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Numerical optimization for fluid flow in turboexpander wheel of helium liquefaction plant

机译：氦液化厂涡轮膨胀叶轮流体流量的数值优化

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A radial turbine is one or the vital components or a helium liquefaction plant. The design of a turbine becomes critical due to its compact size and high-speed configuration. In this study, numerical optimization has been performed for the three-dimensional steady flow of helium gas in the radial inflow turbine of a helium liquefaction plant at a nominal condition. The mean line design is an appropriate method to obtain the approximate results. The computational fluid dynamics simulation algorithm is adopted in this study to reach the final results and Ansys CFX is used for the simulation. From the analysis, it has been reported that the number of rotor blades was overestimated in the mean line design. Performance parameters like total-to-static efficiency and velocity ratio were also found to be optimum numerically under a preliminary design condition. Finally, power of 1.7 kW was achieved at total-to-static efficiency of 71.4%. The deviation in analytical and numerical results is within ±10% for performance as well as geometric parameters.
机译：径向涡轮机是一种或重要组分或氦液化厂。由于其紧凑的尺寸和高速配置，涡轮机的设计变得至关重要。在该研究中，在氦气液化厂的径向流入涡轮机中以标称条件执行了数值优化。平均线设计是获得近似结果的适当方法。本研究采用计算流体动力学仿真算法，以达到最终结果，并且ANSYS CFX用于模拟。从分析中，据报道，转子叶片的数量在平均线设计中高估。在初步设计条件下，还发现具有总到静态效率和速度比等的性能参数。最后，以71.4％的总静态效率实现1.7 kW的功率。分析和数值结果的偏差在性能以及几何参数范围内以±10％。

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