Section: Scientific Foundations

Experimental aspects

A great deal of experiments has been devoted to the study of jet in crossflow configurations. They essentially differ one from each other by the hole shape (cylindrical or shaped), the hole axis inclination, the way by which the hole is fed, the characteristics of the crossflow and the jet (turbulent or not, isothermal or not), the number of holes considered and last but not least the techniques used to investigate the flow. A good starting point to assess the diversity of the studies carried out is given by [30] . For inclined cylindrical holes, the experimental database produced by Gustafsson and Johansson (http://www.tfd.chalmers.se/~gujo/WS11_2005/Slanted_jet/INDEX.HTM ) represents a sound reference base and for normal injection, the work by [37] served as reference for LES simulations [34] . For shaped holes, the studies are less numerous and are aimed at assessing the influence of the hole shape on various flow properties such as the heat transfer at the wall [27] . In 2007, A. Most developed at UPPA a test facility for studying jet in crossflow issued from shaped holes [31] . The hole shape was chosen as a 12.5 scale of the holes (i.e. at scale 1) drilled by laser in a combustion chamber. His preliminary 2-component PIV results have been used to test RANS simulations [32] and LES [33] . This test facility will be used in the framework of the present project to investigate a 1-hole plane i.e. an isolated jet in crossflow. PIV and LDV metrology will be used.