ノズル噴孔内のキャビテーションが液体噴流の微粒化に及ぼす影響〔熱工学, 内燃機関, 動力など〕

概要

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The purpose of this investigation is to clarify the atomization mechanism of a high speed liquid jet which issued from a single hole nozzle. The breakup process of the liquid jet is thought to be greatly affected by the behavior of the internal flow in the nozzle hole. In order to investigate this, visualization of the flow in the nozzle hole, observation of the atomization of the liquid jet and measurement of the static pressure in the nozzle hole were performed under atmospheric conditions using transparent nozzles with various length-to-diameter ratios of holes, L/D. A non-dimensional pressure coefficient in the nozzle hole was defined by C_p=(p_c-p_v)/(p_a-p_c), where p_c is the static pressure at 1mm from the inlet of the nozzle hole, p_v is vapor pressure of water at 293 K and p_a is ambient pressure. The behavior of the internal flow in the nozzle hole where cavitation occurs was arranged by using c_p. It was clarified that the primary factor in the atomization of the liquid jet is the disturbance of the liquid flow resulting from cavitation phenomena.
一般社団法人日本機械学会の論文
1997-10-25