轴流泵空化流动的非定常特性研究

发布时间：2018-06-19 22:33

  本文选题：轴流泵 + 空化　； 参考：《中国农村水利水电》2017年11期

【摘要】：为了研究轴流泵内部空化流的非定常特性,基于ANSYS CFX软件,应用SST k-ω湍流模型和RayleighPlesset的均相流空化模型,对一台轴流泵在最优工况点下的空化流场进行了定常与非定常数值模拟,获得轴流泵的外特性与空化性能,并与试验结果进行了对比。同时对泵内不同位置、不同空化余量下的压力脉动进行了时域和频域分析。结果表明:空泡首先出现在叶片背面进口边轮缘处,随着空化余量的降低,空泡逐渐向叶片中部发展,直至覆盖整个叶片背面;空化的发生会改变叶片背面的压力分布,影响泵的性能;叶轮进口和出口处监测点的压力脉动具有明显的周期性,全部有3个波峰和波谷,与叶片数紧密相关;空化发生后,不同工况下叶轮出口压力波动均明显增强,且其主频均为叶频。
[Abstract]:In order to study the unsteady characteristics of cavitation flow in an axial flow pump, a steady and unsteady numerical simulation of cavitation flow field of an axial flow pump under optimal operating conditions is carried out by using SST k- 蠅 turbulence model and RayleighPlesset's homogeneous flow cavitation model based on ANSYS CFX software. The external characteristics and cavitation performance of the axial flow pump are obtained and compared with the experimental results. At the same time, the pressure pulsation in different positions and different cavitation residuals in the pump are analyzed in time domain and frequency domain. The results showed that the cavitation first appeared at the flange of the inlet edge of the back of the blade, and with the decrease of cavitation allowance, the cavitation gradually developed to the middle of the blade until it covered the whole back of the blade, and the occurrence of cavitation would change the pressure distribution on the back of the blade. The pressure pulsation at the impeller inlet and outlet has obvious periodicity, all of them have three peaks and troughs, which are closely related to the number of blades. After cavitation, the pressure fluctuation at the outlet of the impeller increases obviously under different working conditions. The main frequency is leaf frequency.
【作者单位】： 江苏大学国家水泵及系统工程技术研究中心;江苏大学能源与动力工程学院;江苏大学-镇江流体装备技术研究院;
【基金】：国家自然科学基金资助项目(51609107) 国家科技支撑计划项目(2015BAD20B01) 江苏省青年基金资助项目(BK20160539) 江苏大学高级人才启动基金资助项目(15JDG073)
【分类号】：TH312
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本文编号：2041608