ORC向心透平的CFD计算与性能分析  

CFD Calculation and Performance Analysis of ORC Radial Inflow Turbine

作　　者：马新灵[1] 张景迪 孟祥睿[1] 王聪[1] 潘佳浩 邱宇恒 MA Xinling;ZHANG Jingdi;MENG Xiangrui;WANG Cong;PAN Jiahao;QIU Yuheng(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2022年第5期46-51,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省高等学校重点科研项目(19A480005)。

摘　　要：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。In order to predict the performance of the designed radial inflow turbine in design and off-design conditions,the three-dimensional computational fluid dynamics(CFD)simulation of radial inflow turbine was carried out by ANSYS CFX.The effects of turbine inlet temperature,rotational speed and pressure ratio on its performance were analyzed,and the CFD simulation results were verified by experimental data.The results showed that under the design condition,the CFD calculation results were very consistent with the one-dimensional design parameters,and the relative errors of isentropic efficiency and output power were 0.36%and 4.85%,respectively.Under the design rotational speed,the isentropic efficiency reached maximum 77.6%with the inlet temperature was 368 K.The output power increased with the increase of inlet temperature,the isentropic efficiency had a slight change and had high output power when the turbine was operating at 0.9 to 1.1 of the rotational speed ratio.The pressure ratio had a great influence on the isentropic efficiency of the turbine.Meanwhile,the turbine could better deal with the change of pressure ratio when operating at the design rotational speed and design inlet temperature.Taking the pressure ratio,isentropic efficiency and temperature drop as evaluation indexes,the experimental data were compared with the CFD calculation results.The results showed that the maximum relative errors were less than 10%,which could verify the reliability of CFD numerical simulation for turbine performance prediction.

关 键 词：向心透平 三维数值模拟 等熵效率 输出功率 

分 类 号：N032[自然科学总论—科学技术哲学] TK14[动力工程及工程热物理—热能工程]