摘要
针对过去过多地依赖经验确定复合叶轮短叶片偏置位置和角度的弊端,提出了采用先进控制流理论来控制短叶片偏置的优化设计方法.首先根据离心式后向叶轮流道内流体微团的受力情况,建立沿流线法线方向的受力平衡微分方程,再根据相对运动Bernoulli方程,推导出沿流线法线方向压强梯度与速度梯度的关系,进而得出沿流线法向速度梯度与几何结构之间的关系.通过对几个相关式子的分析,可确定周向最佳偏置位置.同时考虑将短叶片进口边适度向吸力面偏斜,以期实现后加载特性.试验结果表明,分析所得结论比较符合试验数据,证明了理论分析的可靠性.
To overcome the shortcomings of fully depending on experience in the past while choosing the offset position and offset angle of splitting blades in centrifugal pump compound impellers,the advanced control-flow theory was used to optimize splitting blades design.First of all,on the basis of the fluid element stress conditions in flow passage of centrifugal backward sweep impellers,the equilibrium of force perpendicular to the streamline was established.Subsequently,along normal orientation to the streamline,the relevant formula between pressure gradient and relative velocity gradient was deduced from relatively movement Bernoulli equation.Furthermore,the relation between pressure gradient normal to the streamline and geometry structure was obtained.Then the prime offset location was identified by analyzing several correlative formulas.At the same time,splitting blade inlet was offsetted moderately to suction side to realize the after-loading characteristic.The test results show that the analysis conclusions match the experimental data very well and are proved to be reasonable.
出处
《排灌机械工程学报》
EI
2010年第5期402-406,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(50579083)
关键词
离心泵
复合叶轮
偏置叶片
先进控制流理论
优化方法
centrifugal pump
compound impeller
offset splitting blades
advanced control-flow theory
optimization method
