前置诱导轮对低比转速离心泵汽蚀特性和内部流场的影响
发布时间：2019-07-03 09:29
【摘要】：低比转速离心泵具有流量小、扬程高的特点,在石油和化工等领域有着广泛的应用。汽蚀性能差一直是困扰低比转速离心泵研制和发展的关键难题之一。当离心泵发生汽蚀时,将产生振动和噪声,汽蚀特别严重时离心泵机组将不能正常工作,从而严重降低了泵的使用效率和工作的稳定性,在叶轮前安装诱导轮是提高离心泵抗汽蚀性能的主要方法。因此分析前置诱导轮对低比转速离心泵汽蚀特性和内部流场的影响具有重要的意义。本文采用数值模拟和实验的方法对有和无前置诱导轮的低比转速离心泵的汽蚀特性和内部流动进行分析,具体工作如下:(1)采用UG8.0三维实体建模软件,对离心泵的过流部件进行实体建模,主要包括等螺距两叶片诱导轮、后弯式叶轮和环形蜗壳。利用ICEM网格划分软件对各个过流部件进行网格划分。然后导入CFD软件PumpLinx进行了非汽蚀和汽蚀工况下的数值模拟计算。(2)在非汽蚀工况下,基于标准k-ε湍流模型对无和有前置诱导轮的低比转速离心泵内部流场进行了数值计算,并在不同流量工况点下,对比分析了两台泵内叶轮中截面的压力分布、速度分布以及蜗壳上的压力脉动。(3)在汽蚀工况下,基于全空化模型对无和有前置诱导轮的低比转速离心泵内部流场进行了数值计算,对比分析了设计工况点时不同汽蚀余量下两台泵叶轮中截面的气相体积分数分布,及泵进口壁面、叶轮内部流道和蜗壳上的压力脉动;并获得了诱导轮内部及叶轮叶片上的气相体积分数分布。(4)对前置诱导轮的低比转速离心泵进行了外特性实验和汽蚀性能实验,获得了前置诱导轮离心泵的外特性曲线和设计工况点的汽蚀性能曲线;并与数值计算结果进行了对比分析,验证了数值模拟计算的可靠性。
[Abstract]:Low specific speed centrifugal pump is widely used in petroleum and chemical industry because of its low flow rate and high lift. Poor cavitation performance has always been one of the key problems in the research and development of low specific speed centrifugal pumps. When cavitation occurs, vibration and noise will occur, and the centrifugal pump unit will not work normally when cavitation is especially serious, thus seriously reducing the efficiency and stability of the pump. Installing the induction wheel in front of the impeller is the main method to improve the cavitation resistance of the centrifugal pump. Therefore, it is of great significance to analyze the cavitation characteristics and internal flow field of low specific speed centrifugal pump. In this paper, numerical simulation and experimental methods are used to analyze the cavitation characteristics and internal flow of low specific speed centrifugal pumps with and without front inducers. the specific work is as follows: (1) using UG8.0 three-dimensional solid modeling software, the overflowing parts of centrifugal pumps are modeled, including equal pitch two-blade induction wheel, rear bending impeller and annular volute. The ICEM meshing software is used to mesh each overflowing component. Then the CFD software PumpLinx is introduced into the numerical simulation of non-cavitation and cavitation conditions. (2) under the non-cavitation condition, the internal flow field of low specific speed centrifugal pump without and with front induction wheel is calculated based on the standard k-蔚 turbulence model, and the pressure distribution of the inner section of the impeller in the two pumps is compared and analyzed under different flow conditions. Velocity distribution and pressure fluctuation on volute. (3) under cavitation condition, the internal flow field of low specific speed centrifugal pump with no and no front inducer is calculated based on cavitation model, and the gas volume fraction distribution of the section of the impeller under different cavitation allowance is compared and analyzed, and the pressure fluctuation on the inlet wall of the pump, the inner passage of the impeller and the volute is compared and analyzed. The gas phase volume fraction distribution inside the induction wheel and on the impeller blade is obtained. (4) the external characteristics and cavitation performance experiments of the low specific speed centrifugal pump with the front induction wheel are carried out, and the external characteristic curve and the cavitation performance curve of the design working condition point of the front induction wheel centrifugal pump are obtained, and the results are compared with the numerical results to verify the reliability of the numerical simulation calculation.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311
本文编号：2509275
[Abstract]:Low specific speed centrifugal pump is widely used in petroleum and chemical industry because of its low flow rate and high lift. Poor cavitation performance has always been one of the key problems in the research and development of low specific speed centrifugal pumps. When cavitation occurs, vibration and noise will occur, and the centrifugal pump unit will not work normally when cavitation is especially serious, thus seriously reducing the efficiency and stability of the pump. Installing the induction wheel in front of the impeller is the main method to improve the cavitation resistance of the centrifugal pump. Therefore, it is of great significance to analyze the cavitation characteristics and internal flow field of low specific speed centrifugal pump. In this paper, numerical simulation and experimental methods are used to analyze the cavitation characteristics and internal flow of low specific speed centrifugal pumps with and without front inducers. the specific work is as follows: (1) using UG8.0 three-dimensional solid modeling software, the overflowing parts of centrifugal pumps are modeled, including equal pitch two-blade induction wheel, rear bending impeller and annular volute. The ICEM meshing software is used to mesh each overflowing component. Then the CFD software PumpLinx is introduced into the numerical simulation of non-cavitation and cavitation conditions. (2) under the non-cavitation condition, the internal flow field of low specific speed centrifugal pump without and with front induction wheel is calculated based on the standard k-蔚 turbulence model, and the pressure distribution of the inner section of the impeller in the two pumps is compared and analyzed under different flow conditions. Velocity distribution and pressure fluctuation on volute. (3) under cavitation condition, the internal flow field of low specific speed centrifugal pump with no and no front inducer is calculated based on cavitation model, and the gas volume fraction distribution of the section of the impeller under different cavitation allowance is compared and analyzed, and the pressure fluctuation on the inlet wall of the pump, the inner passage of the impeller and the volute is compared and analyzed. The gas phase volume fraction distribution inside the induction wheel and on the impeller blade is obtained. (4) the external characteristics and cavitation performance experiments of the low specific speed centrifugal pump with the front induction wheel are carried out, and the external characteristic curve and the cavitation performance curve of the design working condition point of the front induction wheel centrifugal pump are obtained, and the results are compared with the numerical results to verify the reliability of the numerical simulation calculation.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311
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