Abstract
This paper reports an experimental investigation on the zone between two parallel planar jets in a crossflow, termed as the interaction zone. The experiment was conducted using 2D PIV measurement, which involves a test matrix designed for a parametric study. Based on both mean and instantaneous results, effects of different parameters, i.e. front jet velocity, space between the two jets, and crossflow flow velocity, on the interaction zone were analysed. The two coupled recirculation structures, size, velocity field, and turbulence characteristics of the interaction zone are discussed. In addition, the large-scale vortices inside the interaction zone were recognised using Γ1 value. How these different parameters affect the evolution of these vortices was also studied.
Highlights
Tandem jets in a crossflow (TJCF) can be found in a number of engineering applications, e.g. lift jets of V/STOL aircraft, turbine blade cooling, and flow-induced noise reduction.[1,2,3] As a generic flow regime, extensive studies, especially in experiment[4,5,6,7,8,9,10,11,12,13,14,15] have been performed for both research and engineering interest
Two obvious recirculation structures can be observed inside the interaction zone
Discussions were made on the characterisation of the interaction zone (IZ), i.e. the two coupled recirculation structures, size, velocity and turbulence field of the IZ
Summary
Tandem jets in a crossflow (TJCF) can be found in a number of engineering applications, e.g. lift jets of V/STOL aircraft, turbine blade cooling, and flow-induced noise reduction.[1,2,3] As a generic flow regime, extensive studies, especially in experiment[4,5,6,7,8,9,10,11,12,13,14,15] have been performed for both research and engineering interest. In addition to the defection, the shielding from the front jet has been found to have more impact on the rear jet, in terms of decay rate of the mean centerline velocity,[12] jet spreading,[12] entrainment,[14] vortices,[14] etc. When it comes to vortex dynamics, two groups of vortices[16] have been identified in the traverse jet in a crossflow. Based on the 2D-PIV measurement, a parametric analysis was conducted to compare the effects on the IZ Both mean and instantaneous results are reported in this paper, encompassing two coupled recirculation structures, velocity field, turbulence characteristics and large-scale vortices
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