2712 スパン方向に位相を変えた間欠噴流によるキャビティ音の抑制(J20-3 流体関連の騒音と振動(3) 流れの制御と騒音,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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The purpose of this study is to create an energy efficient active control device that can suppress the cavity noise. New control devices using a plate-mounted rotating cylinder or fluidic oscillators are developed and their noise suppression effects are evaluated under conditions when the oncoming boundary layer is laminar or turbulent. The experiment is conducted in a low-turbulence wind tunnel and the devices are installed at the center of upstream edge of the cavity. These devices are designed to generate intermittent jets. It is found that the device using a plate-mounted rotating cylinder provides effective noise suppression for the turbulent separating flow case. In addition, it is shown that the peak cavity noise can be completely suppressed by the single-fluidic device for a laminar separating flow case. In a turbulent separating flow case, it is shown that it is necessary to install two fluidic devices side by side at the upper-edge of the cavity, in order to effectively reduce the cavity noise.
社団法人日本機械学会の論文
2008-08-02