摘要
通过试验和数值计算研究了一台双吸泵的空化性能。为得到更为精确的模拟结果,在进行数值计算之前,分别对湍流模型和空化模型进行了改进,并通过二次开发技术把改进后的模型添加到CFX中。把非空化与空化状态下的模拟结果与试验结果进行了详细的对比,对比结果表明数值计算能够较好地预测双吸泵的能量特性及空化特性。此外,为较为全面地研究该双吸泵内的空化流场,不仅分析了叶轮内空泡体积分数分布和吸水室内空泡分布,还对泵体沿吸水室隔舌中间断面静压分布和叶轮流道内总压分布进行了仔细的研究。研究结果明确了泵性能下降的主要原因是空化的发展,且数值计算能够较为真实地反映双吸泵的空化性能,从而为泵的优化设计提供参考。
In this paper, the cavitation performance of a double-suction pump is studied by experiments and simulations. To obtain more accurate simulation results, the turbulence model and the cavitation model are improved and added to the CFX through the sec- ond development technology. Subsequently, the numerical results under the non-cavitation and cavitation conditions are compared with the experimental data. The comparison shows that the numerical prediction can truly predict the energy characteristics and cavi- tation characteristics of the double-suction pump. In addition, for a more comprehensive study of the cavitating flows in the double suction pump, not only vapor volume fraction distribution in impeller and cavity distribution in the suction chamber, but the static pressure distribution on intermediate cutting plane of pump and total pressure distribution in impeller passage are analyzed. The pres- ent study illustrates that the main reason for the decline of the pump performance is the development of cavitation, and the simulation can truly reflect the cavitation performance of the double-suction pump, thus providing a good reference for the optimization design of the pump.
出处
《中国农村水利水电》
北大核心
2013年第2期117-121,共5页
China Rural Water and Hydropower
基金
国家自然科学基金(50825902
51079062
51109095
51179075)
江苏省自然科学基金(BK2009006
BK2010346)
江苏省成果转化资金专项(BA2010155)
江苏高校优势学科建设工程资助项目
关键词
双吸泵
空化性能
空化模型
湍流模型
double-suction pump
cavitation performance
cavitation model
turbulence model
