叶片包角对离心泵流场及脉动特性的影响
发布时间：2019-02-22 09:12
【摘要】：针对离心泵非定常流动压力脉动特性,采用滑移网格的大涡模拟技术对叶片包角分别为95°,100°,105°,108°的4副叶轮进行数值模拟.分析了叶片包角对离心泵水力性能、叶轮出口"射流-尾迹"、测点压力脉动频谱特性和叶轮径向力的影响关系.结果表明:随着包角的增大,离心泵的水力性能下降;包角适当增大,会使叶轮射流-尾迹流动结构变弱.在设计工况下,蜗舌附近测点压力脉动最大;在蜗壳螺旋段压力脉动强度沿流动方向逐渐变弱,而在叶轮流道内压力脉动沿流动方向逐渐增强,在叶轮出口处达到最大;而离心泵叶轮所受径向力随着包角的增大而减小,适当地增大包角可以提高离心泵运行的可靠性.
[Abstract]:According to the pressure pulsation characteristics of unsteady flow in centrifugal pump, four impellers with blade enveloping angles of 95 掳, 100 掳, 105 掳and 108 掳were numerically simulated by the large eddy simulation technique of slip grid. The influence of blade angle on hydraulic performance of centrifugal pump, impeller outlet "jet-wake", spectrum characteristics of pressure pulsation and radial force of impeller are analyzed. The results show that the hydraulic performance of centrifugal pump decreases with the increase of the envelope angle, and the impeller jet-wake flow structure weakens with the increase of the inclusion angle. Under the design condition, the pressure pulsation at the measuring point near the cochlear tongue is the largest, the pressure fluctuation intensity in the spiral section of the volute becomes weaker along the flow direction, but in the impeller passage, the pressure fluctuation increases gradually along the flow direction and reaches the maximum at the impeller outlet. The radial force of the centrifugal pump impeller decreases with the increase of the envelope angle, and the reliability of the centrifugal pump can be improved by properly increasing the envelope angle.
【作者单位】： 上海理工大学能源与动力工程学院;上海理工大学上海市动力工程多相流动与传热重点实验室;上海船舶设备研究所;
【基金】：国家自然科学基金资助项目(51106099,50976072) 上海市科委科研计划项目(13DZ2260900)
【分类号】：TH311
本文编号：2428065
[Abstract]:According to the pressure pulsation characteristics of unsteady flow in centrifugal pump, four impellers with blade enveloping angles of 95 掳, 100 掳, 105 掳and 108 掳were numerically simulated by the large eddy simulation technique of slip grid. The influence of blade angle on hydraulic performance of centrifugal pump, impeller outlet "jet-wake", spectrum characteristics of pressure pulsation and radial force of impeller are analyzed. The results show that the hydraulic performance of centrifugal pump decreases with the increase of the envelope angle, and the impeller jet-wake flow structure weakens with the increase of the inclusion angle. Under the design condition, the pressure pulsation at the measuring point near the cochlear tongue is the largest, the pressure fluctuation intensity in the spiral section of the volute becomes weaker along the flow direction, but in the impeller passage, the pressure fluctuation increases gradually along the flow direction and reaches the maximum at the impeller outlet. The radial force of the centrifugal pump impeller decreases with the increase of the envelope angle, and the reliability of the centrifugal pump can be improved by properly increasing the envelope angle.
【作者单位】： 上海理工大学能源与动力工程学院;上海理工大学上海市动力工程多相流动与传热重点实验室;上海船舶设备研究所;
【基金】：国家自然科学基金资助项目(51106099,50976072) 上海市科委科研计划项目(13DZ2260900)
【分类号】：TH311
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