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S-CO2向心透平CFD数值模拟方法研究
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Abstract:
针对超临界二氧化碳向心透平CFD数值模拟方法进行研究，基于自主设计的10 MW级S-CO2向心透平，分别选取单流道和全周流道作为计算域进行模拟，结果表明，单流道计算域与设计值和全周流道计算结果的误差均在3%以内，从而验证了采用单流道对S-CO2向心透平进行模拟的准确性和可靠性。并针对S-CO2特殊物性，分别采用R-K方程、P-R方程、真实气体性质表(RGPT)进行计算，结果表明，三种不同真实气体性质计算方法在对透平的流量、功率、效率评估方面具有一定的准确性，与设计值误差均在3%以内，但是采用R-K方程和P-R方程计算时，透平的焓值和熵值与实际气体误差较大，采用外部生成真实气体性质表的方法更为准确。
The CFD numerical simulation method for supercritical carbon dioxide centripetal turbine was studied. Based on the self-designed 10 MW S-CO2 centripetal turbine, a single flow channel and a full-circle flow channel were selected as the calculation domain for simulation. The results showed that the error between the calculation domain of a single flow channel and the design value and the calculation result of a full-circle flow channel were both within 3%. Thus, the accuracy and reliabil-ity of simulating S-CO2 centripetal turbine with a single flow channel can be verified. In view of the difficulties brought by the special physical properties of S-CO2 to the numerical simulation results, the R-K equation, P-R equation and real gas Property table (RGPT) are used to calculate, and the results show that the three different calculation methods of real gas properties have a certain accu-racy in the evaluation of flow, power and efficiency of the turbine, and the error between them and the design value is less than 3%. However, when the R-K equation and P-R equation are used to calculate, the enthalpy and entropy of the turbine have a large error with the actual gas, and the method of generating the real gas properties table externally is more accurate.
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