摘要
为了提高设计过程中对混流泵性能的可控制程度,开展了出口环量分布规律对混流泵性能的影响研究。基于三元反设计理论,将环量V u r在轴面流线方向上的偏导数作为载荷分布的控制参数,根据出口环量分布规律的不同设计了平均型、递增型和递减型3个混流泵叶轮。基于雷诺时均Navier-Stokes方程、SST湍流模型和多重参考坐标系模型对泵内流场进行数值模拟,对泵的效率、空化、叶轮出口的总压及轴面速度沿叶高的分布规律进行比较与分析。结果表明:递增型泵效率最高但空化最差,递减型泵性能正好相反;基于变出口环量分布的三元反设计方法能有效控制叶片不同叶高处的做功能力,递增型叶轮出口的总压和轴面速度随半径增加而增加的速度最快。
In order to improve controllability of mixed-flow pump performances during the design process, effects of exit circulation distribution on design of mixed-flow pump impeller were researched. Based on three-dimensional inverse design theory, the meridional derivative of circulation Vur was chosen for the control parameter of blade loading distributions. Three impellers were designed, whose exit circulations were respectively averaged-loaded, rising-loaded and falling-loaded. The RANS equations embedded with SST turbulence model were solved by using multiple-reference-frame model to simulate flow field of the three pumps. The pump efficiency and cavitation, total pressure and meridional velocity at the impeller exit were compared and analyzed. The results show that the rising-loaded pump has the highest efficiency but the worst cavitation performance, and performances of the falling-loaded pump are just on the contrary. The three-dimensional inverse design theory with adjustable exit circulations can effectively adjust the work abilities at different blade heights. Both the total pressure and meridional velocity at the rising-loaded impeller exit the rapidest increasing velocity with the radius rising.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2014年第1期89-93,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51009142)
关键词
混流泵
叶轮
出口环量
数值模拟
空化
Mixed-flow pump Impeller Exit circulation Numerical simulation Cavitation
