真空环境中压电激励对射流破碎特性的影响  

Effect of piezoelectric excitation on jet fragmentationin vacuum environment

作　　者：陈鹏飞 严小平[3] 孙策 洪流 夏益志 CHEN Pengfei;YAN Xiaoping;SUN Ce;HONG Liu;XIA Yizhi(Science and Technology on Liquid Rocket Engine Laboratory,Xi'an 710100,China;Xi'an Aerospace Propulsion Institute,Xi'an 710100,China;Academy of Aerospace Propusion Technology,Xi'an 710100,China)

机构地区：[1]液体火箭发动机技术重点实验室,陕西西安710100 [2]西安航天动力研究所,陕西西安710100 [3]推进技术研究院,陕西西安710100

出　　处：《火箭推进》2020年第4期46-53,共8页Journal of Rocket Propulsion

基　　金：国防科研项目(30504050204)。

摘　　要：针对真空环境中压电激励液滴生成技术,采用实验方法研究了压电激励波形、频率和位移等参数对射流破碎特性的影响规律。实验结果表明,对0.5 mm的射流在理论最优频率下施加振幅3μm的压电激励作用后,射流破碎距离缩短至90 mm左右;相对于正弦波与三角波,方波激励获得的射流破碎距离最短;在最优频率附近,随着激励频率增大,液滴粒径减小,射流破碎长度先减小后增大;随着压电装置位移幅值增大,射流破碎长度略有减小。结果表明:在压电作用下,激励频率对射流特性影响较大,并且射流最短破碎距离对应的激励频率大于理论最优频率;激励波形和位移振幅等参数对射流破碎特性的影响相对较小。Aiming at droplet generation technology in vacuum environment,the effects of piezoelectric excitation waveform,frequency and displacement on jet fragmentation were studied by experimental research.The results show that after the piezoelectric excitation of 3μm is applied to the jet with diameter 0.5 mm at the theoretical optimal frequency,the breaking distance of the jet is shortened to about 90 mm.Compared with the sinusoidal and triangular waves,the jet breaking distance obtained by square wave excitation is the shortest.Near the optimal frequency,with the increase of excitation frequency,droplet diameter decreases,and jet breakup length decreases first and then increases.With the increase of piezoelectric displacement amplitude,jet breakup length decreases slightly.It is found that under the action of piezoelectric force,the excitation frequency has the great influence on jet characteristics,and the frequency corresponding to the shortest breaking distance is larger than the theoretical optimal frequency.The parameters such as excitation waveform and displacement amplitude have relatively small influence on jet breaking characteristics.

关 键 词：液滴发生器 真空环境 压电激励 实验研究 射流破碎 

分 类 号：V419[航空宇航科学与技术—航空宇航推进理论与工程]