蜗壳进口截面对液力透平径向力的影响  

Impact of volute inlet cross-section on the hydraulic turbine radial force

作　　者：杨军虎[1] 李吉成[1] 

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

出　　处：《西华大学学报（自然科学版）》2015年第5期34-38,共5页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(51169010)

摘　　要：借助ANSYS-FLUENT软件，通过对一单级液力透平的蜗壳进行再设计，对液力透平在不同蜗壳进口截面情况下的径向力特性进行研究，并分析透平性能的变化情况。结果表明：透平径向力随蜗壳进口截面直径的增大而呈线性增大，当蜗壳进口截面直径大于一临界值时，径向力又缓慢下降；径向力合力的方向与隔舌的相对位置在小流量时为60°～90°，在大流量时为110°～150°；隔舌区域的流动对径向力的分布有较强的影响，经过蜗壳再设计后透平的效率要高于原透平的效率。Radial force is one of the important factors affecting the operation stability of the hydraulic turbine. Alternating radial force loading on the hydraulic turbine shaft successively can induce a certain deflection,and other problems like vibration. The volute parameters are closely related to the radial force performance of the hydraulic turbine. In this paper,the volute of a single- stage hydraulic turbine was redesigned,and the ANSYS- FLUENT software was used to study the radial force performance of the hydraulic turbine of different volute inlet cross- sections. And also the changes of the turbine performance were analyzed. The results show that the radial force increases linearly with the increase of the volute inlet cross- section diameter. When the volute inlet cross- section diameter is greater than a critical value,there is a slow decline of the radial force. The relative position between the tongue and the resultant radial force direction is between 60° ~ 90° at a low flow rate,and about 110° ~ 150° at a high flow rate. The flow across the tongue region has a strong influence on the distribution of the radial force. Furthermore,the turbine efficiency with the redesign of the volute is higher than that of the original one.

关 键 词：液力透平 径向力 蜗壳截面 数值计算 

分 类 号：TH311[机械工程—机械制造及自动化]