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双超声波换能器分布方式对反应器内声场影响的数值模拟

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DOI:10.3969/j.issn.1672-3872.2023.23.006

基金项目:广西科技基地及人才专项(桂科AD20159084);2018年广西高校引进海外高层次人才“百人计划”

作者:蒋越,吴璇,王浩博,时全(广西科技大学机械与汽车工程学院,广西 柳州 545006)

 

摘 要:【目的】探究不同条件下超声波反应器内的声压分布情况,从而确定出空化强度最高的换能器分布方式,使得超声波反应器更高效。【方法】采用压力声学频域物理场,基于亥姆霍兹方程,对相同体积的超声波反应器的声场进行了数值模拟;考察了双换能器在不同分布方式下,反应器内的声压分布情况,并对比了不同条件下的平均声压值和空化占比。【结果】1)当双换能器位于同一安装面的情况下,双换能器位于底表面时,声压分布最稳定,空化占比最高,达到了24.74%。2)当双换能器位于不同安装面的情况下,双换能器位于前表面和底表面时,声压幅值最大,为2.9×105 Pa;平均声压也达到了最大值,为5.27×104 Pa;反应器内的空化占比达到了19.34%,是5种异面分布方式中的最大值。【结论】换能器的分布方式对超声波反应器内的空化强度 具有重要影响,通过数值模拟分析方法可对不同的换能器分布进行最优化分析,从而确定出最佳的换能器分布方式。

关键词:超声波反应器;超声波换能器;数值模拟;声压分布

 

Abstract: [Objective] To investigate the distribution of sound pressure in ultrasonic reactors under different conditions, in order to determine the distribution mode of the transducer with the highest cavitation intensity, making the ultrasonic reactor more efficient. [Method] The pressure acoustic frequency domain physical field was used, and based on the Helmholtz equation, the sound field of the same volume ultrasonic reactor was numerically simulated. We investigated the sound pressure distribution inside the reactor under different distribution modes of dual transducers, and compared the average sound pressure value and cavitation ratio under different conditions. [Result] 1) When the dual transducers are located on the same installation surface and the dual transducers are located on the bottom surface, the sound pressure distribution is the most stable and the cavitation proportion is the highest, reaching 24.74%. 2) When the dual transducers are located on different mounting surfaces, and the dual transducers are located on the front and bottom surfaces, the maximum sound pressure amplitude is 2.9×105 Pa; The average sound pressure also reached its maximum value of 5.27×104 Pa; The proportion of cavitation in the reactor reached 19.34%, which is the highest among the five different distribution modes. [Conclusion] The distribution of transducers has a significant impact on the cavitation intensity inside the ultrasonic reactor. Through numerical simulation analysis methods, different transducer distributions can be optimized to determine the optimal transducer distribution.

Keywords: ultrasonic reactor; ultrasonic transducer; numerical simulation; sound pressure distributio

 

引文信息:[1]蒋越,吴璇,王浩博,等.双超声波换能器分布方式对反应器内声场影响的数值模拟[J].南方农机,2023,54(23):18-21.

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