部分流泵优化设计及其数值计算
发布时间：2018-12-12 22:58
【摘要】：对于部分流泵的研究,以前主要集中在高速部分流泵的性能试验研究方面,因在低比转速下的性能优势,现已逐渐应用于民用工业、消防领域。关于部分流泵的研究也逐渐从高转速转移到常规转速。该类型泵的水力设计,长期以来都采用常规设计方法,即根据给定的设计参数,依据经验公式,确定泵的几何参数。 随着计算机技术的发展,有学者利用CFD技术对部分流泵进行了内部流场模拟,并对几何参数的优化设计方法进行了探讨。然而上述探讨都属于常规设计范畴,在部分流泵的研究中,还可以进一步利用现代优化方法进行设计。 本文将以常转速单级部分流泵为例,基于遗传算法,借助Matlab软件,对此部分流泵进行间接优化设计,并对常规设计和优化设计两种方案进行数值计算,目的在于对比、检验优化设计方法的可行性和合理性。具体工作如下: 1.通过建立部分流泵扬程与其关键参数的表达式,基于泵扬程和效率之间关系的间接优化思想,以筛选出的部分流泵的主要几何参数和动力参数为变量,结合遗传优化算法,建立了部分流泵的优化设计模型,借助Matlab软件对部分流泵进行了优化。 2.采用雷诺时均N-S方程、RNG k-ε湍流模型和泵进、出口定常条件,对常规方法设计的和本文的优化方法设计的部分流泵进行CFD计算和性能预测。流场模拟和性能预测结果表明:采用优化方法设计的部分流泵,其效率平均提高了6.1%,效率明显提高,性能显著改善;泵内部的速度场和压力场分布更加均匀,泵的增压效果比较突出。 3.从部分流泵内流理论的本质入手,依据泵的基本方程,推导了部分流泵的性能参数与其主要的几何参数之间的函数关系式,探讨了部分流泵在稳态情况下的流动特征,为其进一步的优化提供理论依据。
[Abstract]:The research of partial flow pump is mainly focused on the performance test of high speed partial flow pump. Because of its performance advantage at low specific speed, it has been gradually applied in civil industry and fire protection field. The research on partial flow pump has been gradually transferred from high speed to conventional speed. For a long time, the hydraulic design of this type of pump has adopted the conventional design method, that is, according to the given design parameters and empirical formula, the geometric parameters of the pump are determined. With the development of computer technology, some scholars use CFD technology to simulate the internal flow field of partial flow pump, and discuss the optimization design method of geometric parameters. However, all of the above researches belong to the conventional design category. In the research of partial flow pump, the modern optimization method can be used to design the pump. In this paper, the single stage partial flow pump with constant rotational speed is taken as an example. Based on genetic algorithm and with the aid of Matlab software, the indirect optimization design of the partial flow pump is carried out, and the two schemes of conventional design and optimal design are numerically calculated, the purpose of which is to compare the two schemes. Verify the feasibility and rationality of the optimal design method. The specific work is as follows: 1. Based on the indirect optimization idea of the relationship between pump head and efficiency, the main geometric and dynamic parameters of the selected partial flow pump are taken as variables, and the genetic optimization algorithm is combined. The optimization design model of partial flow pump is established, and the partial flow pump is optimized by Matlab software. 2. Using Reynolds time averaged N-S equation, RNG k- 蔚 turbulence model and steady condition of pump inlet and outlet, the CFD calculation and performance prediction of the partial flow pump designed by the conventional method and the optimization method in this paper are carried out. The results of flow field simulation and performance prediction show that the efficiency of the partial flow pump designed by the optimization method is improved by an average of 6.1%, the efficiency is obviously improved, and the performance of the pump is improved significantly. The distribution of velocity field and pressure field in pump is more uniform, and the booster effect of pump is more outstanding. 3. Starting from the essence of the internal flow theory of partial flow pump and according to the basic equations of pump, the functional relationship between the performance parameters of partial flow pump and its main geometric parameters is derived, and the flow characteristics of partial flow pump in steady state are discussed. It provides theoretical basis for further optimization.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
本文编号：2375387
[Abstract]:The research of partial flow pump is mainly focused on the performance test of high speed partial flow pump. Because of its performance advantage at low specific speed, it has been gradually applied in civil industry and fire protection field. The research on partial flow pump has been gradually transferred from high speed to conventional speed. For a long time, the hydraulic design of this type of pump has adopted the conventional design method, that is, according to the given design parameters and empirical formula, the geometric parameters of the pump are determined. With the development of computer technology, some scholars use CFD technology to simulate the internal flow field of partial flow pump, and discuss the optimization design method of geometric parameters. However, all of the above researches belong to the conventional design category. In the research of partial flow pump, the modern optimization method can be used to design the pump. In this paper, the single stage partial flow pump with constant rotational speed is taken as an example. Based on genetic algorithm and with the aid of Matlab software, the indirect optimization design of the partial flow pump is carried out, and the two schemes of conventional design and optimal design are numerically calculated, the purpose of which is to compare the two schemes. Verify the feasibility and rationality of the optimal design method. The specific work is as follows: 1. Based on the indirect optimization idea of the relationship between pump head and efficiency, the main geometric and dynamic parameters of the selected partial flow pump are taken as variables, and the genetic optimization algorithm is combined. The optimization design model of partial flow pump is established, and the partial flow pump is optimized by Matlab software. 2. Using Reynolds time averaged N-S equation, RNG k- 蔚 turbulence model and steady condition of pump inlet and outlet, the CFD calculation and performance prediction of the partial flow pump designed by the conventional method and the optimization method in this paper are carried out. The results of flow field simulation and performance prediction show that the efficiency of the partial flow pump designed by the optimization method is improved by an average of 6.1%, the efficiency is obviously improved, and the performance of the pump is improved significantly. The distribution of velocity field and pressure field in pump is more uniform, and the booster effect of pump is more outstanding. 3. Starting from the essence of the internal flow theory of partial flow pump and according to the basic equations of pump, the functional relationship between the performance parameters of partial flow pump and its main geometric parameters is derived, and the flow characteristics of partial flow pump in steady state are discussed. It provides theoretical basis for further optimization.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
【引证文献】
相关硕士学位论文 前1条
1 钱晨;低比转速离心泵圆盘损失计算的探讨及内部流动特征的数值分析[D];兰州理工大学;2012年
，本文编号：2375387
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