摘要
强制循环泵是催化裂化装置烟气热量回收系统中重要的水循环动力设备,蜗壳为半球形结构带导叶的LUV型泵是一种广泛应用的强制循环泵,其导叶结构对泵的性能有着至关重要的影响。本文针对强制循环泵二元导叶在不同叶高处的进口叶片安装角与水流角不匹配的问题,发展了采用后盖板和前盖板的叶片中弧线角度分布和叶片厚度分布来构建叶型的三元导叶叶片结构设计方法,并数值研究了导叶后盖板和前盖板处进出口叶片安装角对泵额定工况效率和内部流动特性的影响。结果表明:随着前后盖板叶片进出口安装角中一个变量的增大,额定流量点效率均先增大后减小;设计的三元导叶方案比二元导叶方案在额定工况下的效率提高了0.9%;后盖板附近的叶片安装角与水流角的匹配性对泵的效率起到了更加重要的作用;三元导叶方案在后盖板附近0.1叶高截面上进口水流角与叶片安装角的匹配关系得到改善,此截面上的旋涡区减少,导叶内的能量耗散减小。
The forced circulation pump is the important equipment that provides water circulation power in the flue gas heat recovery system of catalytic cracking unit.The LUV pump with a guide vane and a hemispherical volute structure is a kind of the widely used forced circulation pumps.The structure of guide vane has a crucial impact on the performance of the pump.This article aiming on the problem that the flow angle and inlet blade angle of the binary guide vane at different blade height sections cannot be fully matched,develops a ternary guide vane design method that use the distribution of blade mean camber line angles and blade thickness at hub and shroud to construct the blade profile.By numerical methods studied the effect of the inlet and outlet blade installed angle at hub and shroud on the rated operating efficiency and internal flow characteristics.The results show that with one variate of the inlet and outlet blade angle at hub and shroud increases,the rated flow rate point efficiency increases and then decreases.The designed ternary guide vane scheme improves rated operating conditions efficiency by 0.9%than the binary guide vane scheme.The matching of the blade angle and the flow angle near hub plays a more important role in pump efficiency.The matching between the inlet flow angle and the blade installed angle on the 0.1 blade height section near hub has been improved in the ternary guide vane scheme.The vortex area on this section is reduced,and the energy dissipation inside the guide vane is reduced.
作者
裴林
李国君
张建茹
Lin Pei;Guo-jun Li;Jian-ru Zhang(Xi'an Jiaotong University;Shengu Group Co.,Ltd.)
出处
《风机技术》
2024年第2期31-37,共7页
Chinese Journal of Turbomachinery
关键词
强制循环泵
离心泵
数值模拟
导叶设计
导叶进出口角
流动分析
Forced Circulation Pump
Centrifugal Pump
Numerical Simulation
Design of Guide Vane
Inlet and Outlet Angles of Guide Vane
Flow Analysis
