In this paper wall pressure fluctuations induced by a subsonic coaxial jet grazing a wing have been experimentally investigated. The wall pressure signature on the wing was characterised in both static and flight conditions. This study is part of a broader research activity that has been carried out during the Collaborative European project JERONIMO (ACP2-GA-2012-314692) funded under the 7th Framework Programme. Measurements presented therein have been performed in the CEPRA 19 large-scale wind tunnel facility where an instrumented scaled wing model was installed close to a coaxial compressible jet. The pressure field on the wing was measured by flush-mounted pressure transducers installed on the pressure side. Experiments were carried out with the coaxial jet operating in single-stream-like jet conditions, i.e. with same flow conditions for the primary and secondary jets, at two different Mach numbers Mj=0.6 and Mj=0.75. Flight effect was explored for the jet flow condition Mj=0.75, with the flight-stream Mach number Mf set equal to 0.18. Data were analysed in time and frequency domains and particular attention was devoted to determine universal scalings of the spectral quantities. Semi-empirical models commonly used in canonical turbulent boundary layers to reproduce the wall pressure coherence are tested and verified for both the static and flight conditions.
Meloni, S., Mancinelli, M., Camussi, R., Huber, J. (2019). Wall pressure fluctuations induced by a compressible coaxial jet in installed configuration. In 25th AIAA/CEAS Aeroacoustics Conference, 2019. American Institute of Aeronautics and Astronautics Inc, AIAA [10.2514/6.2019-2710].