检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:黄祺[1] 刘在伦[1] 权辉[1] 李琪飞[1] 郭广强[1] 王小兵 HUANG Qi;LIU Zailun;QUAN Hui;LI Qifei;GUO Guangqiang;WANG Xiaobing(School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)
机构地区:[1]兰州理工大学能源与动力工程学院,兰州730050
出 处:《农业机械学报》2020年第9期127-134,共8页Transactions of the Chinese Society for Agricultural Machinery
基 金:国家自然科学基金项目(51969014)。
摘 要:旋喷泵内部压力提升是叶轮与旋壳共同作用的结果,一直以来泵腔内部压力根据叶轮出口压力确定,忽略了旋壳的圆筒效应,导致泵腔压力计算不够准确。为解决这一问题,基于旋壳圆筒效应建立旋喷泵内部压力数学模型,引入液体旋转系数,应用试验与数值计算相结合的方法对液体旋转系数进行了分析验证,并对液体旋转系数的影响因素进行了敏感性分析。结果表明:可以建立旋喷泵内部压力数学模型,通过理论计算内部压力分布,旋喷泵内部压力计算需考虑旋壳效应;试验泵液体旋转系数为0.75,在该系数下泵腔内部压力理论值与试验值吻合度较高;以一复式叶轮旋喷泵为实例,验证了该旋喷泵内部压力数学模型的可靠性。液体旋转系数影响因素敏感性分析表明:壁面粗糙度、转速、流量对液体旋转系数影响较小,试验范围内液体旋转系数介于0.736~0.764之间,波动较小,不超过3%,可以认为是定值。本研究结果可为旋喷泵内部压力理论计算及集流管安装高度选取提供参考。As a small flow,high head and low specific speed pumps,roto-jet pumps are widely used in the liquid delivery and it has very simple construction and smooth performance curve and cheap maintainment.The pressure in the chamber increase is the result of impeller and rotating shell.It has been determined according to the impeller but ignoring cylinder effect of the rotating shell for a long time which makes the calculation of pump cavity pressure inaccurate.In order to solve this problem,a mathematical model of the roto-jet pump internal pressure was established based on cylinder effect of the rotating shell and the liquid rotation coefficient was introduced.Combining experiment with numerical calculation the liquid rotation coefficient was verified and the influencing factors were subjected to sensitivity analysis.The results showed that a mathematical model can be established to calculate the internal pressure distribution of the roto-jet pump in a theoretical way.Effect of rotating shell must be taken into account of the internal pressure.The liquid rotation coefficient of the test pump was 0.75 and the theoretical pressure value at this coefficient was in good agreement with the test value.The mathematical model was verified by an example of a double-type impeller roto-jet pump.Sensitivity analysis of factors affecting showed that the wall roughness,rotation speed and flow had a weak effect on the liquid rotation coefficient.The rotation coefficient was between 0.736 and 0.764 in the test range and the fluctuation was small,which value not exceeding 3%was considered as a fixed.Tests showed that the larger the radius of the pump chamber was,the more obvious the pressure increase caused by the shell effect was,the research results can provide an important basis for internal pressure theoretical calculation of the roto-jet pump,the design of collecting pipe and the selection of installation height of collecting pipe.
分 类 号:TH311[机械工程—机械制造及自动化]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:3.144.216.188