泵反转液力透平转速特性研究  

Study on Speed Characteristics of Pump Reverse Hydraulic Turbine

作　　者：王晓晖[1] 张兴杰 王庆方 蒋虎忠 杨浩 WANG Xiao-hui;ZHANG Xing-jie;WANG Qing-fang;JIANG Hu-zhong;YANG Hao(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Ebara Machinery Zibo Co.,Ltd.,Zibo 255086,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]荏原机械淄博有限公司,山东淄博255086

出　　处：《液压气动与密封》2024年第4期67-72,共6页Hydraulics Pneumatics & Seals

基　　金：中国博士后科学基金(2022M712676);甘肃省优秀研究生“创新之星”项目(2022CXZX-443)。

摘　　要：为了研究液力透平的转速特性,采用Fluent软件动网格中的SDOF求解器对一台比转速为48的离心泵反转作液力透平进行数值模拟,分析了液力透平在启动过程中转速的变化规律。结果发现:随着转速的增大,透平高效区变宽,高效点明显向大流量偏移。流量越大,透平的飞逸转速就越大,各流量工况下的飞逸转速约为额定转速的1.4倍。在负载系数B_(g)为1.4905时,其负载力矩达到临界值,继续增加负载,叶轮不在工作,此时的水动力矩小于负载力矩。In order to study the speed characteristics of the hydraulic turbine,the SDOF solver in the dynamic mesh of Fluent software was used to numerically simulate a centrifugal pump with a specific speed of 48 as a hydraulic turbine,and the change rule of the speed of the hydraulic turbine during the start-up process was analyzed.The results show that with the increase of rotational speed,the high efficiency zone of turbine becomes wider,and the high efficiency point obviously shifts to large flow.The larger the flow rate,the greater the runaway speed of the turbine,and the runaway speed under each flow condition is about 1.4 times of the rated speed.For the research object,when the load coefficient B_(g)is 1.4905,the load torque reaches the critical value.If the load continues to increase,the impeller is not working,and the hydrodynamic torque is less than the load torque.

关 键 词：液力透平 转速 水力性能 启动过程 

分 类 号：TH137[机械工程—机械制造及自动化] TK734[交通运输工程—轮机工程]