急拡大・縮小流路流れの流体力学的特性

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  • Hydrodynamic Characteristics of Flow in a Channel with a Suddenly Expanded and Contracted Part.
  • キュウ カクダイ シュクショウ リュウロ ナガレ ノ リュウタイ リキガクテキ

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Characteristic properties of flow in a two-dimensional symmetric channel with a suddenly expanded and contracted part are investigated numerically and experimentally. It is predicted that there occur three distinct types of flow in the channel depending upon the Reynolds number, which are symmetric steady flow, asymmetric steady flow and asymmetric time-periodic flow. The three types of flow are confirmed to occur experimentally by flow visualization technique. Pressure distribution along the center line of the channel is evaluated numerically. Especially, the pressure difference across the expanded and contracted part of the channel is investigated in detail. It is concluded that the pressure difference is not largely affected by the type of the flow but differs depending on Reynolds number.

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