長平板背後の流れのはく離領域に及ぼすスプリッター板の影響

概要

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An experimental investigation has been made on the separated flow region behind a long flat plate with a blunt trailing edge. The flow was controlled by an additional splitter plate fitted to the trailing edge along the wake center line. The length of the splitter plate, l, was varied from a half, to five times the trailing edge thickness, h. Measurements of pressure distributions and velocity fluctuation were made in the separated flow region under the freestream zero-pressure gradient. The pressure distribution on the wake center line was highly sensitive to the length of the splitter plate in the case of l / h<1. The similarity in the pressure distribution behind the base, using the splitter plate of l / h≧3, was observed in the present long flat plate when the results were plotted in the form proposed by Narayanan et al. for the backward facing step. The regular vortex shedding was suppressed by using the splitter plate of l / h≧3.