相同叶栅稠密度下叶片数对复合式叶轮内流场的影响

doi:10.3901/JME.2022.14.320

机械工程学报 ›› 2022, Vol. 58 ›› Issue (14): 320-327.doi: 10.3901/JME.2022.14.320

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相同叶栅稠密度下叶片数对复合式叶轮内流场的影响

宁超¹, 袁寿其¹, 李亚林¹, 徐慧², 郑峰²

1. 江苏大学国家水泵及系统工程技术研究中心镇江 212013;
2. 宁波方太厨具有限公司宁波 315336

收稿日期:2021-01-31 修回日期:2021-10-08 出版日期:2022-07-20 发布日期:2022-09-07
通讯作者: 李亚林(通信作者)，男，1984年出生，副研究员，硕士研究生导师。主要研究方向为水力系统内部流动的PIV试验和CFD数值模拟。E-mail：ylli@ujs.edu.cn
作者简介:宁超，女，1990年出生，博士研究生。主要研究方向为流体机械内部流场CFD数值模拟。E-mail：dream0830@163.com;袁寿其，男，1963年出生，研究员，博士研究生导师。主要研究方向为排灌机械及流体机械。E-mail：shouqiy@ujs.edu.cn
基金资助:
国家自然科学基金青年(51809120)、江苏省自然科学基金(BK20180871)、中国博士后科学基金(2018M640462)和江苏省高等学校自然科学研究(18KJB470005)资助项目。

Influence of Blade Numbers at the Same Cascade Density on the Characteristics of Composite Impeller

NING Chao¹, YUAN Shouqi¹, LI Yalin¹, XU Hui², ZHENG Feng²

1. China National Research Center of Pump, Jiangsu University, Zhenjiang 212013;
2. Ningbo FOTILE Kitchen Ware Co., Ltd., Ningbo 315336

Received:2021-01-31 Revised:2021-10-08 Online:2022-07-20 Published:2022-09-07

摘要/Abstract

摘要： 由于复合式叶轮的复杂结构，叶轮中会产生间隙涡、轴向旋涡等涡结构，这些涡会严重影响流体机械的内流场及外特性。为了揭示叶片数对新型开放式水泵水力性能及内部流场的影响，采用k-ε湍流模型，对相同叶栅稠密度下四种不同的叶片数方案进行了数值模拟，研究了各方案叶轮的内流特征，结果表明蜗壳的双隔舌设计对叶轮流道内的流场产生影响，叶轮内流动呈现交替变化的规律，叶轮进口和出口受到较高的湍流作用而中心处涡强度相对较低。随着叶片数的增大，复合式叶片的水力性能升高，叶轮内压力减小但涡量明显增大，涡的强度也随之增大。通过Q准则对涡结构的识别，分析了不同截面处涡团的分布，结果表明叶片尾缘脱落涡与二次流相互作用在叶轮吸力面产生大量的涡结构。叶顶间隙的泄漏涡从叶片背面向流道中间发展，随着流动的发展，涡的范围变大，形状也发生改变。研究结果为复合式叶轮叶片数的选取提供了理论依据。

关键词: 叶片数, 复合式叶轮, Q准则, 数值模拟

Abstract: Due to the complex structure of the composite impeller, vortex structures such as tip leakage vortex and axial vortex will be generated in the impeller, which will seriously affect the internal flow field and the performance of fluid machinery. In order to reveal the influence of the number of blades on the hydraulic performance and internal flow field of the new open pump, the k-ε turbulence model was used to simulate four different blade number schemes with the same cascade density. The results show that the double tongue design of volute has effect on the flow field in the impeller channel, and the flow in the blade presents the law of alternating change. The inlet and outlet of the impeller are subject to high turbulence, while the vortex intensity at the central is relatively low. With the increase of the number of blades, the hydraulic performance of the composite blade increases, the pressure in the impeller decreases, but the vorticity increases obviously, and the strength of the vortex increases. The distribution of vortices at different sections is analyzed by Q-criterion, the results show that a number of vortex structures are generated on the suction surface of the impeller due to the interaction between the trailing edge vortex and the secondary flow. The leakage vortex in tip clearance develops from the back of blade to the middle of runner. With the development of flow, the range of vortices becomes larger and the shape of vortices also changes. In conclusion, the above results can provide reference for choosing blade numbers of the composite impeller.

Key words: blade number, composite impeller, Q-criterion, numerical simulation

中图分类号:

TH311

宁超, 袁寿其, 李亚林, 徐慧, 郑峰. 相同叶栅稠密度下叶片数对复合式叶轮内流场的影响[J]. 机械工程学报, 2022, 58(14): 320-327.

NING Chao, YUAN Shouqi, LI Yalin, XU Hui, ZHENG Feng. Influence of Blade Numbers at the Same Cascade Density on the Characteristics of Composite Impeller[J]. Journal of Mechanical Engineering, 2022, 58(14): 320-327.

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相同叶栅稠密度下叶片数对复合式叶轮内流场的影响

Influence of Blade Numbers at the Same Cascade Density on the Characteristics of Composite Impeller

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