摘要
为了研究核主泵所受径向力,基于RNG k-ε模型分别对原型核主泵和重心偏移后的核主泵进行数值模拟.通过模拟分别获得了原型泵和不同偏心距下核主泵外特性、中心截面的静压分布及作用在蜗壳和叶轮上的径向力特性,并将其与理论值进行对比分析.研究结果表明:对比试验与数值计算外特性曲线趋势一致,说明所建立的核主泵径向力计算模型具有一定的准确性;4种方案下叶轮与导叶内部的静压区别不大,而蜗壳内部的静压变化较明显,各偏心距下的静压呈非对称分布,偏心距的变化对核主泵的内外特性具有一定的影响;核主泵在设计点运行时径向力最小但不为零,偏心10 mm左右时所受径向力最小;通过对比不同偏心距下径向力数值预测值和Stepanoff理论公式计算值可知,不同偏心距所受径向力与理论公式值变化趋势一致,说明数值模拟的方法验证了用经验公式计算径向力的准确性.
In order to study the radial force of nuclear main pumps, two pumps, one is a prototype pump and the other one is with gravity center offset, were investigated numerically by CFD technology based on the RNG k -ε model. The nuclear main pumps＇performance, distribution of static pressure at the center section and the characteristics of radial force acting on the volute and impeller were calculated and were compared with the theoretical results. It is showed that the test results and numerical calculation are in good agreement, thus the numerical calculation of radial force calculation model for nuclear main pump has certain accuracy, h makes no great difference in distribution of static pressure within four schemes in the impeller and guide vane, but that in the volute varies obviously. The static pressure distributions under various eccentricities were asymmetric, and the change of eccentricities had a certain influence on the internal and external performances of the nuclear main pumps. The radial force of nuclear main pump was minimum when it operated at the design point, but not equal to zero,the radial force was optimum when the eccentricity is 10 mm. By comparing the predicted radial force and the Stepanoff theoretical ones under various eccentricities it could be known that, the curves trend of the radial force under various eccentricities were consistent with the theoretical ones and the method of the numerical simulation verified the accuracy of the radial force calculated by the empirical formula.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2015年第6期461-466,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
"十二五"国家科技支撑计划项目(2011BAF14B04)
江苏省自然科学基金资助项目(BK20130516)
江苏高校优势学科建设工程资助项目
关键词
核主泵
径向力
偏心距
数值模拟
nuclear main pump
radial force
eccentricity
numerical simulation
