, VGs are positioned at three different locations: 0D, D, and 3D upstream of the injection holes. The configurations used are prism-shaped VG of height = D, 1.5D, 2D, and 3D, with an inclination angle of 0° to 40°, and a blowing ratio of M=1.0. Using the commercial CFD code StarCCM+, the focus is on temperature distribution to examine the improvement of the injected jet coverage on the wall. The sst k-w turbulence model of the Reynolds-averaged Navier-Stokes method (RANS) is used to model the turbulent flow over a flat plate. The accuracy of the RANS approach to predict the jet in crossflow interaction (JICF) is evaluated in this study. The effective operation of this cooling enhancement is demonstrated by the region covered by the injected air along the flow direction. The results showed that the VG location is the crucial factor that controls the jet coverage. Compared to the base hole, the cooling performance produced by the VGs design exhibits obvious enhancement at all VGs locations. The jet footprint of the VG cases is larger than that of the base hole. Besides, it was also shown that the VG technique applied in the current research decreases the mixing process between the mainstream air and the secondary jet and enhances the coverage level. It was also found that the VGs generate strong reverse vortices moving against the main vortices, which destroys their undesirable effects and reduces the jet lift-off effect which then keeps the jet attached to the wall. In conclusion, the simulation results indicate a greater coverage area can be achieved when the VG is mounted at an upstream location too far from the injection hole
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| ISSN: | 2071-5528 2523-0018 |