Vibration characteristics of self-priming jet flexible impeller

doi:10.16085/j.issn.1000-6613.2022-1176

Abstract

Abstract:

In order to study the effect of working conditions on the new self-priming jet flexible impeller, the mixing power consumption of agitator, stress distribution and vibration characteristics of impeller were analyzed by experiment and one-way fluid structure coupling numerical simulation. The results showed that the power criterion of the flexible Rushton impeller was 121.93% higher than that of the self-priming jet flexible impeller under the same operating conditions, and decreased with the increase of Reynolds number. The maximum stress of self-priming jet flexible impeller was lower than the allowable stress of the material within the scope of this study, located at the connection between the support and the blade. The natural frequency and vibration mode of self-priming jet flexible impeller were compared and analyzed under static modal and prestressed modal. The vibration modes with 1st to 8th order were the bending type and that with 9th to 12th order are the torsional type. Compared with static modal, the maximum deviation of natural frequency and vibration maximum value under the prestressed modal were 0.25% and 27.56%, respectively. The prestressed modal natural frequency increased with the increase of impeller rotational speed and the medium kinematic viscosity, but the increase ratio of same order natural frequency was little. The strength and stability of the self-priming jet flexible impeller under various working conditions can be guaranteed, and the mixing efficiency can be effectively improved. The advantage of self-priming jet flexible impeller was obviously in mixing efficiency. This study provided the basic data for the strength and stability of the impeller under various working conditions.

Key words: self-priming jet, stirred vessel, vibration characteristics, numerical simulation, modal analysis, hydrodynamics

摘要：

为了研究工况对新型自吸射流柔性搅拌桨的影响，运用实验和单向流固耦合数值模拟分析了装置的搅拌功耗、搅拌桨应力分布和振动特性。结果表明，相同工况下柔性Rushton搅拌桨的功率准数比自吸射流柔性搅拌桨高121.93%，并随Reynolds数的提高而减小。自吸射流柔性搅拌桨在支架与桨叶连接处应力最高，在本文研究范围内最大应力低于材料的许用应力。对自吸射流柔性搅拌桨在静模态和预应力模态下的固有频率和振型进行对比分析，两种模态前8阶为弯曲型，后4阶为扭变型；与静模态相比，预应力模态下固有频率和振型最大值的最大偏差分别为0.25%和27.56%。随着搅拌桨的转速和介质运动黏度提高，搅拌桨预应力模态固有频率增大，但同阶固有频率增长比变化较小。自吸射流柔性搅拌桨搅拌效率优势明显，本研究为多种工况下搅拌桨的强度和稳定性提供基础数据。

关键词: 自吸射流, 搅拌容器, 振动特性, 数值模拟, 模态分析, 流体动力学

CLC Number:

TQ027

ZHANG Chengsong, ZHANG Jing, GONG Bin, LI Mingyang, YUAN Jiaxin, LI Hongye. Vibration characteristics of self-priming jet flexible impeller[J]. Chemical Industry and Engineering Progress, 2023, 42(4): 1728-1738.

张成松, 张静, 龚斌, 李明洋, 袁佳新, 李宏业. 自吸射流柔性搅拌桨振动特性[J]. 化工进展, 2023, 42(4): 1728-1738.

Figures/Tables 18

References 36

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流体介质	介质运动黏度ν/m²·s^-1	搅拌转速N/r·min^-1	雷诺数Re
水	1.005×10^-6	60~300	22392~111962
甘油质量分数70%	1.943×10^-5	120，240	2316.1，4632.1
甘油质量分数80%	4.958×10^-5	120	907.71
甘油质量分数90%	1.771×10^-4	120	254.13
甘油质量分数100%	1.118×10^-3	120	40.261

流体介质	介质运动黏度ν/m²·s^-1	搅拌转速N/r·min^-1	雷诺数Re
水	1.005×10^-6	60~300	22392~111962
甘油质量分数70%	1.943×10^-5	120，240	2316.1，4632.1
甘油质量分数80%	4.958×10^-5	120	907.71
甘油质量分数90%	1.771×10^-4	120	254.13
甘油质量分数100%	1.118×10^-3	120	40.261

阶数	f_d/Hz	f_w/Hz	[(f_w-f_d)/f_d]/%
第1阶	81.086	81.125	0.05
第2阶	81.094	81.192	0.12
第3阶	81.106	81.218	0.14
第4阶	81.129	81.283	0.19
第5阶	88.855	88.975	0.14
第6阶	88.889	89.098	0.24
第7阶	88.894	89.100	0.23
第8阶	88.912	89.131	0.25
第9阶	217.980	217.970	-0.01
第10阶	218.200	218.250	0.02
第11阶	220.100	220.080	-0.01
第12阶	220.350	220.430	0.04

阶数	f_d/Hz	f_w/Hz	[(f_w-f_d)/f_d]/%
第1阶	81.086	81.125	0.05
第2阶	81.094	81.192	0.12
第3阶	81.106	81.218	0.14
第4阶	81.129	81.283	0.19
第5阶	88.855	88.975	0.14
第6阶	88.889	89.098	0.24
第7阶	88.894	89.100	0.23
第8阶	88.912	89.131	0.25
第9阶	217.980	217.970	-0.01
第10阶	218.200	218.250	0.02
第11阶	220.100	220.080	-0.01
第12阶	220.350	220.430	0.04

阶数	A_d/mm	A_w/mm	[(A_w-A_d)/A_d]/%
第1阶	1488.40	1689.30	13.50
第2阶	1334.20	1634.20	22.49
第3阶	1274.80	1626.10	27.56
第4阶	1380.00	1680.80	21.80
第5阶	1714.40	1714.40	0.00
第6阶	1554.70	1712.30	10.14
第7阶	1554.70	1714.90	10.30
第8阶	1714.60	1712.60	-0.12
第9阶	923.00	885.68	-4.04
第10阶	837.02	870.17	3.96
第11阶	878.82	882.53	0.42
第12阶	801.12	866.16	8.12