Clearance leakage flow characteristics in mechatronic axial flow pump

YANG Congxin; MO Yingxiang; GUO Yanlei; ZHAO Sen

doi:10.11975/j.issn.1002-6819.202307243

Volume 39 Issue 23

Dec. 2023

Turn off MathJax

Article Contents

Abstract

References

Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE) > 2023 > 39(23): 36-44. > DOI: 10.11975/j.issn.1002-6819.202307243

YANG Congxin, MO Yingxiang, GUO Yanlei, et al. Clearance leakage flow characteristics in mechatronic axial flow pump[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2023, 39(23): 36-44. DOI: 10.11975/j.issn.1002-6819.202307243

Citation:

PDF (3120 KB)

Clearance leakage flow characteristics in mechatronic axial flow pump

YANG Congxin^{1, 2,},
MO Yingxiang¹,
GUO Yanlei^{1, 2},
ZHAO Sen¹

1.
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
Key Laboratory of Fluid Machinery and System, Gansu Province, Lanzhou 730050, China

More Information

Received Date: July 25, 2023
Revised Date: December 01, 2023
Available Online: January 29, 2024

Graphical Abstract

Abstract

Abstract

A mechatronic axial pump has been widely used for the energy-saving machinery in sustainable agriculture. This study aims to explore the influence of the clearance leakage on the flow field structure in the mechatronic axial pump. The RNG k-ε turbulence model was also utilized to carry out the transient numerical simulation using ANSYS CFX software. The full flow field of the pump was then obtained in the different flow conditions (1 674~2 510 m³/h). Specifically, a systematic analysis was implemented on the pump pressure, turbulent kinetic energy, and vortex volume field distribution. Radial velocity and impeller efficiency were determined to establish the relationship between rotor friction loss and leakage with the flow rate. The leakage flow was finally clarified in the flow fields of mechatronic axial pump. The results show that the special structure of the stator-rotor clearance part was dominated in the efficiency of the whole mechatronic axial flow pump, compared with the traditional. The main reason was that the operating torque of the stator and rotor was greatly contributed to the friction loss power of the rotor and the total shaft power. 19.1% of the pump shaft power was accounted for the mechanical friction loss power on the outer wall of the rotor at rated operating point. There was the increase in the proportion with the increasing flow rate. The leakage and backflow of the clearance and the mixing effect in the main flow area of the blade were extend the low flow pattern to the main flow area of the internal flow channel of the impeller, thus reducing the operating efficiency of the pump. Therefore, the collaborative design of the motor and impeller was required for the energy saving in the mechatronic axial flow pump, in order to minimize the power lost from the rotor friction and then meet the requirements of hydraulic performance. There was the fluid flow through the motor stator-rotor clearance leakage back to the impeller inlet, the formation of jets, the localized area of high turbulent kinetic energy, strong vorticity, and high radial velocity near the edge wall of the impeller inlet. The inflow conditions were seriously disturbed to increase the hydraulic loss for the low efficiency, such as the uniform inflow at the impeller inlet and the assumption of cylinder independence. The closer to the wheel flange position was, the greater the effect was. A mutually constraining and promoting relationship was formed in the leakage and return flow velocity, as well as the pressure difference between the inlet and outlet of the return flow. Importantly, this relationship was also determined as the internal characteristics of the leakage and returns between the stator and rotor clearances of the pump. At the same time, the amount of leakage, the size and degree of influence of the leakage on the flow field structure were negatively correlated with the flow rate. The leakage flow rate of clearance was reduced to minimize the damage to the flow field at the impeller inlet. The finding can provide a strong reference to improve the performance of mechatronic axial flow pumps.
- axial pump,
- numerical simulation,
- leakage flow,
- mechatronics,
- transient characteristics

FullText(HTML)

References (32)

