衝撃圧によって駆動される高速液体噴流の流動特性に関する研究 : 第1報,一次元流動モデルによるノズル内流れの解析

概要

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Unsteady flow through a taper nozzle produced by piston impact is examined by numerical analysis, pressure measurements and jet photographs. in the numerical analysis, Tait's equation of state and the homogeneous model of vapor cavities are employed for one-dimensional flow in a pipe with an area change. The flow velocity is rapidly increased by the incident pressure in the taper section. Vapor cavities are formed during flow-velocity decreases at the nozzle outlet. The cavitation also spreads into the water column from the piston front because the piston separates from the column due to the reflection of the impact pressure. The density and the velocity of flow change discontinuously at the interface between the cavitation and the water. It is illustrated that the nozzle opening ratio effects the jet speed.
1988-07-25