基于Hartmann谐振腔的雾化喷嘴声场流场特性

发布时间：2018-01-03 19:20

本文关键词：基于Hartmann谐振腔的雾化喷嘴声场流场特性　出处：《航空动力学报》2016年09期 　论文类型：期刊论文

【摘要】：采用试验与数值模拟相结合的方法研究了谐振腔孔径、谐振腔深度、谐振腔与射流喷孔距离以及喷嘴压比(NPR)对基于Hartmann谐振腔(HRT)的气动式超声波雾化喷嘴外部流场及声场的影响.结果表明:当喷嘴压比大于2时,喷嘴压比增大对声场频率影响较小;当喷嘴压比小于2时,谐振腔依然能够产生高频声场,但其频率较高喷嘴压比时产生的小.当谐振腔深度小于1倍射流喷孔孔径时,此时高频声场主要由射流的不稳定性引发,声场频率与谐振腔深度经验关系式此时并不适用;当谐振腔孔径大于1.75倍射流喷孔孔径时,声场频率大小有降低趋势.谐振腔与射流喷孔距离与声场频率关系紧密,当谐振腔放置在自由射流压力增大区域时,才可获得理想高频声场.
[Abstract]:The aperture and depth of the resonator are studied by the combination of experiment and numerical simulation. The distance between the cavity and the Jet Jet and the nozzle pressure ratio (Hartmann) based on the Hartmann Resonator. The effect of flow field and sound field on the external flow field and sound field of the pneumatic ultrasonic atomizing nozzle is obtained. The results show that when the pressure ratio of the nozzle is greater than 2:00. The increase of nozzle pressure ratio has little effect on the frequency of sound field. When the nozzle pressure ratio is less than 2:00, the cavity can still produce high frequency sound field, but its frequency is smaller than that when the nozzle pressure ratio is higher. At this time, the high frequency acoustic field is mainly caused by the instability of the jet, and the empirical relationship between the frequency of the sound field and the depth of the resonator is not applicable at this time. When the aperture of the cavity is larger than 1.75 times of the diameter of the jet hole, the frequency of the acoustic field will decrease, and the distance between the cavity and the jet nozzle is closely related to the frequency of the acoustic field. The ideal high frequency sound field can be obtained only when the cavity is placed in the region where the free jet pressure increases.
【作者单位】：厦门大学航空航天学院;
【基金】：国家自然科学基金(51406171) 中央高校基本科研业务费(20720150180) 福建省自然科学基金(2015J05111)
【分类号】：V233.2
【正文快照】： 对燃油喷嘴来说,在要求的工作范围内,需要获得尽可能细的油雾.当液体流量太大时(或液体黏性过大时),由于离心喷嘴喷口尺寸增加,喷嘴出口液膜增加,造成液体雾化质量恶化,液滴的索太尔平均直径(Sauter mean diameter,SMD)急剧增加.已有的研究表明:超声波雾化喷嘴的雾化性能一般

【参考文献】