双激励超音速气体雾化喷嘴共振特性的数值研究  

Properties of Acoustic Resonance in a Double Actuator Ultra-Sonic Gas Nozzle: a Numerical Study

作　　者：祖洪彪[1] 周哲玮[1] 王志亮[1] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海市力学在能源工程中的应用重点实验室,上海200072

出　　处：《应用数学和力学》2012年第12期1379-1391,共13页Applied Mathematics and Mechanics

基　　金：国家自然科学基金资助项目(10772107;10702038;11172163);上海市教委科研创新资助项目(08YZ10);上海市科委资助项目(09DZ1141502);上海高校创新团队建设项目

摘　　要：超音速气体雾化(ultra-sonic gas atomization,USGA))喷嘴是实现喷射雾化的重要装置,它能够产生脉动的超音速气流,获得较小的平均粒径和集中的粒径分布.在USGA喷嘴的共振管端部引入了主动的激励信号,组成双激励式超音速气体雾化器,并对超音速气体雾化器内部Hart-mann腔体气体流场在无激励/有激励情况下所产生的气体振动特性进行了数值研究.结果表明在主动激励器的作用下,超音速气体雾化器内气流的振动效果如振幅和起振特性等都得到了有效的加强.研究发现超音速气体雾化器存在多个气体受激振动的共振频率,其对应于两类不同的共振模式,"Hartmann模式"和"全局模式".双激励器信号的频率、激励幅度及相位差改变都能够有效地改变超音速气流的振动特性.研究同时阐明了Hartmann共振管和二次共振管在USGA喷嘴腔体内产生气体脉动时的联动特点.Ultra-sonic gas atomization （USGA） nozzle was an important apparatus in the metal liquid air-blast atomization process. It could generate oscillating supersonic gas efflux, which was proved effective to enforce the atomization and produce narrow-band particle distributions. A double actuator ultra-sonic gas nozzle by joining up two active signals at the ends of the reso- nance tubes, was proposed. Numerical simulations were adopted to study the effects of flow development on acoustic resonant properties inside the Hartanann resonance cavity with/with- out actuator. Comparisons showed the strength and onset process of oscillating were enhanced remarkably with actuators. Multiple oscillating amplitude peaks were found on response curves, and two kinds of typical behaviors, i. e., the ＂Hartmann mode＂ and the ＂global mode＂, were discussed for those corresponding frequencies. The results for two driving actua- tors were also investigated. When changing the amplitudes, frequencies or phase difference of the input signals by the actuators, the oscillating amplitudes of gas efflux could be altered effec- tively.

关 键 词：喷射雾化 超音速气体雾化喷嘴 共振 数值模拟 

分 类 号：O354.2[理学—流体力学]