| 基于平衡冷凝模型的超临界CO2压缩机内部冷凝数值分析 |
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| 引用本文： | 陈来杰,卢川,沈昕,易经纬,李洋,欧阳华,杜朝辉. 基于平衡冷凝模型的超临界CO2压缩机内部冷凝数值分析[J]. 核动力工程, 2022, 43(3): 165-172. DOI: 10.13832/j.jnpe.2022.03.0165 |
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| 作者姓名： | 陈来杰 卢川 沈昕 易经纬 李洋 欧阳华 杜朝辉 |
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| 作者单位： | 1.上海交通大学机械与动力工程学院，上海，200240 |
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| 摘 要： | 超临界二氧化碳（sCO2）布雷顿循环是第四代核反应堆能量转换系统主要解决方案之一，实际运行中，压缩机内sCO2可能发生凝结，导致效率降低，运行稳定性受到影响。本文结合Span-Wagner物性模型，建立了sCO2的平衡冷凝数值模型，对sCO2压缩机进行数值模拟，分析了sCO2冷凝的主要区域、成因及影响。结果表明，sCO2的凝结主要受流速影响，发生于压缩机主叶片前缘吸力面的50%叶高以上区域及前缘间隙内近压力面区域，前一区域由sCO2的局部加速所致，后一区域由叶顶间隙泄漏所致；在给定工况下，冷凝区域很小，未扩展到整个通道，冷凝的sCO2很少，未形成两相流，对压缩机运行的影响很小。
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| 关 键 词： | 超临界二氧化碳（sCO2） 离心压缩机 数值计算 冷凝 |
| 收稿时间： | 2021-05-06 |
Numerical Simulation of Condensation in Supercritical CO2 Compressor Based on Equilibrium Condensation Model |
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| Affiliation: | 1.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China2.Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China |
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| Abstract: | Supercritical carbon dioxide (sCO2) Brayton cycle is one of the main solutions of the Generation IV nuclear reactor energy conversion system. During the actual operation, sCO2 in the compressor may condense. As a result, the efficiency is reduced and the operation stability is affected. In this paper, the equilibrium condensation numerical model of sCO2 was established with the Span-Wagner model, and the numerical simulation of the sCO2 compressor was carried out. The main condensation regions, causes and influences of the condensation of sCO2 were analyzed. The results show that the condensation of SCO2 is mainly affected by the flow velocity. The condensation of sCO2 occurs in the area above 50% blade height on the suction surface of the leading edge of the main blade and near the pressure surface in the leading edge gap. The former area is caused by local acceleration of sCO2, and the latter area is caused by tip clearance leakage; Under the given working condition, the condensation area is very small, which does not extend to the whole channel, the condensed sCO2 is very little, and no two-phase flow is formed, which has little influence on the operation of the compressor. |
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