中文摘要：

为研究不同叶片数下管道泵内部的流动特性及振动特性，采用标准k-e湍流模型和滑移网格技术，在CFX数值计算软件中，分别对6叶片和7叶片的管道泵内部全流场进行三维非定常数值模拟，计算得到不同流量下叶轮内部流动特性、蜗壳内部静压特性以及叶轮转矩波动特性。对比0．1q，工况下两种叶片数下的数值计算结果，发现6叶片下的“射流-尾迹”效应及静压变化梯度均大于7叶片，6叶片下的转矩波动强度大于7叶片；不同叶片数下，叶轮内部的相对速度变化规律、静压变化规律以及蜗舌附近低压区的发展变化规律与蜗舌和叶轮的相对位置有关。采用振动试验测量不同叶片数下管道泵的振动水平，分析振动试验结果和数值计算结果表明，在不同流量下，6叶片的振动水平高于7叶片，主要在于6叶片具有较强的压力脉动和不稳定流体力的作用；叶频及其倍频是管道泵产生振动的主要激励频率。因此，可以通过优化叶片设计参数（Z，β2，β1）来改善管道泵内部的不稳定流动状态，进而降低振动水平。

英文摘要：

A study is presented to understand both the flow characteristics and the vibration characteristics of the in-line circulator pump with different blades numbers. The 3D unsteady flow numerical simulations are executed both on 6 blades and 7 blades of in-line circulator pumps for successfully capturing the flow characteristics inside the impeller, static pressure characteristics inside the volute and torque fluctuation characteristics of impeller, in the different flow rates conditions, which is based on the standard k-e turbulence model and sliding mesh technique provided by CFX. In comparison with numerical simulation results of both two different blades numbers in the condition of 0. lqv, the findings show that both the ＂jet-wake＂ effect and gradient of static pressure of 6 blades are higher than 7 blades＇, and the amplitude of torque fluctuation of 6 blades is higher than 7 blades＇. Moreover, the laws of both relative velocity changes and static pressure changes inside the impeller and the law of low pressure region changes near the tongue of the volute, which are corresponding to the relative position changes between the tongue and the blade. Additionally, the experimental vibration tests are conducted to measure the vibration level of in-line circulation with different blades numbers. By analyzing the experimental results and simulation results, it is revealed that vibration amplitudes of 6 blades are higher than 7 blades＇ in different flow rates conditions because of stronger pressure pulsation and unsteady fluid forces, and blade passing frequency and its harmonic are the domain active frequencies for the pump vibration. Therefore, both the unsteadiness of flow and vibration level of in-line circulator pump can be reduced by means of optimizing the blade parameters（Z,β2, β1）.