摘要
LUV型锅炉循环泵是一种为高温高压的循环水提供动力的设备,被广泛应用于火电、核电和余热回收等领域,其蜗壳为非轴向对称的环腔结构,导叶结构影响着蜗壳的内部流动和循环泵的水力性能。数值研究发现循环泵导叶和蜗壳内存在较多旋涡。针对上述问题,本文开展了导叶出口斜切角和半叶高导叶相对叶高对循环泵额定工况效率的影响研究,分析了导叶出口斜切角和半叶高导叶对循环泵水力性能和内部流动的影响。结果表明:随着导叶出口斜切角的增大,额定工况效率先增大后减小,最佳方案可提高0.7%,高效点向小流量工况偏移,导叶和蜗壳进口的旋涡减小,蜗壳进口主流区域增宽;随着半叶高导叶相对叶高的增大,额定工况的效率先增大后减小,最佳方案可提高2.9%,高效点向大流量工况偏移,导叶和蜗壳进口右侧的旋涡消失,蜗壳进口主流区域大幅增宽。
LUV type boiler circulating pump is a device that provides power for high-temperature and high-pressure circulating water.It is widely used in fields such as thermal power,nuclear power,and waste heat recovery.Its volute has a non axially symmetric ring cavity structure.The guide vane affect the inner flow of the volute and the hydraulic performance of the circulating pump.Numerical research has found that there are many vortices in the guide vane and volute of circulating pump.In response to the above issues,this article conducted a study on the influence of the guide vane outlet oblique cutting angle and the relative blade height of the half blade height guide vane on the rated condition efficiency of the circulating pump.The influence of the guide vane outlet oblique cutting and the half blade height guide vane on the hydraulic performance and the flow characteristic of the circulating pump were analyzed.The results show that the rated condition efficiency increases and then decreases with the increase of the outlet oblique cutting angle.The best efficiency has increased by 0.7%.The high efficiency points shifts towards small flow rate conditions.The vortices in the guide vane and volute inlet decreases.The main flow area of the volute inlet widens.With the relative blade height of the half blade height guide vane increases,the rated condition efficiency first increases and then decreases.The efficiency has increased by 2.9% as the best result.The high efficiency points shifts towards big flow rate conditions.The vortex in the guide vane and on the right side of the volute disappears.The main flow area at the volute inlet significantly widens.
作者
裴林
李国君
Lin Pei;Guo-jun Li(Xi'an Jiaotong University;Shengu Group Co.,Ltd.)
出处
《风机技术》
2025年第1期31-38,共8页
Chinese Journal of Turbomachinery
关键词
锅炉循环泵
离心泵
数值模拟
流动分析
导叶出口斜切
半叶高导叶
Boiler Circulating Pump
Centrifugal Pump
Numerical Simulation
Flow Analysis
Vane Diffuser Outlet Oblique Cutting
Half Blade Height Vane Diffuser
