An inverse mean-line design method for optimizing radial outflow two-phase turbines in geothermal systems
An inverse mean-line design method for optimizing radial outflow two-phase turbines in geothermal systems
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DOI：
10.1016/j.renene.2020.12.079
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发表时间：
2021-05
期刊：
影响因子：
8.7
通讯作者：
Hongyang Li;S. Rane;Zhibin Yu;Guopeng Yu
中科院分区：
文献类型：
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作者：
Hongyang Li;S. Rane;Zhibin Yu;Guopeng Yu
径向流出两相水轮机 (ROTPT) 是一种脉冲式两相水轮机，用于地热田等应用中的全流系统，以有效利用两相地流体能量。提出了一种一维非平衡逆平均线ROTPT设计方法。在规定的压力和叶片角度分布的情况下，沿流动方向导出旋转叶轮通道中的平均几何形状和流动参数，制定压力侧（PS）和吸力侧（SS）的压力分布，并在执行该算法时推导性能参数，包括扭矩、输出功率、效率等。通过使用设计方法，构建了地热系统的ROTPT。利用热相变模型在CFX中对ROTPT的流场进行了模拟，并得到了实验结果的验证。通过评估平均分布并检查三维流动，表明所提出的设计与 ROTPT 中的平均流动一致。同时，旋转通道存在三维效应，导致设计与CFD结果存在偏差。本文提供了一种用于设计 ROTPT 的非平衡求解器，而且还可以通过弯曲旋转通道中的相变来支持两相流的发展。
Radial outflow two-phase turbine (ROTPT) is an impulse two-phase turbine used for total flow systems in applications like geothermal fields to utilize the two-phase geofluid energy effectively. This paper presented a one-dimensional nonequilibrium inverse mean-line design method of ROTPT. With prescribed pressure and blade angle distributions, the averaged geometry and flow parameters in the rotating impeller channels were derived along the flow direction, the pressure distribution was formulated on the pressure side (PS) and the suction side (SS), and performance parameters were deduced in the implementation of the presented algorithm, including torque, output power, efficiency, etc. By using the design method, a ROTPT for a geothermal system was constructed. The flow field of the ROTPT was simulated in CFX using the thermal phase change model, which was validated by experimental results. By evaluating the averaged distribution and examining the three-dimensional flow, it was suggested that the presented design was consistent with the averaged flow in ROTPT. Meanwhile, there were three-dimensional effects in the rotating channel causing the deviation between the design and CFD results. This paper provides a nonequilibrium solver for designing ROTPTs but also can bolster the development of two-phase flow with the phase change in curved rotating channels.