摘要
提出在往复压缩机阀腔处安装亥姆赫兹共鸣器,来消减阀腔及管路中气流脉动的措施,并应用平面波动理论及转移矩阵方法,数值模拟了亥姆赫兹共鸣器的衰减特性,对安装亥姆赫兹共鸣器前后的脉动进行了比较。设计了实验装置,在实验室两级压缩的橇装往复压缩机一级排气管路上对数值模拟结果进行了验证。研究结果表明:亥姆赫兹共鸣器能够有效衰减阀腔及管路内的脉动压力,可将阀腔内的脉动压力衰减40.1%,且下游管路内脉动压力也可得到有效衰减,最高衰减幅度达33.3%。研究还发现亥姆赫兹共鸣器的脉动衰减作用具有很强的频率选择特性,且安装于主管路的不同共鸣器共振频率互不干扰,在阀腔安装2个共鸣器能够同时有效衰减2、4倍频的压力脉动,而对其它频率脉动不产生影响。
Mounting a Helmholtz resonator nearby the valve chamber of a reciprocating compressor was suggested to attenuate the gas pulsation in the valve chamber as well as the pipeline downstream. Its attenuation characteristics was simulated with the plane wave theory together with transfer matrix method, and the damping effect was checked by comparing the pressure pulsation levels before and after mounting the resonator. The numerical simulation results show that Helmhohz resonator was effective in attenuating the gas pulsa- tion in the valve chamber and piping downstream, and the pulsation level was decreased by 40.1% in the valve chamber and 33.3% at maximum in the piping downstream. The damping effect of resonator was sensitive to its resonant frequency, and various resonators working simultaneously didn＇t interference each other. When two resonators were mounted in parallel, with resonant frequencies equal to the second and fourth harmonic frequencies, the pressure pulsation components corresponding to the resonant frequencies were re- markably decreased at the same time, while the pulsation levels at other harmonic frequencies almost kept unchanged.
出处
《压缩机技术》
2017年第2期9-13,共5页
Compressor Technology
关键词
亥姆赫兹共鸣器
气流脉动
往复压缩机
气柱固有频率
Helmholtz resonator
gas pulsation
reciprocating compressor
gas column natural frequency
