Numerical Modelling and Experimental Validation of Twin-Screw Expanders
Numerical Modelling and Experimental Validation of Twin-Screw Expanders
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DOI：
10.3390/en13184700
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发表时间：
2020-09
期刊：
影响因子：
3.2
通讯作者：
K. Vimalakanthan;M. Read;A. Kovacevic
中科院分区：
文献类型：
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作者：
K. Vimalakanthan;M. Read;A. Kovacevic
正排量机器已被确定为用于小规模发电系统（例如有机朗肯循环（ORC））的适当膨胀器。螺杆膨胀机可以在干燥和两相条件下的工作流体中以良好的效率运行。需要对流体膨胀过程有详细的了解，以优化特定应用的机器设计和操作，因此精确的设计工具至关重要。利用空气膨胀的实验数据，CFD和腔室模型已被应用于研究端口流动和泄漏对膨胀过程的影响。这两种模型都显示出预测压力变化和功率输出具有良好的精度。验证室模型，然后用于确定实验条件下的最佳体积比和转速。
Positive displacement machines have been identified as appropriate expanders for small-scale power generation systems such as Organic Rankine Cycles (ORCs). Screw expanders can operate with good efficiency in working fluids under both dry and two-phase conditions. Detailed understanding of the fluid expansion process is required to optimise the machine design and operation for specific applications, and accurate design tools are therefore essential. Using experimental data for air expansion, both CFD and chamber models have been applied to investigate the influence of port flow and leakage on the expansion process. Both models are shown to predict pressure variation and power output with good accuracy. The validated chamber model is then used to identify the optimal volume ratio and rotational speed for experimental conditions.