ORC向心透平的CFD计算与性能分析
Journal of Zhengzhou University(Engineering Science)（2022）
Abstract
为了预测设计的向心透平在设计工况和非设计工况下的性能,采用ANSYS CFX对向心透平进行了三维计算流体动力学(CFD)数值模拟,分析了透平进口温度、转速及压力比对其性能的影响,并通过实验数据对CFD模拟结果进行验证.结果表明:在设计工况下,CFD计算结果与一维设计参数非常吻合,两者等熵效率与输出功率的相对误差分别为0.36％和4.85％;在设计转速下,当进口温度为368 K时透平等熵效率达到最大,为77.6％;透平输出功率随进口温度的升高而增大,在0.9～1.1的转速比下运行时,透平等熵效率变化较小且具有较高的输出功率;压力比对透平等熵效率的影响较大,同时,透平在设计转速和进口温度下运行时能较好地处理压力比的变化;以压力比、等熵效率和温降为评价指标,将实验测量数据与CFD计算结果进行对比,其最大相对误差均小于10％,由此验证了CFD数值模拟对透平性能预测的可靠性.
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