References

[1]	朱国俊,唐振博,冯建军,等. 启动方式对混流泵噪声特性的影响[J]. 农业工程学报,2023,39(13):34-42. doi: 10.11975/j.issn.1002-6819.202304091 ZHU Guojun, TANG Zhenbo, FENG Jianjun, et al. Influences of start-up mode on the noise characteristics of mixed-flow pump[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2023, 39(13): 34-42. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.202304091
[2]	焦海峰,陈正国,王文,等. 全贯流泵在停机过渡过程中的水力特性研究[J]. 农业机械学报,2023,54(9):236-245. doi: 10.6041/j.issn.1000-1298.2023.09.023 JIAO Haifeng, CHEN Zhengguo, WANG Wen, et al. Hydraulic characteristics of a total flow pump during shutdown transition[J]. Transactions of the Chinese Society for Agricultural Machinery, 2023, 54(9): 236-245. (in Chinese with English abstract) doi: 10.6041/j.issn.1000-1298.2023.09.023
[3]	ZHU H, BO G, ZHOU Y, et al. Pump selection and performance prediction for the technical innovation of an axial flow pump station[J]. Mathematical Problems in Engineering, 2018, 2018: 1-9.
[4]	夏臣智,成立,蒋红樱,等. 潜水贯流泵装置过流部件水力性能分析与优化[J]. 农业工程学报,2018,34(7):45-51. doi: 10.11975/j.issn.1002-6819.2018.07.006 XIA Chenzhi, CHENG Li, JIANG Hongying, et al. Hydraulic performance analysis and optimization on flow passage components of diving tubular pumping system[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2018, 34(7): 45-51. (in Chinese with English abstract). doi: 10.11975/j.issn.1002-6819.2018.07.006
[5]	陆伟刚,王东伟,施伟,等. 电动机前置和电动机后置潜水贯流泵装置水力性能比较[J]. 排灌机械工程学报,2020,38(4):325-331. LU Weigang, WANG Dongwei, SHI Wei, et al. Comparison of hydraulic performance of submersible cross-flow pumping device with motor front and motor rear[J]. Journal of Irrigation and Drainage Machinery Engineering, 2020, 38(4): 325-331. (in Chinese with English abstract)
[6]	SUN Z, YU J, TANG F. The influence of bulb position on hydraulic performance of submersible tubular pump device[J]. Journal of Marine Science and Engineering, 2021, 9(8): 831. doi: 10.3390/jmse9080831
[7]	SHI L, YUAN Y, JIAO H, et al. Numerical investigation and experiment on pressure pulsation characteristics in a full tubular pump[J]. Renewable Energy, 2021, 163: 987-1000. doi: 10.1016/j.renene.2020.09.003
[8]	张德胜,石磊,陈健,等. 基于大涡模拟的轴流泵叶顶泄漏涡瞬态特性分析[J]. 农业工程学报,2015,31(11):74-80. doi: 10.11975/j.issn.1002-6819.2015.11.011 ZHANG Desheng, SHI Lei, CHEN Jian, et al. Analysis on transient characteristics of tip leakage vortex in axial flow pump using large eddy simulation[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2015, 31(11): 74-80. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.2015.11.011
[9]	SHI L, ZHANG W, JIAO H, et al. Numerical simulation and experimental study on the comparison of the hydraulic characteristics of an axial-flow pump and a full tubular pump[J]. Renewable Energy, 2020, 153: 1455-1464. doi: 10.1016/j.renene.2020.02.082
[10]	MENG F, LI Y, PEI J. Energy characteristics of full tubular pump device with different backflow clearances based on entropy production[J]. Applied Sciences-Basel, 2021, 11(8): 3376. doi: 10.3390/app11083376
[11]	朱军,付玲玲,石丽建,等. 间隙回流角度对全贯流泵水力性能的影响[J]. 中国农村水利水电,2020(9):53-57. doi: 10.3969/j.issn.1007-2284.2020.09.010
[12]	石丽建,焦海峰,苟金澜,等. 全贯流泵回流间隙对泵水力性能的影响[J]. 农业机械学报,2020,51(4):139-146. doi: 10.6041/j.issn.1000-1298.2020.04.016 SHI Lijian, JIAO Haifeng, GOU Jinlan, et al. Influence of backflow gap size on hydraulic performance of full-flow pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2020, 51(4): 139-146. (in Chinese with English abstract) doi: 10.6041/j.issn.1000-1298.2020.04.016
[13]	SHEN S, QIAN Z, JI B, et al. Numerical investigation of tip flow dynamics and main flow characteristics with varying tip clearance widths for an axial-flow pump[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2019, 233(4): 476-488.
[14]	YOU D, WANG M, MOIN P, et al. Large-eddy simulation analysis of mechanisms for viscous losses in a turbomachinery tip-clearance flow[J]. Journal of Fluid Mechanics, 2007, 586: 177-204. doi: 10.1017/S0022112007006842
[15]	DECAIX J, BALARAC G, DREYER M, et al. RANS and LES computations of the tip-leakage vortex for different gap widths[J]. Journal of Turbulence, 2015, 16: 309-341. doi: 10.1080/14685248.2014.984068
[16]	XU H, JIN D, SUN D, et al. Effect of rotor-stator axial spacing on the pressure-rise performance and flow field in an axial pump[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2019, 233(6): 727-737.
