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:燕浩[1] 柴立平[1] 李跃[1] 李强[1] 石海峡[1]
机构地区:[1]合肥工业大学化工机械研究所,安徽合肥230009
出 处:《排灌机械工程学报》2016年第8期679-685,共7页Journal of Drainage and Irrigation Machinery Engineering
基 金:国家自然科学基金资助项目(51409197);合肥工业大学博士学位人员专项基金资助项目(JZ2015HGBZ0469;JZ2015HGBZ0128)
摘 要:为了研究大型排水泵装置空化区间,基于SST k-ω湍流模型,应用Rayleigh-Plesset模型对泵装置内部空化进行描述,结合模型泵试验验证数值模拟结果准确性.重点分析了泵装置相同水位不同流量系数δ下的空化分布规律、空化体积分数以及大流量系数下叶片表面受力分布规律.结果表明:设计水位下,δ≥0.8和δ=1.0时泵装置叶轮非空化运行角度分别为-8°~0°和-8°^+6°;与设计水位相比,泵装置进水池水位降低会增大空化区间,反之将会减小;相同流量系数下,叶轮运行角度偏离0°越大,空化现象越严重,空化体积分数越大;进口水位达到最高防洪水位,非空化区间的最大运行工况为Q=28.75 m3/s;大流量系数下运行时,叶轮表面总压分布随着叶轮运行角度的增大而增大.研究结果为大型排水泵装置稳定运行提供参考.To study the cavitation range of large-scale drainage pumps system,based on SST k-ω turbulence model,the pumps internal cavitation was described by using the Rayleigh-Plesset model,combined with the model pump experiment to verify the numerical results. Also,the emphasis was put on the distribution of cavitation,cavitation volume fraction under the same inlet water level and different flow coefficients,and blades surface pressure distribution under the large flow conditions. The results show that under the optimal conditions,when the flow coefficients( δ) are 0. 8 and 1. 0,blades angles of the non-cavitation ranges are-8°-0° and-8°-+ 6°; the cavitation range rapidly expands for lowering the inlet water level; on the contrary,the range will decrease. However,under the larger flow conditions,the more the blades angle deviation from 0° is,the more serious the cavitation phenomenon is,the greater the volume fractions are. Moreover,when the water level is up to the highest flood control water level,the biggest operation flow is 28. 75 m3/ s in non-cavitation conditions; and the blades surface pressure distribution will increase as the blades running angle enlarges under the large flow conditions. The results provide a reference for the stable operation of the large-scale drainage pumps system.
关 键 词:大型排水泵装置 轴流泵 数值模拟 空化 运行水位
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:216.73.216.222