中文摘要：

为了直观地得到压力脉动强度和位置特征，在求解非定常雷诺时均方程（URANS）数值计算的基础上，详细分析了单叶片离心泵内部压力脉动量的组成成分，并定义了考虑整个叶轮旋转周期内累积效应的压力脉动强度标准差算法来表征脉动源．通过与压力脉动测量结果的对比，验证了数值计算的可信性．对叶轮、蜗壳和前后泵腔流道内不同工况下的压力脉动强度和分布进行了对比分析，结果表明：不同运行流量对泵内周期性压力脉动的强度和位置有明显作用；总体上，流量越大，标准差脉动强度也相应越大；通过掌握压力脉动强度分布特性，能够为多工况运行的低压力脉动单叶片泵水力设计提供重要的理论依据．

英文摘要：

The URANS （unsteady Reynolds averaging Navier Stokes） equations were solved in the whole flow passage in time domain to obtain the information of unsteady pressure fluctuation intensity of complex fluid flow in a single-blade pump. The two components of periodic unsteady pressure were analyzed, and a non-dimensional coefficient of the magnitude of pressure fluctuation was defined for an entire revolution period. The numerical results were partially confirmed by the experimental results. The comparisons of fluctuation intensities in impeller, volute and side chamber domains for multi-con- ditions were carried out, and the quite obvious flow rate effect was observed on the magnitude distri- bution of periodic pressure fluctuation. In general, flow rate is bigger when pressure fluctuation inten- sity is larger. The pressure fluctuation intensity distribution can be an important theoretical basis for designing the low pressure fluctuation single-blade pumps under multi-conditions.