[17]	黎耀军,沈金峰,洪益平,等. 叶顶间隙对轴流泵轮缘压力脉动影响的数值预测[J]. 农业机械学报,2014,45(5):59-64. LI Yaojun, SHEN Jinfeng, HONG Yiping, et al. Numerical investigation of pressure fluctuations on axial-flow pump blades affected by tip-gap size[J]. Transactions of the Chinese Society for Agricultural Machinery, 2014, 45(5): 59-64. (in Chinese with English abstract)
[18]	黎义斌,胡鹏林,李仁年,等. 不同叶顶间隙对斜流泵性能影响的数值分析[J]. 农业工程学报,2014,30(23):86-93. doi: 10.3969/j.issn.1002-6819.2014.23.012 LI Yibin, HU Penglin, LI Rennian, et al. Numerical analysis for effects of different blade tip clearance on performance in mixed-flow pump[J]. Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE), 2014, 30(23): 86-93. (in Chinese with English abstract) doi: 10.3969/j.issn.1002-6819.2014.23.012
[19]	闫龙龙,高波,张宁,等. 基于Omega涡识别方法的诱导轮内非定常空化流动分析[J]. 工程热物理学报,2023,44(3):654-659. YAN Longlong, GAO Bo, ZHANG Ning, et al. Analysis of non-constant cavitation flow in induced wheel based on Omega vortex identification method[J]. Journal of Engineering Thermophysics, 2023, 44(3): 654-659. (in Chinese with English abstract)
[20]	ZHAO W G, ZHAO G S. Numerical investigation on the transient characteristics of sediment-laden two-phase flow in a centrifugal pump[J]. Journal of Mechanical Science and Technology, 2018, 32(1): 167-176. doi: 10.1007/s12206-017-1218-6
[21]	苗森春,罗文,王晓晖,等. 双吸泵作液力透平时叶轮内部能量损失机理分析[J]. 农业工程学报,2022,38(22):12-22. doi: 10.11975/j.issn.1002-6819.2022.22.002 MIAO Senchun, LUO Wen, WANG Xiaohui, et al. Impeller internal energy loss mechanism for a double-suction pump as the turbine[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(22): 12-22. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.2022.22.002
[22]	蒋丽珠,邓成发,童利成. 压坡渐扩式出口泄洪洞水力特性数值计算分析[J]. 浙江水利科技,2023,51(5):39-43.
[23]	陈伟威. 基于RNG k- ε紊流模型的溢洪道水力特性数值模拟[J]. 水利科学与寒区工程,2023,6(1):10-13. doi: 10.3969/j.issn.2096-5419.2023.01.004
[24]	孙壮壮,王林,葛恒军,等. 大型潜水贯流泵装置叶片区压力脉动试验[J]. 农业机械学报,2023,54(4):155-160. doi: 10.6041/j.issn.1000-1298.2023.04.014 SUN Zhuangzhuang, WANG Lin, GE Hengjun, et al. Experiment on pressure pulsation in impeller of large submersible tubular pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2023, 54(4): 155-160. (in Chinese with English abstract) doi: 10.6041/j.issn.1000-1298.2023.04.014
[25]	孙壮壮,于杰,葛恒君,等. 带可调导叶的双向潜水贯流泵装置水力性能[J]. 农业工程学报,2022,38(4):42-50. doi: 10.11975/j.issn.1002-6819.2022.04.005 SUN Zhuangzhuang, YU Jie, GE Hengjun, et al. Hydraulic performance of the bidirectional submersible tubular pump with adjustable guide vanes[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(4): 42-50. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.2022.04.005
[26]	NI D, YANG M, GAO B, et al. Experimental and numerical investigation on the pressure pulsation and instantaneous flow structure in a nuclear reactor coolant pump[J]. Nuclear Engineering and Design, 2018, 337: 261-270. doi: 10.1016/j.nucengdes.2018.07.014
[27]	王凯,柳涵宇,王李科,等. 颗粒体积浓度对半开式叶轮离心泵泄漏涡和磨损的影响[J]. 农业工程学报,2023,39(16):44-53. doi: 10.11975/j.issn.1002-6819.202305243 WANG Kai, LIU Hanyu, WANG Like, et al. Effects of particle volume concentration on the leakage vortex and erosion characteristics of semi-open centrifugal pumps[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2023, 39(16): 44-53. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.202305243
[28]	李金琼. 基于粗糙度的离心泵气液两相流机理的研究[D]. 成都:西华大学2020. LI Jinqiong. Study on Gas-liquid Two-phase Flow Mechanism of Centrifugal Pump Based on Roughness[D]. Chengdu: Xihua University, 2020. (in Chinese with English abstract
[29]	王福军. 水泵与泵站流动分析方法[M]. 北京:中国水利水电出版社,2020:53.
[30]	李盼,曹丽华,孟宾,等. 汽轮机叶顶汽封间隙泄漏涡动特性研究[J]. 润滑与密封,2019,44(10):32-36. doi: 10.3969/j.issn.0254-0150.2019.10.005 LI Pan, CAO Lihua, MENG Bin, et al. Research on vortex characteristics of clearance leakage of Steam turbine tip seal[J]. Lubrication & Sealing, 2019, 44(10): 32-36. (in Chinese with English abstract) doi: 10.3969/j.issn.0254-0150.2019.10.005
[31]	赵伟国,秦嘉伟,田向福,等. 基于座头鲸“结节效应”的仿生离心泵空化特性[J]. 农业工程学报,2022,38(12):23-31. doi: 10.11975/j.issn.1002-6819.2022.12.003 ZHAO Weiguo, QIN Jiawei, TIAN Xiangfu, et al. Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(12): 23-31. (in Chinese with English abstract) doi: 10.11975/j.issn.1002-6819.2022.12.003
[32]	LIU C, GAO Y, DONG X, et al. Third generation of vortex identification methods: Omega and Liutex /Rortex based systems[J]. Journal of Hydrodynamics, 2019, 31(2): 205-223.