流体机械

2021, v.49;No.594(12) 78-85+94

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往复压缩机管路系统气固耦合振动特性研究
Study on gas-solid coupling vibration characteristics of reciprocating compressor pipeline system

赵杰,姚冉,王雯昕,周晶,王博阳
ZHAO Jie,YAO Ran,WANG Wenxin,ZHOU Jing,WANG Boyang

摘要(Abstract):

基于瞬时动力学和流体力学理论,采用双向流固耦合数值模拟计算方法,对往复压缩机管路进行气固耦合分析、模态分析和谐响应分析,预测气固耦合和非耦合作用下管路振动响应,并与试验台测量获得的振动响应数据进行对比。研究结果表明:该机组振动超标的原因是在2阶9倍频下发生共振,考虑气固耦合作用下的管路振动响应预测相对精确(耦合作用误差率为9.8%,非耦合作用的误差率为52.5%),试验与仿真结果的比对也进一步验证了用仿真手段研究和预测气固耦合作用下往复压缩机管路振动特性分析的正确性。进而预测考虑耦合作用下高压和超高压工况对管道固有频率的影响,预测结果表明:当气体压力在0.6~195 MPa之间,管道的固有频率基本不会随着工况的改变而改变,为固有频率的平稳区,在195~300 MPa之间时管道的固有频率进入上升区,研究结果为往复压缩机管路系统振动特性研究中是否需要考虑流固耦合作用提供参考。
Based on the instantaneous dynamics and hydromechanics theory and using the reciprocating compressor pipeline as the research object,the two-way gas-solid coupling numerical simulation method was used to conduct gas-solid coupling analysis,modal analysis and harmonic response analysis.The simulation results were used to predict the vibration response of the pipeline under gas-solid coupling and uncoupling conditions,and compared with the vibration response data obtained from the experimental bench. The research results show that the overstandard vibration of the unit is due to resonance at 2 nd order 9 th octave. The prediction of the vibration response of the pipeline considering gas-solid coupling was relatively accurate(the error rate of coupling effect was 9.8%,while the error rate of uncoupling effect was 52.5%).The comparison between the experimental results and simulation results also further validated the correctness of using simulation means to study and predict the vibration characteristics of reciprocating compressor pipelines under the action of gas-solid coupling.Furthermore,the influence of high pressure and ultrahigh pressure operating conditions on inherent frequency of the pipeline under the coupling action.The prediction results show that when the gas pressure was 0.6~195 MPa,the inherent frequency of the pipeline basically does not change with the change of working conditions,which is the stable zone of inherent frequency.When the gas pressure was between 195 and 300 MPa,the inherent frequency of the pipeline enters the rising region.The simulation results provide a reference for whether fluid-structure coupling needs to be considered in the study of the vibration characteristics of reciprocating compressor piping system.

关键词(KeyWords): 管道振动;双向气固耦合;数值模拟;固有频率
pipeline vibration;two-way gas-solid coupling;numerical simulation;inherent frequency

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2016YFE0204200);; 北京市大学生科研训练项目(2020X00242)

作者(Author): 赵杰,姚冉,王雯昕,周晶,王博阳
ZHAO Jie,YAO Ran,WANG Wenxin,ZHOU Jing,WANG Boyang

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