What is it about?
In this work we study experimentally the flow structure and flow dynamics of submerged tranverse impinging turbulent twin-jet flows discharged into a confined laminar crossflow. Flow measurements in several planes of the test section are acquired to assess the confinement effect of the bounded jets. Flow visualization images reveal the dependence of the exit velocities of the jets on the trajectory, penetration, crossflow entrainment and lateral spreading of the twin jets. In addition, coherent structures that appear alternately along the jets' columns confirm that these structures undergo two or three stages of vortex pairing prior to the vortex breakdown activity.
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Photo by Marc Wieland on Unsplash
Why is it important?
The flow structure and flow dynamics of twin-jet flows discharged into a crossflow is highly complex, unsteady, three-dimensional, and their trajectories deviate from straight lines because of mutual entrainment of the surrounding fluid. Despite the work that has been undertaken to understand the structure of impinging twin-jet flows in crossflow, practically no information on the flow field structures associated with the confinement effect is available. The main purpose of this investigation is to evaluate the effect of the relevant parameters on the flow structure and interactions, trajectory, penetration, crossflow entrainment and lateral spreading of the twin jets.
Perspectives
I hope that this article makes people curious about the complexity of turbulent impinging jets.
Dr. Lorenzo Martínez-Suástegui
Instituto Politecnico Nacional
Read the Original
This page is a summary of: TR-PIV measurements of turbulent confined impinging twin-jets in crossflow, Experimental Thermal and Fluid Science, August 2022, Elsevier,
DOI: 10.1016/j.expthermflusci.2022.110667.
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