A hypersonic cavity flow induced noise passive control device and control method

Abstract

The application discloses a kind of hypersonic speed cavity flow induced noise passive control device and control method, it is suitable for Mach number 4.0 flow M219 classic open cavity, its size is normalized with the cavity depth as benchmark, cavity length-width-depth ratio 5:1:1, at the bottom of cavity downstream, from the front wall, setting integrated three-dimensional small-size continuous triangular pyramid turbulence device, length-width-height size is,, Using aviation titanium alloy or high-temperature alloy;The installation position is determined by IDDES simulation, the scale of downstream backflow vortex is reduced by using turbulence structure, the impact of bottom wall is weakened, self-sustaining oscillation is inhibited, the peak value of Rossiter low-frequency mode is reduced, and the maximum total sound pressure level is reduced by about 4dB.The application is pure passive control, without additional energy consumption, simple structure, suitable for noise suppression of cavity structure such as internal embedded bomb cabin of hypersonic vehicle.

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