双吸泵空化非定常数值分析

发布时间：2019-06-11 00:43

【摘要】：为了分析双吸泵内部非定常空化流,采用SST湍流模型及基于Rayleigh-Plesset方程的输运空化模型,对双吸泵空化流场进行定常与非定常模拟,得到了双吸泵内流场空化初生部位及空化发展情况,并设置监测点分析了空化状态下双吸泵内不同位置处的压力脉动特性。结果表明,空化首先发生于叶片吸力面头部靠近前盖板处,随着空化余量的降低,空化面积及空泡体积分数不断增大,空化继续发展后,空泡会逐渐向叶片吸力面及叶轮出口扩散,从而降低泵的扬程;在一个旋转周期内,单个叶片上的空化状态呈现出由弱变强、再由强变弱的发展趋势;随着空化余量的降低,监测点处压力脉动幅值增加,蜗壳流道内压力脉动的主频为叶频,谐频为叶频的倍数,且蜗壳隔舌处的压力脉动幅值最大。
[Abstract]:In order to analyze the unsteady cavitation flow in double suction pump, SST turbulence model and transport cavitation model based on Rayleigh-Plesset equation are used to simulate the cavitation flow field of double suction pump. The primary cavitation position and cavitation development of the flow field in the double suction pump are obtained, and the pressure pulsation characteristics at different positions in the double suction pump are analyzed by setting up monitoring points. The results show that cavitation first occurs at the head of the suction surface of the blade near the front cover plate. With the decrease of the cavitation margin, the cavitation area and cavitation volume fraction increase, and after the cavitation continues to develop, The cavitation will gradually spread to the suction surface of the blade and the outlet of the impeller, thus reducing the lift of the pump. In a rotating cycle, the cavitation state on a single blade shows a development trend from weak to strong, and then from strong to weak. With the decrease of cavitation margin, the amplitude of pressure fluctuation at the monitoring point increases. The main frequency of pressure fluctuation in volute channel is blade frequency, the harmonic frequency is a multiple of blade frequency, and the amplitude of pressure fluctuation at volute tongue septum is the largest.
【作者单位】：西华大学能源与动力工程学院;西华大学流体及动力机械教育部重点实验室;
【基金】：国家自然科学基金项目(51279172) 西华大学重点科研基金资助项目(Z1510417);西华大学省部级学科平台开放课题(szjj2016-004) 流体及动力机械四川省科研创新研究团队项目(x1404)
【分类号】：TH311

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