拡かく大だい管かん

noun

expanding pipe; diffuser; expander; reducer

Technical term in engineering contexts for a pipe section that changes diameter to expand or reduce flow cross-section. The English glosses cover different functional aspects: an expanding pipe increases diameter, a diffuser slows flow and increases pressure, an expander is a tool or device for enlarging, and a reducer decreases diameter. In Japanese, 拡大管 can refer to any of these depending on context.

• この配はい管かんシステムには拡かく大だい管かんが使つかわれている。

  An expanding pipe is used in this piping system.

• 拡かく大だい管かんの設せっ計けいでは、流ながれの剥はく離りを防ふせぐことが重じゅう要ようだ。

  In the design of a diffuser, preventing flow separation is important.