Studying the effect of flap angle on the noise of interaction of a high-bypass jet with a swept wing in a co-flow

Simulation of Isolated and Installed Jet Noise at Mach = 0.9: Influence of Numerical Mesh and Physical Insights

“…33 for four positions of the axial antenna. There are no experimental data available for the observation angle θ = 120° but jet-plate interaction noise is known to be large at aft angles (Lawrence and M. A. and R. H. Self 2011;Belyaev et al 2017;Ffowcs Williams and Hall 1970), hence the interest for its analysis. Isolated jet experimental and numerical data (Mesh 3, porous surface S0, T = 2100 D/U j ) are also reproduced in the figure for reference and illustration of installation effect on noise.…”

“…Jet installation noise has been widely investigated experimentally over the years for both simplified (Head and Fisher 1976;Cavalieri et al 2014;Lawrence and Self 2011;Piantanida et al 2016;Bychkov and Faranosov 2018) and more realistic, industrial-like configurations (Perrino 2014;Lyubimov et al 2014;Belyaev et al 2017). Among others, Lawrence et al performed an extensive experimental campaign for various axial and radial distances between the jet and the trailing edge of the plate as well as jet Mach number (Lawrence and M. A. and R. H. Self 2011).…”

Plasma-based active closed-loop control of instability waves in unexcited turbulent jet. Part 2. Installed jet.

“…In practice, such conditions may be realized for jetunder-the-wing configurations with not very large flap deflection angles. 12 This allowed developing simple models, in which the field interacting with the plate trailing edge is modeled by the superposition of the near-field evanescent waves of different azimuthal numbers as if the plate is absent. 6,10,11,[13][14][15][16][17] In the current study, we are also focused on the configuration when the plate is not intruded into the jet shear layer so that linear mechanism of low-frequency installation noise is valid.…”

“…Particularly, at low and moderate frequencies, it may cause the occurrence of an additional efficient noise source associated with the interaction between the hydrodynamic near field of the jet and the wing trailing edge. [5][6][7][8][9][10][11][12][13][14][15][16][17] To reduce jet-wing installation noise, several approaches can be used. Most popular methods are related to the modifications of nozzle-wing geometry: nozzle modifications or wing/flaps modifications.…”

“…Most popular methods are related to the modifications of nozzle-wing geometry: nozzle modifications or wing/flaps modifications. 3,4,7,10,12 However, changing of the baseline geometry may not be optimal from aerodynamic point of view. Therefore, development of noise reduction technologies, not requiring geometrical modifications, is valuable.…”