耦合几何参数与载荷参数的混流泵优化

王梦成; 夏鹤鹏; 颜红勤; 蒋红樱; 袁建平; 陈松山

doi:10.11975/j.issn.1002-6819.202210194

耦合几何参数与载荷参数的混流泵优化

1.
扬州大学电器与能源动力工程学院，扬州 225127
2.
江苏省水利工程科技咨询股份有限公司，南京 210029
3.
江苏大学国家水泵研究中心，镇江 212013

基金项目: 国家重点研发计划项目（2018YFB0606103）

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出版历程
- 收稿日期: 2022-10-24
- 修回日期: 2023-02-13
- 发布日期: 2023-03-14

Optimization of the mixed flow pumps with coupled geometric and loading parameters

1.
College of Electrical and Energy Power Engineering, Yangzhou University, Yangzhou 225127, China
2.
Hydraulic Engineering Science and Technology Consultation Limited Company of Jiangsu Province, Nanjing 210029, China
3.
National Research Center of Pumps, Jiangsu University, Zhenjiang 212023, China

摘要

摘要: 为进一步提升混流泵优化效果，并探究几何参数和载荷参数与导叶式混流泵能量特性间的响应关系，该研究结合正交试验与数值模拟，对比转速为511的导叶式混流泵叶轮开展参数优化研究。在试验验证数值模拟准确性的基础上，采用反问题设计方法，以0.85Qdes和1.15Qdes（Qdes为设计流量）处泵段水力效率为优化目标，以1.0Qdes处泵段扬程为约束条件，耦合轴面投影几何参数与流线方向载荷参数进行混流泵参数设计。研究结果表明：几何参数Lh和LS（前缘与轮毂及轮缘交点的X轴坐标）与载荷参数Kh、LEs、NCs和Ks（轮毂处中间直线斜率、轮缘处前缘载荷、轮缘处第一加载点横坐标和轮缘处中间直线段斜率）均对混流泵能量特性具有较大影响，在优化设计中均应被重点考虑；与原始模型相比，优化模型在叶轮出口附近具有更加合理的流场分布，可有效减少叶轮下游部件水力损失，其在0.85Qdes和1.15Qdes处的泵段效率分别提升了0.90和2.25个百分点。研究方法可为涡轮机械的参数化优化节约计算资源、最大化优化效果提供参考。
- 混流泵 /
- 优化 /
- 反问题设计 /
- 几何参数 /
- 载荷参数 /
- 数值模拟 /
- 正交设计
Abstract: Mixed flow pumps have been widely used in agricultural irrigation and drainage, industrial water circulation, and ship propulsion systems, due to their excellent overall performance. It is a high demand to optimize mixed-flow pumps for better energy conversion efficiency in recent years. This study aims to explore the influence of geometric and loading parameters on the energy characteristics, and then to further improve the optimization upper limit of the guide vane mixed flow pump. A parametric optimization was also carried out on the impeller of a guide vane mixed-flow pump with a specific speed of 511. Among them, the geometric and the loading parameters were taken as the design parameters, whereas, the pump section efficiencies at 0.85Qdes and 1.15Qdes were taken as the optimization objectives, and the pump section head under the design condition was as the constraint condition. Taguchi design and numerical simulation were also combined in this case. The inverse design method was adopted to verify the accuracy of numerical simulation. The results show that only 27 schemes needed to be constructed in the optimal design of 13 design parameters with 2 optimization objectives and 1 constraint using orthogonal design. Therefore, Taguchi design performed better in the multi-factor coupling optimization, which effectively reduced the amount of calculation. The extreme difference analysis showed that the effect of each parameter on the efficiency at 0.85Qdes was ranked in the descending order of Kh, Ls, NDs, LEs, NCs, ST, NCh, Lh, Ks, Ts, NDh, LEh, and Th (LE is the leading edge loading, NC is the horizontal coordinates of first loading point, ND is the horizontal coordinates of second loading point, K is the slope of middle straight, Lh and LS represent the X axis horizontal coordinates of the intersection point of the blade leading edge with hub and shroud, Th and TS represent the X axis horizontal coordinates of the intersection point of the blade trailing edge with hub and shroud, the subscripts h and s represent hubs and shroud, respectively.), in order to maximize the efficiency at 0.85Qdes in the levels of 1, 3, 2, 1, 3, 2, 3, 2, and 1, respectively. Similarly, the effect of each parameter on the efficiency at 1.15Qdes was ranked in the descending order of the LEs, Kh, LEh, Lh, Ls, Ks, NDh, Ts, NCs, NCh, NDs, ST, and Th, in order to maximize the efficiency at 1.15Qdes with the levels of 3, 1, 3, 3, 3, 1, 1, 3, 1, 3, 2, 2, and 2, respectively. The effect of each parameter on the head at 1.0Qdes was ranked in the order of NDh, Kh, NCs, ST, Ks, NDs, LEs, Ts, Ls, Lh, NCh, LEh, and Th. According to the influence of each parameter on the optimization objectives and constraint, the geometric parameters (Lh and Ls) and the load parameters (Kh, LEs, NCs and Ks) posed a significant impact on the performance of the mixed-flow pump, which should be considered in the optimization design. Compared with the original, the pump section head of the optimal model was basically unchanged at 1.0Qdes, which fully met the constraint requirements. Meanwhile, the pump section efficiencies at 0.85Qdes and 1.15Qdes increased by 0.90 and 2.25 percentage points, respectively, which fully meeting the optimization requirements. The internal flow analysis showed that the pressure and velocity distribution near the blade leading edge of the optimized model was significantly improved, compared with the original. In addition, the hydraulic losses of downstream components were also significantly reduced in the optimized model, which was mainly due to the improvement of the uniformity of flow field distribution at the outlet of the impeller. In conclusion, this finding can provide an important reference for the parameterized optimization of turbomachinery, in order to save computational resources and maximize the optimization effect.
- mixed-flow pump /
- optimization /
- inverse design /
- geometric parameter /
- loading parameter /
- numerical simulation /
- orthogonal design

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