多级泵透平运行的特性分析
发布时间：2019-05-27 16:16
【摘要】：流体流动到有高差的地方,或在流动中有压力降低的地方,有可利用的能量。由于离心水泵可反转用作水轮机,而且在双向运行条件下,最高效率基本相同。由于水泵具有上述优点,并且水泵经济性能良好,那么在有可利用能量的场合,是不是可以用水泵反转去回收在利用这些能量是一个值得研究的课题。因此本文旨在探索离心水泵反转的特性,寻找多级泵做透平运行的一般规律,研究改善多级泵透平运行的一般方法。 本文根据实际化工过程系统提供的流量,转速,压差,汽蚀余量等参数,介绍了本泵所采用的设计方法和用到的经验公式。在具体水力设计中采用自主开发的水泵CAD软件进行模型辅助设计,在通过数值模拟对模型进行优化修正,最终确定具有较高效率的多级泵模型,并使用三维造型软件对其各部件进行三维造型。 运用star-cd对该泵逆工况即水轮机工况的各个部件及整体的内部流场分别进行数值模拟。研究不同工况下,多级泵内部流场压力、速度分布规律,找出多级泵反转时影响其效率的主要因素,寻找其一般规律,并提出修改意见。 工作机工况时,对多级泵各个部件及整体的内部流场进行数值模拟。绘制该泵的扬程和效率曲线。分析在相同的工况下,多级泵做原动机和工作机时其流场变化,损失大小。探索多级泵透平运行时的一般流动规律。
[Abstract]:The fluid flows to places where there is a high difference, or where the pressure decreases in the flow, and there is energy available. Because the centrifugal pump can be reversed as a turbine, and under the condition of two-way operation, the maximum efficiency is basically the same. Because the pump has the above advantages and the economic performance of the pump is good, whether the pump can be reversed to recover the energy in the case of available energy is a topic worthy of study. Therefore, the purpose of this paper is to explore the characteristics of centrifugal pump inversion, to find out the general law of multistage pump turbine operation, and to study the general methods to improve the multistage pump turbine operation. According to the parameters such as flow rate, rotating speed, pressure difference and cavitation margin provided by the actual chemical process system, the design method and empirical formula of the pump are introduced in this paper. In the specific hydraulic design, the self-developed pump CAD software is used for model aided design, and the model is optimized and modified by numerical simulation, and the multi-stage pump model with high efficiency is finally determined. And use the three-dimensional modeling software to carry on the three-dimensional modeling to its each component. Star-cd is used to simulate the internal flow field of each part and the whole of the pump under the reverse working condition, that is, the turbine working condition. The distribution of flow field pressure and velocity in multistage pump under different working conditions is studied, the main factors affecting the efficiency of multistage pump are found out, the general law is found, and the suggestions for modification are put forward. When the working machine is working, the internal flow field of each component and the whole of the multi-stage pump is simulated. Draw the lift and efficiency curve of the pump. Under the same working condition, the flow field change and loss of multi-stage pump as prime mover and working machine are analyzed. The general flow law of multistage pump turbine is explored.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
本文编号：2486296
[Abstract]:The fluid flows to places where there is a high difference, or where the pressure decreases in the flow, and there is energy available. Because the centrifugal pump can be reversed as a turbine, and under the condition of two-way operation, the maximum efficiency is basically the same. Because the pump has the above advantages and the economic performance of the pump is good, whether the pump can be reversed to recover the energy in the case of available energy is a topic worthy of study. Therefore, the purpose of this paper is to explore the characteristics of centrifugal pump inversion, to find out the general law of multistage pump turbine operation, and to study the general methods to improve the multistage pump turbine operation. According to the parameters such as flow rate, rotating speed, pressure difference and cavitation margin provided by the actual chemical process system, the design method and empirical formula of the pump are introduced in this paper. In the specific hydraulic design, the self-developed pump CAD software is used for model aided design, and the model is optimized and modified by numerical simulation, and the multi-stage pump model with high efficiency is finally determined. And use the three-dimensional modeling software to carry on the three-dimensional modeling to its each component. Star-cd is used to simulate the internal flow field of each part and the whole of the pump under the reverse working condition, that is, the turbine working condition. The distribution of flow field pressure and velocity in multistage pump under different working conditions is studied, the main factors affecting the efficiency of multistage pump are found out, the general law is found, and the suggestions for modification are put forward. When the working machine is working, the internal flow field of each component and the whole of the multi-stage pump is simulated. Draw the lift and efficiency curve of the pump. Under the same working condition, the flow field change and loss of multi-stage pump as prime mover and working machine are analyzed. The general flow law of multistage pump turbine is explored.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
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