Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport
The interaction of a turbulent, spatially developing crossflow with a transverse jet possesses several engineering and technological applications such as film cooling of turbine blades, exhaust plumes, thrust vector control, fuel injection, etc. Direct Numerical Simulation (DNS) of a jet in a crossf...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/12/4296 |
| _version_ | 1797487854942683136 |
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| author | Carlos Quiñones Guillermo Araya |
| author_facet | Carlos Quiñones Guillermo Araya |
| author_sort | Carlos Quiñones |
| collection | DOAJ |
| description | The interaction of a turbulent, spatially developing crossflow with a transverse jet possesses several engineering and technological applications such as film cooling of turbine blades, exhaust plumes, thrust vector control, fuel injection, etc. Direct Numerical Simulation (DNS) of a jet in a crossflow under different streamwise pressure gradients (zero and favorable pressure gradient) is carried out. The purpose is to study the physics behind the transport phenomena and coherent structure dynamics in turbulent crossflow jets at different streamwise pressure gradients and low/high-velocity ratios (0.5 and 1). The temperature was regarded as a passive scalar with a molecular Prandtl number of 0.71. The analysis is performed by prescribing accurate turbulent information (instantaneous velocity and temperature) at the inlet of a computational domain. The upward motion of low-momentum fluid created by the “legs” of the counter-rotating vortex pair (CVP) encounters the downward inviscid flow coming from outside of the turbulent boundary layer, inducing a stagnation point and a shear layer. This layer is characterized by high levels of turbulent mixing, turbulence production, turbulent kinetic energy (TKE) and thermal fluctuations. The formation and development of the above-mentioned shear layer are more evident at higher velocity ratios. |
| first_indexed | 2024-03-09T23:53:45Z |
| format | Article |
| id | doaj.art-9c595d9a857c4a53bcb83260928b2415 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T23:53:45Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9c595d9a857c4a53bcb83260928b24152023-11-23T16:28:47ZengMDPI AGEnergies1996-10732022-06-011512429610.3390/en15124296Jet in Accelerating Turbulent Crossflow with Passive Scalar TransportCarlos Quiñones0Guillermo Araya1HPC and Visualization Laboratory, Department of Mechanical Engineering, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681, USAHPC and Visualization Laboratory, Department of Mechanical Engineering, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681, USAThe interaction of a turbulent, spatially developing crossflow with a transverse jet possesses several engineering and technological applications such as film cooling of turbine blades, exhaust plumes, thrust vector control, fuel injection, etc. Direct Numerical Simulation (DNS) of a jet in a crossflow under different streamwise pressure gradients (zero and favorable pressure gradient) is carried out. The purpose is to study the physics behind the transport phenomena and coherent structure dynamics in turbulent crossflow jets at different streamwise pressure gradients and low/high-velocity ratios (0.5 and 1). The temperature was regarded as a passive scalar with a molecular Prandtl number of 0.71. The analysis is performed by prescribing accurate turbulent information (instantaneous velocity and temperature) at the inlet of a computational domain. The upward motion of low-momentum fluid created by the “legs” of the counter-rotating vortex pair (CVP) encounters the downward inviscid flow coming from outside of the turbulent boundary layer, inducing a stagnation point and a shear layer. This layer is characterized by high levels of turbulent mixing, turbulence production, turbulent kinetic energy (TKE) and thermal fluctuations. The formation and development of the above-mentioned shear layer are more evident at higher velocity ratios.https://www.mdpi.com/1996-1073/15/12/4296DNScrossflow jetturbulent boundary layerpassive scalar |
| spellingShingle | Carlos Quiñones Guillermo Araya Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport Energies DNS crossflow jet turbulent boundary layer passive scalar |
| title | Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport |
| title_full | Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport |
| title_fullStr | Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport |
| title_full_unstemmed | Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport |
| title_short | Jet in Accelerating Turbulent Crossflow with Passive Scalar Transport |
| title_sort | jet in accelerating turbulent crossflow with passive scalar transport |
| topic | DNS crossflow jet turbulent boundary layer passive scalar |
| url | https://www.mdpi.com/1996-1073/15/12/4296 |
| work_keys_str_mv | AT carlosquinones jetinacceleratingturbulentcrossflowwithpassivescalartransport AT guillermoaraya jetinacceleratingturbulentcrossflowwithpassivescalartransport |