The injection and atomization characteristics of angled water jet in Mach 2 air crossflow were investigated in the current paper. The angle of the jet was set to be 60°, 90°, and 120° to the crossflow. Experiments were carried out in a rectangular wind tunnel and the jet was introduced through a plain orifice injector. The shock patterns, flow topologies and spray boundaries were visualized by the High-speed Shadowgraph technique from the side view of the jet, while the lateral extension was obtained by Particle Image Velocimetry (PIV) approach using the top view image. An in-house image process was developed to search for the most unstable point in the digital image and a corresponding definition of jet penetration was presented. The boundary capture method presented in the current paper is not threshold based so the unique jet boundary without any manual effect can be obtained. Finally the corresponding empirical penetration correlation for the angled jet in supersonic crossflow derived using the High-speed Shadowgraph technique was obtained. It can be concluded that a larger injection angle may lead to wider lateral extension, higher penetration and larger bow shock wave angle.
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