Elucidation of the gas flow and droplet behavior near the liquid sheet at the nozzle exit of the hollow-cone spray

阐明空心锥形喷雾喷嘴出口处液层附近的气流和液滴行为

• 批准号: 05650196
• 负责人: TAKAGI Toshimi
• 金额: $ 1.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650196/
• 关键词: Hollow-cone Spray; Phase-Doppler Technique; Laser Sheet; Numerical Simulation; Liquid Sheet Behavior; Droplet Behavior; 位相ドップラ法; 渦巻き噴射弁; ガス流動; 液膜形状; 表面張力; 数値シミュレーション

Behavior of droplets and the air flow in a hollow-cone spray was studied paying atteintion to the hollow-cone liquid sheet formed at the atomizer orifice. The shape of the liqiud sheet was investigated by taking photographs with a flush of Nd-YAG pulse laser. Phase Doppler method was used to detect the behavior of the droplets adjacent to the break-up point of the liquid sheet. Numerical simulation was carried out to compare the experiments to the predictions. The results obtained are as follows.(1) The cone angle of the liquid sheet formed at the atomizer orifice tends to converge or decrease along with the flow. The instantaneous angle is less than that of the observed time-averaged envelop of the liquid sheet. The direction of the liquid sheet flow at the break-up point dominates the initial droplet velocity and its direction. The shape is related to the surface tension of the liquid sheet.(2) The break-up point of the liquid sheet fluctuates up and down and the initial droplet velocity and the direction fluctuates significantly.(3) Numerical simulation incorporating the existence of the liquid sheet reveals that the the movement of the liquid sheet induces strong air stream and that this air stream selectively transports small droplets and plays an essintial role in classification of droplets by size and dispersion of droplets.

研究了空心锥喷雾中液滴和气流的行为，重点关注雾化器孔口处形成的空心锥液层。通过用 Nd-YAG 脉冲激光冲洗拍照来研究液体片的形状。使用相位多普勒方法来检测邻近液层破裂点的液滴的行为。进行数值模拟以将实验与预测进行比较。得到的结果如下： (1)雾化孔口处形成的液片锥角随着流动而趋于收敛或减小。瞬时角度小于观察到的液体层的时间平均包络线的角度。破碎点处液层流动的方向决定了初始液滴速度及其方向。其形状与液层的表面张力有关。(2)液层的破碎点上下波动，液滴初始速度和方向波动较大。(3)结合液层存在的数值模拟表明，液层的运动会产生强烈的气流，该气流选择性地输送小液滴，对液滴尺寸和分散度的分类起着重要作用。 的水滴。

项目成果

中野 祥: "非定常噴霧火炎のパラメトリック解析" 第32回燃焼シンポジウム. 346-348 (1994)

Sho Nakano：“不稳定喷雾火焰的参数分析”第 32 届燃烧研讨会 346-348 (1994)。

Okamoto Tatsuyuki: "Mesurements of Droplets Begaviour Using Phase-Doppler Technique and Studies on Structure of Spray Flow Fields" Bulletin of the JSME,B. 59. 349-354 (1993)

冈本达幸：《使用相位多普勒技术测量液滴行为及喷雾流场结构的研究》JSME通报，B。

岡本達幸: "位相ドップラー法を用いた滴挙動の計測と噴霧流の構造に関する研究" 日本機械学会論文集B編. 59. 349-354 (1993)

Tatsuyuki Okamoto：“使用相位多普勒方法测量液滴行为和喷雾流结构的研究”日本机械工程师学会会刊，B 版 59. 349-354 (1993)。

Takagi Toshimi: "Numerical Simulation of Mixing and Combustion in Transient Spray" Int.Symposium of COMODIA 94. 397-402 (1994)

Takagi Toshimi：“瞬态喷雾中混合和燃烧的数值模拟”Int.Symposium of COMODIA 94. 397-402 (1994)

Okamoto, Tatsuyuki: "Studies on the Behavior of Droplets and the Air Flow in the Spray (Hollow-cone Spray)" Bulletin of the JSME,B. 60. 367-374 (1994)

冈本龙之：“喷雾（空心圆锥喷雾）中液滴行为和气流的研究”JSME 通报，B。