Stepless capacity regulation through delayed closure of suction valves plays an important role in energy conservation for reciprocating compressors. Serious gas pulsation usually occurs with a suction valve unloader, and its analysis and suppression is a challenge owing to the varied components of the pulsation excitation under different conditions. In this study, a fast algorithm was proposed to calculate the gas pulsation of a compressor system with stepless capacity regulation and was further incorporated into the frequency-domain modeling of the gas pulsation. A test rig was constructed, and the model was experimentally verified. The dynamic pressure at positions in the suction and discharge valve chambers was measured, as the compressor capacity was varied by changing the closing time of the suction valves. The experimental data were compared with the simulated results and indicated a good agreement. The results showed that the suction valve unloader had a negative impact on the gas pulsation in the suction pipeline system. The pressure pulsation of the main excitation frequency increased in the suction pipeline system and decreased in the discharge pipeline, as the opening time of the suction valve increased.

中文翻译：

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计算无级容量调节往复式压缩机系统压力脉动的快速算法

通过延迟关闭吸入阀进行无级容量调节对于往复式压缩机的节能具有重要作用。吸入阀卸荷器通常会发生严重的气体脉动，由于不同条件下脉动激励的成分不同，对其分析和抑制是一个挑战。在这项研究中，提出了一种快速算法来计算具有无级容量调节的压缩机系统的气体脉动，并将其进一步纳入气体脉动的频域建模中。搭建了试验台，并对模型进行了实验验证。由于压缩机容量通过改变吸入阀的关闭时间而变化，因此测量了吸入阀室和排出阀室中各位置的动态压力。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 将实验数据与模拟结果进行了比较，表明了良好的一致性。结果表明，吸入阀卸荷器对吸入管道系统中的气体脉动有负面影响。随着吸入阀开启时间的增加，吸入管路系统主励磁频率的压力脉动增大，排出管路系统主励磁频率的压力脉动减小。