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气泡泵是单压吸收式制冷系统的关键部件之一,其内部工质的流动模拟是气泡泵设计的主要因素,然而在理论计算过程中,存在着两相流模型适用范围有限而模拟精度要求高这一矛盾,因此有必要根据气泡泵特性对现有两相流模型进行适用性评价。本文建立了气泡泵稳态压力降模型,分别对3种均相流压降模型和15种分相流压降模型组合(3种分相流摩阻压降模型分别与5种截面含气率模型组合)进行了模拟计算,并结合饱和水工质下的气泡泵实验数据,将理论值与实验值对比得出误差值进行模型评价。结果表明:Friedel摩阻压降模型结合Zuber截面含气率模型的分相流压降模型的模拟精度最高,适用性最好;均相流压降模型次之,但其计算稳定性最好。
Bubble pump is one of the key components of the single-pressure absorption refrigeration system. The flow simulation of the internal working fluid is the main factor in the design of the bubble pump. However, in the theoretical calculation process, the limited applicability of the two-phase flow model and the simulation accuracy Therefore, it is necessary to appraise the applicability of the existing two-phase flow model according to the bubble pump characteristics. In this paper, steady-state pressure drop model of bubble pump was established. The three kinds of homogeneous flow pressure drop model and 15 kinds of phase flow pressure drop model were combined respectively (three kinds of phase-split flow frictional pressure drop model and five kinds of gas flow rate Model combination) were simulated. Based on the experimental data of bubble pump under saturated water working medium, the error value was compared with the theoretical value and the experimental value to evaluate the model. The results show that the Friedel frictional pressure drop model combined with the Zuber gas holdup model has the highest simulation accuracy and the best applicability. The homogeneous flow pressure drop model is second, but the calculation stability is the best.