叶片安放角变化规律对离心泵性能影响分析

分析了3种不同叶片安放角变化规律对泵性能的影响.叶片工作面和背面的相对流速根据流道内质点运动微分方程求解,压力分布根据相对运动Bernoulli方程计算,将压力力矩沿叶片表面进行积分得到泵叶轮的等价输入功率.根据叶片表面的相对速度计算叶轮扬程的滑移系数,进而计算各工况下泵的扬程以及水力效率.通过分析及试验研究表明,采用滑移理论可以准确分析设计工况点叶片安放角变化规律对泵性能的影响,双圆弧和线性变化规律的差别对泵的扬程影响不大,单圆弧叶片叶轮的扬程略低.影响滑移系数的关键是叶片工作面靠近出口部分的型线的设计.

Analysis effects of blade angle on centrifugal pump performance

Effects of three variational blade angles on centrifugal pump performance are analyzed. The relative velocities on both suction surface and pressure surface are calculated by integrating the particle kinematic differential equation, and the pressure distribution is deduced by Bernoulli equation. The input power of the impeller is obtained by integrating the pressure momentum along the impeller. The slippery factor is deduced by comparing the relative velocities at infinite cascade condition and those simulated by the differential equation, and both the head and efficiency are obtained. According to the data simulated and the pump performance experimentally measured, the slippery th the pump head at design condition and the effect of blade angle on the distinction of double are blade and the linear-varying one has no performance, while the single blade produces lower head. The key factor is the blade pressure side near the trailing edge. eory can be used to accurately predict the pump performance. As a result, obviously different effect on the pump parameter that influences the slippery