ARTICLE:

• Zero-Net-Mass-Flow Jets in Cross-flow  download article

S. Tomar
Laboratory for Turbulence Research in Aerospace & Combustion (LTRAC), Department of Mechanical Engineering, Monash University, Melbourne, Australia

J. Arnaud
Laboratory for Turbulence Research in Aerospace & Combustion (LTRAC), Department of Mechanical Engineering, Monash University, Melbourne, Australia

Julio Soria
Department of Mechanical Engineering, Monash University, Melbourne, Australia

ABSTRACT

The structures of circular and elliptical zero-net-mass-flow jets in crossflow (ZNMF-JICF) have been investigated using planar induced fluorescence (PLIF). The flow structure of these jets in a crossflow arrangement is primarily characterized by the Reynolds number (Re), the Strouhal number (St) and the velocity ratio (VR). The prime focus of this study is to investigate the effect of different VR and St numbers on the structure of circular and elliptical ZNMF-JICF, particularly the mean structure. The Reynolds number for all the ZNMF-JICF experiments was kept constant at 1066. Two distinct flow regimes are observed namely single trajectory and multiple trajectory jets. Single trajectory jets demonstrate mixing of the bulk of the fluid outside the upstream boundary layer, while multiple trajectory ZNMF-JICF can penetrate more deeply into the ambient cross-flow. The investigation of the elliptical ZNMF-JICF was carried out for AR of 2 and 3. Ensemble-averaged PLIF images of the ZNMF jet exhausting normally into a cross flow with VR of 2 and 3 have been studied and compared for both the circular and elliptical jets.

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