Numerical simulation and experimental study of transient characteristics in an axial flow pump during start-up
Numerical simulation and experimental study of transient characteristics in an axial flow pump during start-up
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轴流泵启动瞬态特性数值模拟与实验研究
DOI：
10.1016/j.renene.2019.07.123
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发表时间：
2020-02-01
期刊：
影响因子：
8.7
通讯作者：
Tian, Xiaoqing
中科院分区：
文献类型：
--
作者：
Fu, Shifeng;Zheng, Yuan;Tian, Xiaoqing
为了探讨泵站系统在非调节工况下瞬态流的冲击载荷和瞬时流体压力，对轴流泵启动过程的瞬态特性进行了实验和数值研究。为了模拟泵的瞬态流动，通过力耦合设置合理的转速。采用动网格技术模拟双扇闸门的运动。数值模拟结果与实验数据吻合较好。在启动瞬态过程中，泵的转速、扬程、流量等瞬态特性参数变化较大。当转速达到额定转速时，瞬时冲击压头上升到额定压头的1.87倍的峰值。整个叶轮通道内存在着回流、分离和旋涡。叶轮叶片的压力分布发生了明显的变化。在水泵启动过程中，涡核区逐渐增大，在t = 0.6s时大量出现在叶片前缘和叶轮流道内，然后减小。本文的研究对工程中避免泵的振动和叶片裂纹有一定的指导意义. (C)2019爱思唯尔有限公司版权所有。
In order to explore the impact load and instantaneous fluid pressure of transient flow on pump station system under the nonregulative operating conditions, the transient characteristics of an axial flow pump during start-up process are investigated experimentally and numerically. To simulate transient flow of the pump, the rational speed is set by force coupling. In order to simulate the movement of the gate with two flap doors attached, the moving mesh technique is adopted. The results of numerical simulation agree well with the experimental data. During the start-up transient process, the transient characteristics parameters, such as pump rotational speed, head, and flow rate change significantly. Transient impact head rises to a peak of 1.87 times the rated head as the rotational speed reaches the rated speed. The whole impeller passage is full of recirculation, flow separation and vortices. The pressure distribution of the impeller blade changes obviously. In the process of pump start-up, the vortex core zones gradually increase, massively appear at the leading edges of the blade and in the passage of the impeller at t = 0.6 s, and then decrease. Our studies could help to avoid pump vibration and blade crack in engineering. (C) 2019 Elsevier Ltd. All rights reserved.