一种新型自吸式喷嘴喷射性能初步研究

建立实验装置,研究一种带凸形圆环结构的新型自吸式气液二相喷嘴的吸气溶氧性能。以吸上真空度和溶解氧为目标,考察喷射口直径、凸形圆环缩颈直径与喷射口直径比、锥形喷射口与凸形圆环缩颈上端间距离等参数对喷嘴喷射性能的影响,并与普通喷嘴对比。结果表明:上述3个参数均能影响溶氧能力,而喷射口直径、凸形圆环缩颈直径与喷射口直径比则主要影响吸上真空度;相同液体流量下,新型喷嘴吸上真空度和溶氧能力均好于普通喷嘴;较优的结构参数是喷射口直径D、凸形圆环缩颈直径与喷射口直径比为1.2、锥形喷射口与凸形圆环缩颈上端间距离则为4D。

Preliminary study on ejecting performance of a novel self-sucking nozzle

A novel gas-liquid self-sucking nozzle with inward-convex annulus structure was equipped to study the dissolution of oxygen.By using aspiratory vacuum and concentration of dissolved oxygen as objective,some parameters influencing the ejecting performance,including the diameter of jet orifice,the ratio of diameter of inward-convex annulus bottleneck to jet orifice,and the distance between the outlet of jet orifice and the upper extreme of bottleneck of convex annulus,were investigated.The performance of novel nozzle also was compared with that of ordinary jet aerator.The results show that all of three parameters mentioned influence the concentration of dissolved oxygen,and the diameter of jet orifice,the ratio of diameter of inward-convex annulus bottleneck to jet orifice mainly influence the aspiratory vacuum.The novel nozzle has better performances for aspiratory vacuum and concentration of dissolved oxygen,compared with that of ordinary jet aerator when liquid flow is the same.The optimum conditions for nozzle performance obtained in the investigation are as follows: when the diameter of jet orifice is D,the distance between the outlet of jet orifice and the upper end of bottleneck of convex annulus is 4D,and the ratio of diameter of convex annulus bottleneck to jet orifice is 1.2.