基于CFD的船用离心泵口环磨损故障研究

发布时间：2018-03-17 08:20

本文选题：船用离心泵　切入点：口环磨损　出处：《华中科技大学学报(自然科学版)》2017年12期 　论文类型：期刊论文

【摘要】：为了研究发生口环磨损故障时船用泵的运行特性,以一台比转速为66.7的船用离心泵为研究对象,基于CFD研究了不同口环磨损情况下船用离心泵外特性、内部流场和叶轮表面径向力的变化规律.研究方案为前口环磨损(磨损量为f)、后口环磨损(磨损量为b)和前后口环同时磨损(磨损量为t)三种.结果表明:采用的数值模拟方法可靠;当口环磨损故障发生时,泵的扬程和效率均有所下降,磨损量f,b和t均为0.9mm时,泵扬程分别下降4.84%,1.07%和7.24%,效率分别下降11.74,6.51和16.25个百分点;前口环磨损对于泵性能的影响要大于后口环磨损,并且该模型泵对口环磨损量的敏感范围在0.0~0.6mm之间;三种方案的磨损量变化对泵内部静压影响顺序为tfb;口环磨损后,叶轮表面径向力减小,前后口环同时磨损时下降最大.研究结果可为船用离心泵故障监测及诊断提供依据.
[Abstract]:In order to study the operation characteristics of marine centrifugal pump when the wear failure of orifice ring occurs, taking a marine centrifugal pump with specific rotating speed of 66.7 as the research object, the external characteristics of marine centrifugal pump under different wear conditions of orifice ring are studied based on CFD. The variation of internal flow field and radial force on the surface of impeller. The results show that the wear of front ring (wear amount is fen), rear ring wear (wear amount is b) and front and rear ring wear (wear rate is t) are studied. The numerical simulation method is reliable. When the wear failure occurred, the head and efficiency of the pump decreased to a certain extent. When the wear quantity fnb and t were 0.9mm, the head of the pump decreased by 4.84% and 7.24%, respectively, and the efficiency decreased by 11.74% 6.51 and 16.25%, respectively. The effect of front ring wear on pump performance is greater than that of rear ring wear, and the sensitive range of wear volume of the pump is between 0.00 mm and 0.6 mm. The influence order of the three schemes on the static pressure of the pump is tfb; after the wear of the nozzle ring, the influence order is tfb, and the influence order of the wear on the internal static pressure of the pump is tfb. The radial force on the surface of the impeller decreases and the front and back ring wear down the maximum at the same time. The research results can provide the basis for fault monitoring and diagnosis of marine centrifugal pump.
【作者单位】：江苏大学流体机械工程技术研究中心;江苏大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51509109,51779106) 江苏省产学研联合创新基金资助项目(BY2015064-10) 江苏省“六大人才高峰”高层次人才项目(GBZB-017) 江苏省高校优势学科建设工程资助项目
【分类号】：TH311;U672

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