小流量工况下背叶片对重型渣浆泵磨损的影响  

Influence of back blade on wear of heavy slurry pump under low flow condition

作　　者：彭光杰[1,2] 周国新 胡自强 周红 PENG Guangjie;ZHOU Guoxin;HU Ziqiang;ZHOU Hong(National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China;Hunan Special Pump Engineering Technology Research Center, Changsha, Hunan 410100, China;Jiangxi Naipu Mining Machinery and New Materials Co. Ltd., Shangrao, Jiangxi 334000, China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]湖南省特种泵工程技术研究中心,湖南长沙410100 [3]江西耐普矿机新材料股份有限公司,江西上饶334000

出　　处：《排灌机械工程学报》2020年第4期332-338,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏大学高级人才科研启动基金资助项目(12JDG097);江苏高校优势学科建设工程资助项目。

摘　　要：针对重型渣浆泵在偏离设计工况运转时出现的局部磨损情况进行了研究,应用Particle模型对重型渣浆泵高浓度浆体输送进行数值模拟,并通过试验验证,分析了节流设计的重型渣浆泵在小流量工况运转时,叶轮前后背叶片的设计对泵内部局部磨损的影响.研究结果表明:节流设计的渣浆泵在小流量工况下运行时,内部流场比设计工况下更加不稳定,扬程下降3%~10%;护套内部颗粒体积分数的分布受前后背叶片影响很小,但对颗粒滑移速度会产生明显影响;当设计有前后背叶片的重型渣浆泵在小流量工况下运行时,护套与转子交界靠近隔舌处固体颗粒的滑移速度激增,产生严重的局部磨损,严重影响使用寿命;通过去除前后背叶片,可以有效降低交界处的颗粒滑移速度,减轻磨损程度;但前背叶片的去除也会造成前腔回流量大幅增加,使前腔内部旋涡强度增大,加剧前护板内侧的磨损.Considering the wear caused by the application of heavy slurry pump operating under conditions deviating from design conditions,the Particle model was used to simulate the transport of high-concentration slurry in the heavy slurry pump and the experimental verification was carried out.The influence of the front and back blades of the impeller on the local wear of the heavy slurry pump with throttle design under the low flow condition was analyzed.The results show that the internal flow field of slurry pump with throttle design is more unstable than that of slurry pump under the low flow condition.The head drops by 3%-10%.The front and back blades have little effect on the particle volume fraction distribution inside the jacket,but have significant effects on particle slip velocity.When a heavy slurry pump with the front and back blades operates under low flow conditions,the slip velocity of solid particles at the interface between jacket and rotor near the tongue will increase sharply.It will cause serious local wear and seriously affect its service life.The removal of the front and back blades can effectively reduce the particle slip velocity at the interface to reduce wear.However,the removal of the front blades will also lead to backflow increase in the front cavity,which will increase the vortex intensity in the front cavity.As a result,the wear of the inner side of the front guard plate is aggravated.

关 键 词：离心式渣浆泵 固液两相流 磨损 前后背叶片 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]