管内多孔板からの渦放出に伴う圧力脈動 : ロックイン発生時の管内変動圧力モード(機械力学,計測,自動制御)

概要

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The pressure fluctuation cased by a ring vortex shedding from a perforated plate with holes installed in a pipe was investigated experimentally. When a lock-in phenomenon is generated, the pressure fluctuation amplitude increases markedly. The displacement of the perforated plate has a slight phase lag with respect to the differential pressure fluctuation across the plate. The amplitudes and phases of pressure fluctuation along the pipe agree well with that calculated using continuity equation at the plate location under the non-cavitating condition. It was also found that these results are similar to the pressure fluctuation cased by the lateral vibration of the perforated plate excited axially by a piezoelectric element. But during the cavitation occurrence the amplitudes and phases of pressure fluctuation deviate from the values for the non-cavitation, while the lock-in frequencies decrease gradually with increasing velocity.
一般社団法人日本機械学会の論文
2002-06-25