This paper presents a transient computational fluid dynamics (CFD) model of a reciprocating compressor to study the interaction of the thermodynamic process and pressure pulsation. To realize the interaction between the thermodynamics and the pressure pulsation, the most difficult procedure lies in dealing with the valve motion and flow through the valve channel both precisely and effectively. Therefore, a discretization method for the flow channel of the ring valve to generate structured grids is proposed. Then, the subsequent model is embedded in the flow channel of the compressor model. User-defined functions are employed to calculate the independent velocity of each valve plate based on the real-time pressure differences across the valve plates. After verified, the influences of the discharge pipeline configuration, pressure ratio, and rotational speed were examined. The results of the numerical model agreed well with the experiment. The maximal deviation between predictions and experiments at the pressure ratio of 3 was 6.14% of indicated power. The maximum deviation increased to 7.42% at the rotational speed of 480 rpm. The results for the discharge pipeline configuration verified that the buffer tank directly following the nozzle of the compressor contributed greatly to attenuating the pressure pulsation. A fast Fourier transform analysis of pressure pulsation showed that at all speeds, the amplitudes were almost the same below the eighth harmonic, and then gradually increased for the higher harmonics.

本文介绍了往复式压缩机的瞬态计算流体动力学（CFD）模型，以研究热力学过程与压力脉动的相互作用。为了实现热力学和压力脉动之间的相互作用，最困难的过程在于精确有效地处理阀的运动和通过阀通道的流量。因此，提出了一种用于环形阀的流道产生结构化网格的离散化方法。然后，将后续模型嵌入到压缩机模型的流道中。使用用户定义的函数可基于跨阀板的实时压力差来计算每个阀板的独立速度。经过验证后，对排放管路配置，压力比，和转速进行了检查。数值模型的结果与实验吻合得很好。压力比为3时，预测与实验之间的最大偏差为指示功率的6.14％。在480 rpm的转速下，最大偏差增加到7.42％。排放管道配置的结果证明，紧随压缩机喷嘴之后的缓冲罐在很大程度上削弱了压力脉动。对压力脉动的快速傅里叶变换分析表明，在所有速度下，振幅在八次谐波以下几乎都相同，然后对于较高的谐波逐渐增加。压力比为3时，预测与实验之间的最大偏差为指示功率的6.14％。在480 rpm的转速下，最大偏差增加到7.42％。排放管道配置的结果证明，紧随压缩机喷嘴之后的缓冲罐在很大程度上削弱了压力脉动。对压力脉动的快速傅里叶变换分析表明，在所有速度下，振幅在八次谐波以下几乎都相同，然后对于较高的谐波逐渐增加。压力比为3时，预测与实验之间的最大偏差为指示功率的6.14％。在480 rpm的转速下，最大偏差增加到7.42％。排放管道配置的结果证明，紧随压缩机喷嘴之后的缓冲罐在很大程度上削弱了压力脉动。对压力脉动的快速傅里叶变换分析表明，在所有速度下，振幅在八次谐波以下几乎都相同，然后对于较高的谐波逐渐增加。排放管道配置的结果证明，紧随压缩机喷嘴之后的缓冲罐在很大程度上削弱了压力脉动。对压力脉动的快速傅里叶变换分析表明，在所有速度下，振幅在八次谐波以下几乎都相同，然后对于较高的谐波逐渐增加。排放管道配置的结果证明，紧随压缩机喷嘴之后的缓冲罐在很大程度上削弱了压力脉动。对压力脉动的快速傅里叶变换分析表明，在所有速度下，振幅在八次谐波以下几乎都相同，然后对于较高的谐波逐渐增加。