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为了研究离心式喷嘴出口液膜破碎以及雾化锥角变化规律,对直径2.5~6 mm之间6个不同直径、不同几何特性参数的离心式喷嘴运用高速阴影设备进行实验,喷注压降从0.1~3 MPa,每次实验间隔0.2 MPa。通过实验,得到液膜破碎长度、液膜锥角随喷注压降、喷孔直径以及几何特性参数的变化规律。随着喷注压降的增加,液膜破碎长度减小,液膜锥角增大,该种类型喷嘴破碎长度在40 mm左右,液膜锥角不大于60°;随着几何特性参数A值增加,同一喷注压降下的液膜破碎长度增大,液膜锥角增加;将液膜锥角实验结果与Abromvich,Lefebvre等理论公式进行了比较,在常用的喷嘴特性参数范围内,液膜锥角的变化趋势与理论公式相吻合,但实验值远小于公式计算值。
In order to study the variation of liquid film fragmentation and atomization cone angle at the exit of centrifugal nozzle, six kinds of centrifugal nozzles with different diameters and different geometrical parameters between 2.5 ~ 6 mm in diameter were tested by high-speed shadowing device. The pressure drop from 0.1 ~ 3 MPa, each experiment interval 0.2 MPa. The experimental results show that the length of the liquid film, the cone angle of the liquid film change with the pressure drop, the diameter of the orifice and the geometrical parameters. With the increase of injection pressure drop, the length of the liquid film is reduced and the cone angle of the liquid film is increased. The length of this type of nozzle is about 40 mm and the taper angle of the liquid film is not more than 60 °. With the geometric parameter A Increase, the same jet pressure drop under the liquid film crushing length increases, the cone angle increased; the liquid film cone angle experimental results and Abromvich, Lefebvre other theoretical formula were compared in the range of commonly used nozzle parameters, the liquid The trend of membrane taper angle is consistent with the theoretical formula, but the experimental value is far less than the calculated value of the formula.