| 摘要:使用低温空气作为试验介质，对低温两相甲烷透平膨胀机进行性能测试。在模化计算阶段，以比转速作为第一相似准则数，结合比直径、马赫数和雷诺数，对甲烷膨胀机进行空气模化计算，结合特性比完成了两相透平和纯气相透平的性能换算。根据模化计算结果绘制膨胀机特性曲线，通过与甲烷工况下的膨胀机特性曲线对比，发现二者变化规律相同且等熵效率的误差在3%以内。以模化计算结果作为试验工况进行空气试验，在试验中透平膨胀机实现长时间稳定运行，等熵效率达到71%，且试验结果与模化计算得出的膨胀机特性曲线相吻合。 |
| 关键词: 透平膨胀机 相似模化 相变 变工质 |
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| Cryogenic Two-Phase Turbine Air Modeling Experiment |
| Xie Shenrui,Diao Anna,Yang Xiaoqiang,Yuan Longjian |
| Shanghai Marine Diesel Engine Research Institute， Shanghai 201108， China |
| Abstract:Using low-temperature air as the experiment medium，performance experiments were conducted on a cryogenic two-phase methane turbo-expander.In the modeling calculation phase，specific speed was adopted as the primary similarity criterion，air modeling calculations were performed in combination with specific diameter，Mach number and Reynolds number，and the performance conversion between two-phase turbines and pure gas-phase turbines was completed in combination with characteristic ratio.Based on the modeling calculation results，the performance characteristic curves of the expander were plotted.By comparing these with the characteristic curves under methane operating conditions，it was found that the variation trends of the two were consistent，and the error in isentropic efficiency was within 3%.Using the modeling calculation results as the test conditions，air experiments were carried out.During the experiments，the turbo-expander achieved long-term stable operation，with an isentropic efficiency reaching 71%.The experiment results were in good agreement with the performance characteristic curves obtained from the modeling calculations. |
| Key words: turbine expander similar modeling phase change working fluid variation |
