基于动网格技术的串并联囊式压力脉动衰减器的特性研究

针对无法定量分析计算囊式衰减器衰减效果的问题,以某囊式衰减器为研究对象,运用动网格技术结合用户自定义函数(UDF)对串联和并联式衰减器进行数值计算。克服了有限元流体计算中的发散问题和动网格更新过程中的负体积问题,在不同的脉动频率下,对囊式衰减器进行动态模拟,结果表明,串联式衰减器对压力脉动的衰减效果优于并联式;流体脉动频率与衰减器固有频率一致时衰减效果最好,最佳衰减率可达85%以上。仿真结果与实验结果基本吻合,验证了仿真模型的有效性和实用性,为提高囊式衰减器的衰减性能,也为变边界问题的分析研究提供了新的方法和思路。

Characteristics of series-parallel cystic pressure pulsation attenuator based on dynamic mesh technology

To solve the problem of attenuation effect of a cystic pressure pulsation attenuator being not able to be quantitatively computed and analyzed,a certain cystic pressure pulsation attenuator was taken as the research object,and the dynamic mesh technology was combined with the user-defined-function(UDF)to do numerical calculation for series and parallel attenuators,solve the divergence problem in finite-element fluid calculation and the negative volume problem in dynamic mesh updating process,and dynamically simulate cystic pressure pulsation attenuators under different fluctuating frequencies.The results showed that the attenuation effect of series attenuator is better than that of parallel attenuator;when fluid pulsation frequency is consistent with the attenuator’s natural frequency,the attenuation effect is the best,and the best attenuation rate can reach more than 85%;the simulation results are basically consistent with test results to verify the effectiveness and practicability of the simulation model;the study results provide a new method and idea for analysis and research of variable boundary problem to improve the attenuation performance of cystic attenuators.