Aeroacoustics

End-plate for noise-by-flow control in axial fans

“…As a consequence of the role that organised structures in turbulent flow play in the noise generation process, controlling these structures is a key objective in noise suppression [30]. Experimental and numerical studies have demonstrated the reduction in fan noise that results from adopting tip leakage flow control technologies [31][32][33], were the authors speculated on the role of blade tip leakage vortex bursting on an industrial fan's aerodynamic and acoustic performance.…”

Fluid flow and sound generation at hydrothermal vent fields

“…Sound production by turbulent jets is a complicated process and extensive theoretical and laboratory work has examined the exact directionality, frequency, and power of sound from low to high Mach number (M) jets (Lighthill, 1954;Ffowcs Williams, 1977;Lush, 1971;Laufer and Yen, 1983;Goldstein, 1984;Powell, 1964;Dowling et al, 1978;Mankbadi, 1985;Cohen and Wygnanski, 1987). There are however, very few experimental results on very low Mach number jets (Jorgensen, 1961).…”

Unsteady Boundary Layers with an Intelligent Numerical Scheme.

“…Useful reviews of the topic have been provided by Riley (1975), Williams (1977), Shen (1978, Telionis (1979) and Cebeci (1982).…”